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FTPClient.javaAPI DocApache Commons NET 1.4.1 API119554Sat Dec 03 10:05:50 GMT 2005org.apache.commons.net.ftp

FTPClient

public class FTPClient extends FTP implements Configurable
FTPClient encapsulates all the functionality necessary to store and retrieve files from an FTP server. This class takes care of all low level details of interacting with an FTP server and provides a convenient higher level interface. As with all classes derived from {@link org.apache.commons.net.SocketClient}, you must first connect to the server with {@link org.apache.commons.net.SocketClient#connect connect } before doing anything, and finally {@link org.apache.commons.net.SocketClient#disconnect disconnect } after you're completely finished interacting with the server. Then you need to check the FTP reply code to see if the connection was successful. For example:
boolean error = false;
try {
int reply;
ftp.connect("ftp.foobar.com");
System.out.println("Connected to " + server + ".");
System.out.print(ftp.getReplyString());

// After connection attempt, you should check the reply code to verify
// success.
reply = ftp.getReplyCode();

if(!FTPReply.isPositiveCompletion(reply)) {
ftp.disconnect();
System.err.println("FTP server refused connection.");
System.exit(1);
}
... // transfer files
ftp.logout();
} catch(IOException e) {
error = true;
e.printStackTrace();
} finally {
if(ftp.isConnected()) {
try {
ftp.disconnect();
} catch(IOException ioe) {
// do nothing
}
}
System.exit(error ? 1 : 0);
}

Immediately after connecting is the only real time you need to check the reply code (because connect is of type void). The convention for all the FTP command methods in FTPClient is such that they either return a boolean value or some other value. The boolean methods return true on a successful completion reply from the FTP server and false on a reply resulting in an error condition or failure. The methods returning a value other than boolean return a value containing the higher level data produced by the FTP command, or null if a reply resulted in an error condition or failure. If you want to access the exact FTP reply code causing a success or failure, you must call {@link org.apache.commons.net.ftp.FTP#getReplyCode getReplyCode } after a success or failure.

The default settings for FTPClient are for it to use FTP.ASCII_FILE_TYPE , FTP.NON_PRINT_TEXT_FORMAT , FTP.STREAM_TRANSFER_MODE , and FTP.FILE_STRUCTURE . The only file types directly supported are FTP.ASCII_FILE_TYPE and FTP.IMAGE_FILE_TYPE (which is the same as FTP.BINARY_FILE_TYPE ). Because there are at lest 4 different EBCDIC encodings, we have opted not to provide direct support for EBCDIC. To transfer EBCDIC and other unsupported file types you must create your own filter InputStreams and OutputStreams and wrap them around the streams returned or required by the FTPClient methods. FTPClient uses the {@link ToNetASCIIOutputStream NetASCII} filter streams to provide transparent handling of ASCII files. We will consider incorporating EBCDIC support if there is enough demand.

FTP.NON_PRINT_TEXT_FORMAT , FTP.STREAM_TRANSFER_MODE , and FTP.FILE_STRUCTURE are the only supported formats, transfer modes, and file structures.

Because the handling of sockets on different platforms can differ significantly, the FTPClient automatically issues a new PORT command prior to every transfer requiring that the server connect to the client's data port. This ensures identical problem-free behavior on Windows, Unix, and Macintosh platforms. Additionally, it relieves programmers from having to issue the PORT command themselves and dealing with platform dependent issues.

Additionally, for security purposes, all data connections to the client are verified to ensure that they originated from the intended party (host and port). If a data connection is initiated by an unexpected party, the command will close the socket and throw an IOException. You may disable this behavior with {@link #setRemoteVerificationEnabled setRemoteVerificationEnabled()}.

You should keep in mind that the FTP server may choose to prematurely close a connection if the client has been idle for longer than a given time period (usually 900 seconds). The FTPClient class will detect a premature FTP server connection closing when it receives a {@link org.apache.commons.net.ftp.FTPReply#SERVICE_NOT_AVAILABLE FTPReply.SERVICE_NOT_AVAILABLE } response to a command. When that occurs, the FTP class method encountering that reply will throw an {@link org.apache.commons.net.ftp.FTPConnectionClosedException} . FTPConnectionClosedException is a subclass of IOException and therefore need not be caught separately, but if you are going to catch it separately, its catch block must appear before the more general IOException catch block. When you encounter an {@link org.apache.commons.net.ftp.FTPConnectionClosedException} , you must disconnect the connection with {@link #disconnect disconnect() } to properly clean up the system resources used by FTPClient. Before disconnecting, you may check the last reply code and text with {@link org.apache.commons.net.ftp.FTP#getReplyCode getReplyCode }, {@link org.apache.commons.net.ftp.FTP#getReplyString getReplyString }, and {@link org.apache.commons.net.ftp.FTP#getReplyStrings getReplyStrings}. You may avoid server disconnections while the client is idle by periodicaly sending NOOP commands to the server.

Rather than list it separately for each method, we mention here that every method communicating with the server and throwing an IOException can also throw a {@link org.apache.commons.net.MalformedServerReplyException} , which is a subclass of IOException. A MalformedServerReplyException will be thrown when the reply received from the server deviates enough from the protocol specification that it cannot be interpreted in a useful manner despite attempts to be as lenient as possible.

Listing API Examples Both paged and unpaged examples of directory listings are available, as follows:

Unpaged (whole list) access, using a parser accessible by auto-detect:

FTPClient f=FTPClient();
f.connect(server);
f.login(username, password);
FTPFile[] files = listFiles(directory);

Paged access, using a parser not accessible by auto-detect. The class defined in the first parameter of initateListParsing should be derived from org.apache.commons.net.FTPFileEntryParser:

FTPClient f=FTPClient();
f.connect(server);
f.login(username, password);
FTPListParseEngine engine =
f.initiateListParsing("com.whatever.YourOwnParser", directory);

while (engine.hasNext()) {
FTPFile[] files = engine.getNext(25); // "page size" you want
//do whatever you want with these files, display them, etc.
//expensive FTPFile objects not created until needed.
}

Paged access, using a parser accessible by auto-detect:

FTPClient f=FTPClient();
f.connect(server);
f.login(username, password);
FTPListParseEngine engine = f.initiateListParsing(directory);

while (engine.hasNext()) {
FTPFile[] files = engine.getNext(25); // "page size" you want
//do whatever you want with these files, display them, etc.
//expensive FTPFile objects not created until needed.
}

For examples of using FTPClient on servers whose directory listings

  • use languages other than English
  • use date formats other than the American English "standard" MM d yyyy
  • are in different timezones and you need accurate timestamps for dependency checking as in Ant
see {@link FTPClientConfig FTPClientConfig}.

NOTE: If you experience problems with unwanted firing of

setSoTimeout()
during periods of client inactivity, this can be alleviated by calling
setReaderThread(false)
. For more details, see this thread.

author
Daniel F. Savarese
see
FTP
see
FTPConnectionClosedException
see
FTPFileEntryParser
see
FTPFileEntryParserFactory
see
DefaultFTPFileEntryParserFactory
see
FTPClientConfig
see
org.apache.commons.net.MalformedServerReplyException

Fields Summary
public static final int
ACTIVE_LOCAL_DATA_CONNECTION_MODE
A constant indicating the FTP session is expecting all transfers to occur between the client (local) and server and that the server should connect to the client's data port to initiate a data transfer. This is the default data connection mode when and FTPClient instance is created.
public static final int
ACTIVE_REMOTE_DATA_CONNECTION_MODE
A constant indicating the FTP session is expecting all transfers to occur between two remote servers and that the server the client is connected to should connect to the other server's data port to initiate a data transfer.
public static final int
PASSIVE_LOCAL_DATA_CONNECTION_MODE
A constant indicating the FTP session is expecting all transfers to occur between the client (local) and server and that the server is in passive mode, requiring the client to connect to the server's data port to initiate a transfer.
public static final int
PASSIVE_REMOTE_DATA_CONNECTION_MODE
A constant indicating the FTP session is expecting all transfers to occur between two remote servers and that the server the client is connected to is in passive mode, requiring the other server to connect to the first server's data port to initiate a data transfer.
private int
__dataConnectionMode
private int
__dataTimeout
private int
__passivePort
private String
__passiveHost
private int
__fileType
private int
__fileFormat
private int
__fileStructure
private int
__fileTransferMode
private boolean
__remoteVerificationEnabled
private long
__restartOffset
private org.apache.commons.net.ftp.parser.FTPFileEntryParserFactory
__parserFactory
private int
__bufferSize
private String
__systemName
private FTPFileEntryParser
__entryParser
private FTPClientConfig
__configuration
Constructors Summary
public FTPClient()
Default FTPClient constructor. Creates a new FTPClient instance with the data connection mode set to ACTIVE_LOCAL_DATA_CONNECTION_MODE , the file type set to FTP.ASCII_FILE_TYPE , the file format set to FTP.NON_PRINT_TEXT_FORMAT , the file structure set to FTP.FILE_STRUCTURE , and the transfer mode set to FTP.STREAM_TRANSFER_MODE .


                                                             
     
    
        __initDefaults();
        __dataTimeout = -1;
        __remoteVerificationEnabled = true;
        __parserFactory = new DefaultFTPFileEntryParserFactory();
        __configuration      = null;
    
Methods Summary
private void__initDefaults()

        __dataConnectionMode = ACTIVE_LOCAL_DATA_CONNECTION_MODE;
        __passiveHost        = null;
        __passivePort        = -1;
        __fileType           = FTP.ASCII_FILE_TYPE;
        __fileStructure      = FTP.FILE_STRUCTURE;
        __fileFormat         = FTP.NON_PRINT_TEXT_FORMAT;
        __fileTransferMode   = FTP.STREAM_TRANSFER_MODE;
        __restartOffset      = 0;
        __systemName         = null;
        __entryParser        = null;
        __bufferSize 		 = Util.DEFAULT_COPY_BUFFER_SIZE;
    
private void__parsePassiveModeReply(java.lang.String reply)

        int i, index, lastIndex;
        String octet1, octet2;
        StringBuffer host;

        reply = reply.substring(reply.indexOf('(") + 1,
                                reply.indexOf(')")).trim();

        host = new StringBuffer(24);
        lastIndex = 0;
        index = reply.indexOf(',");
        host.append(reply.substring(lastIndex, index));

        for (i = 0; i < 3; i++)
        {
            host.append('.");
            lastIndex = index + 1;
            index = reply.indexOf(',", lastIndex);
            host.append(reply.substring(lastIndex, index));
        }

        lastIndex = index + 1;
        index = reply.indexOf(',", lastIndex);

        octet1 = reply.substring(lastIndex, index);
        octet2 = reply.substring(index + 1);

        // index and lastIndex now used as temporaries
        try
        {
            index = Integer.parseInt(octet1);
            lastIndex = Integer.parseInt(octet2);
        }
        catch (NumberFormatException e)
        {
            throw new MalformedServerReplyException(
                "Could not parse passive host information.\nServer Reply: " + reply);
        }

        index <<= 8;
        index |= lastIndex;

        __passiveHost = host.toString();
        __passivePort = index;
    
private java.lang.String__parsePathname(java.lang.String reply)

        int begin, end;

        begin = reply.indexOf('"") + 1;
        end = reply.indexOf('"", begin);

        return reply.substring(begin, end);
    
private boolean__storeFile(int command, java.lang.String remote, java.io.InputStream local)

        OutputStream output;
        Socket socket;

        if ((socket = _openDataConnection_(command, remote)) == null)
            return false;

        output = new BufferedOutputStream(socket.getOutputStream(),
                                          getBufferSize()
                                          );
        if (__fileType == ASCII_FILE_TYPE)
            output = new ToNetASCIIOutputStream(output);
        // Treat everything else as binary for now
        try
        {
            Util.copyStream(local, output, getBufferSize(),
                            CopyStreamEvent.UNKNOWN_STREAM_SIZE, null,
                            false);
        }
        catch (IOException e)
        {
            try
            {
                socket.close();
            }
            catch (IOException f)
            {}
            throw e;
        }
        output.close();
        socket.close();
        return completePendingCommand();
    
private java.io.OutputStream__storeFileStream(int command, java.lang.String remote)

        OutputStream output;
        Socket socket;

        if ((socket = _openDataConnection_(command, remote)) == null)
            return null;

        output = socket.getOutputStream();
        if (__fileType == ASCII_FILE_TYPE) {
          // We buffer ascii transfers because the buffering has to
          // be interposed between ToNetASCIIOutputSream and the underlying
          // socket output stream.  We don't buffer binary transfers
          // because we don't want to impose a buffering policy on the
          // programmer if possible.  Programmers can decide on their
          // own if they want to wrap the SocketOutputStream we return
          // for file types other than ASCII.
          output = new BufferedOutputStream(output,
                                            getBufferSize());
          output = new ToNetASCIIOutputStream(output);

        }
        return new org.apache.commons.net.io.SocketOutputStream(socket, output);
    
protected void_connectAction_()

        super._connectAction_();
        __initDefaults();
    
protected java.net.Socket_openDataConnection_(int command, java.lang.String arg)
Establishes a data connection with the FTP server, returning a Socket for the connection if successful. If a restart offset has been set with {@link #setRestartOffset(long)}, a REST command is issued to the server with the offset as an argument before establishing the data connection. Active mode connections also cause a local PORT command to be issued.

param
command The text representation of the FTP command to send.
param
arg The arguments to the FTP command. If this parameter is set to null, then the command is sent with no argument.
return
A Socket corresponding to the established data connection. Null is returned if an FTP protocol error is reported at any point during the establishment and initialization of the connection.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        Socket socket;

        if (__dataConnectionMode != ACTIVE_LOCAL_DATA_CONNECTION_MODE &&
                __dataConnectionMode != PASSIVE_LOCAL_DATA_CONNECTION_MODE)
            return null;

        if (__dataConnectionMode == ACTIVE_LOCAL_DATA_CONNECTION_MODE)
        {
            ServerSocket server;
            server = _socketFactory_.createServerSocket(0, 1, getLocalAddress());

            if (!FTPReply.isPositiveCompletion(port(getLocalAddress(),
                                                    server.getLocalPort())))
            {
                server.close();
                return null;
            }

            if ((__restartOffset > 0) && !restart(__restartOffset))
            {
                server.close();
                return null;
            }

            if (!FTPReply.isPositivePreliminary(sendCommand(command, arg)))
            {
                server.close();
                return null;
            }

            // For now, let's just use the data timeout value for waiting for
            // the data connection.  It may be desirable to let this be a
            // separately configurable value.  In any case, we really want
            // to allow preventing the accept from blocking indefinitely.
            if (__dataTimeout >= 0)
                server.setSoTimeout(__dataTimeout);
            socket = server.accept();
            server.close();
        }
        else
        { // We must be in PASSIVE_LOCAL_DATA_CONNECTION_MODE

            if (pasv() != FTPReply.ENTERING_PASSIVE_MODE)
                return null;

            __parsePassiveModeReply((String)_replyLines.elementAt(0));

            socket = _socketFactory_.createSocket(__passiveHost, __passivePort);
            if ((__restartOffset > 0) && !restart(__restartOffset))
            {
                socket.close();
                return null;
            }

            if (!FTPReply.isPositivePreliminary(sendCommand(command, arg)))
            {
                socket.close();
                return null;
            }
        }

        if (__remoteVerificationEnabled && !verifyRemote(socket))
        {
            InetAddress host1, host2;

            host1 = socket.getInetAddress();
            host2 = getRemoteAddress();

            socket.close();

            throw new IOException(
                "Host attempting data connection " + host1.getHostAddress() +
                " is not same as server " + host2.getHostAddress());
        }

        if (__dataTimeout >= 0)
            socket.setSoTimeout(__dataTimeout);

        return socket;
    
public booleanabort()
Abort a transfer in progress.

return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(abor());
    
public booleanallocate(int bytes)
Reserve a number of bytes on the server for the next file transfer.

param
bytes The number of bytes which the server should allocate.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(allo(bytes));
    
public booleanallocate(int bytes, int recordSize)
Reserve space on the server for the next file transfer.

param
bytes The number of bytes which the server should allocate.
param
recordSize The size of a file record.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(allo(bytes, recordSize));
    
public booleanappendFile(java.lang.String remote, java.io.InputStream local)
Appends to a file on the server with the given name, taking input from the given InputStream. This method does NOT close the given InputStream. If the current file type is ASCII, line separators in the file are transparently converted to the NETASCII format (i.e., you should not attempt to create a special InputStream to do this).

param
remote The name of the remote file.
param
local The local InputStream from which to read the data to be appended to the remote file.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
CopyStreamException If an I/O error occurs while actually transferring the file. The CopyStreamException allows you to determine the number of bytes transferred and the IOException causing the error. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return __storeFile(FTPCommand.APPE, remote, local);
    
public java.io.OutputStreamappendFileStream(java.lang.String remote)
Returns an OutputStream through which data can be written to append to a file on the server with the given name. If the current file type is ASCII, the returned OutputStream will convert line separators in the file to the NETASCII format (i.e., you should not attempt to create a special OutputStream to do this). You must close the OutputStream when you finish writing to it. The OutputStream itself will take care of closing the parent data connection socket upon being closed. To finalize the file transfer you must call {@link #completePendingCommand completePendingCommand } and check its return value to verify success.

param
remote The name of the remote file.
return
An OutputStream through which the remote file can be appended. If the data connection cannot be opened (e.g., the file does not exist), null is returned (in which case you may check the reply code to determine the exact reason for failure).
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return __storeFileStream(FTPCommand.APPE, remote);
    
public booleanchangeToParentDirectory()
Change to the parent directory of the current working directory.

return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(cdup());
    
public booleanchangeWorkingDirectory(java.lang.String pathname)
Change the current working directory of the FTP session.

param
pathname The new current working directory.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(cwd(pathname));
    
public booleancompletePendingCommand()
There are a few FTPClient methods that do not complete the entire sequence of FTP commands to complete a transaction. These commands require some action by the programmer after the reception of a positive intermediate command. After the programmer's code completes its actions, it must call this method to receive the completion reply from the server and verify the success of the entire transaction.

For example,

InputStream input;
OutputStream output;
input = new FileInputStream("foobaz.txt");
output = ftp.storeFileStream("foobar.txt")
if(!FTPReply.isPositiveIntermediate(ftp.getReplyCode())) {
input.close();
output.close();
ftp.logout();
ftp.disconnect();
System.err.println("File transfer failed.");
System.exit(1);
}
Util.copyStream(input, output);
input.close();
output.close();
// Must call completePendingCommand() to finish command.
if(!ftp.completePendingCommand()) {
ftp.logout();
ftp.disconnect();
System.err.println("File transfer failed.");
System.exit(1);
}

return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(getReply());
    
public voidconfigure(FTPClientConfig config)
Implementation of the {@link Configurable Configurable} interface. In the case of this class, configuring merely makes the config object available for the factory methods that construct parsers.

param
config {@link FTPClientConfig FTPClientConfig} object used to provide non-standard configurations to the parser.
since
1.4

    	this.__configuration = config;
    
public FTPFileListcreateFileList(FTPFileEntryParser parser)
Using a programmer specified FTPFileEntryParser , initialize an object containing a raw file information for the current working directory. This information is obtained through the LIST command. This object is then capable of being iterated to return a sequence of FTPFile objects with information filled in by the FTPFileEntryParser used.

The server may or may not expand glob expressions. You should avoid using glob expressions because the return format for glob listings differs from server to server and will likely cause this method to fail.

This method differs from using the listFiles() methods in that expensive FTPFile objects are not created until needed which may be an advantage on large lists.

param
parser The FTPFileEntryParser that should be used to parse each server file listing.
return
An iteratable object that holds the raw information and is capable of providing parsed FTPFile objects, one for each file containing information contained in the given path in the format determined by the parser parameter. Null will be returned if a data connection cannot be opened. If the current working directory contains no files, an empty array will be the return.
FTPClient f=FTPClient();
f.connect(server);
f.login(username, password);
FTPFileList list = f.createFileList(directory, parser);
FTPFileIterator iter = list.iterator();

while (iter.hasNext()) {
FTPFile[] files = iter.getNext(25); // "page size" you want
//do whatever you want with these files, display them, etc.
//expensive FTPFile objects not created until needed.
}
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
deprecated
- use initiateListParsing(FTPFileEntryParser) method instead.
see
FTPFileList

        return createFileList(null, parser);
    
public FTPFileListcreateFileList(java.lang.String pathname, FTPFileEntryParser parser)
Using a programmer specified FTPFileEntryParser , initialize an object containing a raw file information for a directory or information for a single file. This information is obtained through the LIST command. This object is then capable of being iterated to return a sequence of FTPFile objects with information filled in by the FTPFileEntryParser used. The server may or may not expand glob expressions. You should avoid using glob expressions because the return format for glob listings differs from server to server and will likely cause this method to fail.

param
parser The FTPFileEntryParser that should be used to parse each server file listing.
param
pathname The file or directory to list.
return
An iteratable object that holds the raw information and is capable of providing parsed FTPFile objects, one for each file containing information contained in the given path in the format determined by the parser parameter. Null will be returned if a data connection cannot be opened. If the supplied path contains no files, an empty array will be the return.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
deprecated
- use initiateListParsing(String, FTPFileEntryParser) method instead.
see
FTPFileList

        Socket socket;

        if ((socket = _openDataConnection_(FTPCommand.LIST, pathname)) == null)
        {
            return null;
        }

        FTPFileList list = FTPFileList.create(socket.getInputStream(), parser);

        socket.close();

        completePendingCommand();
        return list;
    
public booleandeleteFile(java.lang.String pathname)
Deletes a file on the FTP server.

param
pathname The pathname of the file to be deleted.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(dele(pathname));
    
public voiddisconnect()
Closes the connection to the FTP server and restores connection parameters to the default values.

exception
IOException If an error occurs while disconnecting.

        super.disconnect();
        __initDefaults();
    
public voidenterLocalActiveMode()
Set the current data connection mode to ACTIVE_LOCAL_DATA_CONNECTION_MODE. No communication with the FTP server is conducted, but this causes all future data transfers to require the FTP server to connect to the client's data port. Additionally, to accommodate differences between socket implementations on different platforms, this method causes the client to issue a PORT command before every data transfer.

        __dataConnectionMode = ACTIVE_LOCAL_DATA_CONNECTION_MODE;
        __passiveHost = null;
        __passivePort = -1;
    
public voidenterLocalPassiveMode()
Set the current data connection mode to PASSIVE_LOCAL_DATA_CONNECTION_MODE . Use this method only for data transfers between the client and server. This method causes a PASV command to be issued to the server before the opening of every data connection, telling the server to open a data port to which the client will connect to conduct data transfers. The FTPClient will stay in PASSIVE_LOCAL_DATA_CONNECTION_MODE until the mode is changed by calling some other method such as {@link #enterLocalActiveMode enterLocalActiveMode() }

        __dataConnectionMode = PASSIVE_LOCAL_DATA_CONNECTION_MODE;
        // These will be set when just before a data connection is opened
        // in _openDataConnection_()
        __passiveHost = null;
        __passivePort = -1;
    
public booleanenterRemoteActiveMode(java.net.InetAddress host, int port)
Set the current data connection mode to ACTIVE_REMOTE_DATA_CONNECTION . Use this method only for server to server data transfers. This method issues a PORT command to the server, indicating the other server and port to which it should connect for data transfers. You must call this method before EVERY server to server transfer attempt. The FTPClient will NOT automatically continue to issue PORT commands. You also must remember to call {@link #enterLocalActiveMode enterLocalActiveMode() } if you wish to return to the normal data connection mode.

param
host The passive mode server accepting connections for data transfers.
param
port The passive mode server's data port.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (FTPReply.isPositiveCompletion(port(host, port)))
        {
            __dataConnectionMode = ACTIVE_REMOTE_DATA_CONNECTION_MODE;
            __passiveHost = null;
            __passivePort = -1;
            return true;
        }
        return false;
    
public booleanenterRemotePassiveMode()
Set the current data connection mode to PASSIVE_REMOTE_DATA_CONNECTION_MODE . Use this method only for server to server data transfers. This method issues a PASV command to the server, telling it to open a data port to which the active server will connect to conduct data transfers. You must call this method before EVERY server to server transfer attempt. The FTPClient will NOT automatically continue to issue PASV commands. You also must remember to call {@link #enterLocalActiveMode enterLocalActiveMode() } if you wish to return to the normal data connection mode.

return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (pasv() != FTPReply.ENTERING_PASSIVE_MODE)
            return false;

        __dataConnectionMode = PASSIVE_REMOTE_DATA_CONNECTION_MODE;
        __parsePassiveModeReply((String)_replyLines.elementAt(0));

        return true;
    
public intgetBufferSize()
Retrieve the current internal buffer size.

return
The current buffer size.

    	return __bufferSize;
    
public intgetDataConnectionMode()
Returns the current data connection mode (one of the _DATA_CONNECTION_MODE constants.

return
The current data connection mode (one of the _DATA_CONNECTION_MODE constants.

        return __dataConnectionMode;
    
public java.lang.StringgetPassiveHost()
Returns the hostname or IP address (in the form of a string) returned by the server when entering passive mode. If not in passive mode, returns null. This method only returns a valid value AFTER a data connection has been opened after a call to {@link #enterLocalPassiveMode enterLocalPassiveMode()}. This is because FTPClient sends a PASV command to the server only just before opening a data connection, and not when you call {@link #enterLocalPassiveMode enterLocalPassiveMode()}.

return
The passive host name if in passive mode, otherwise null.

        return __passiveHost;
    
public intgetPassivePort()
If in passive mode, returns the data port of the passive host. This method only returns a valid value AFTER a data connection has been opened after a call to {@link #enterLocalPassiveMode enterLocalPassiveMode()}. This is because FTPClient sends a PASV command to the server only just before opening a data connection, and not when you call {@link #enterLocalPassiveMode enterLocalPassiveMode()}.

return
The data port of the passive server. If not in passive mode, undefined.

        return __passivePort;
    
public longgetRestartOffset()
Fetches the restart offset.

return
offset The offset into the remote file at which to start the next file transfer.

        return __restartOffset;
    
public java.lang.StringgetStatus()
Issue the FTP STAT command to the server.

return
The status information returned by the server.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (FTPReply.isPositiveCompletion(stat()))
            return getReplyString();
        return null;
    
public java.lang.StringgetStatus(java.lang.String pathname)
Issue the FTP STAT command to the server for a given pathname. This should produce a listing of the file or directory.

return
The status information returned by the server.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (FTPReply.isPositiveCompletion(stat(pathname)))
            return getReplyString();
        return null;
    
public java.lang.StringgetSystemName()
Fetches the system type name from the server and returns the string. This value is cached for the duration of the connection after the first call to this method. In other words, only the first time that you invoke this method will it issue a SYST command to the FTP server. FTPClient will remember the value and return the cached value until a call to disconnect.

return
The system type name obtained from the server. null if the information could not be obtained.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

      //if (syst() == FTPReply.NAME_SYSTEM_TYPE)
      // Technically, we should expect a NAME_SYSTEM_TYPE response, but
      // in practice FTP servers deviate, so we soften the condition to
      // a positive completion.
        if (__systemName == null && FTPReply.isPositiveCompletion(syst()))
            __systemName = ((String)_replyLines.elementAt(0)).substring(4);

        return __systemName;
    
public FTPListParseEngineinitiateListParsing()
Using the default autodetect mechanism, initialize an FTPListParseEngine object containing a raw file information for the current working directory on the server This information is obtained through the LIST command. This object is then capable of being iterated to return a sequence of FTPFile objects with information filled in by the FTPFileEntryParser used.

This method differs from using the listFiles() methods in that expensive FTPFile objects are not created until needed which may be an advantage on large lists.

return
A FTPListParseEngine object that holds the raw information and is capable of providing parsed FTPFile objects, one for each file containing information contained in the given path in the format determined by the parser parameter. Null will be returned if a data connection cannot be opened. If the current working directory contains no files, an empty array will be the return.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
exception
ParserInitializationException Thrown if the autodetect mechanism cannot resolve the type of system we are connected with.
see
FTPListParseEngine

        return initiateListParsing((String) null);
    
public FTPListParseEngineinitiateListParsing(java.lang.String pathname)
Using the default autodetect mechanism, initialize an FTPListParseEngine object containing a raw file information for the supplied directory. This information is obtained through the LIST command. This object is then capable of being iterated to return a sequence of FTPFile objects with information filled in by the FTPFileEntryParser used.

The server may or may not expand glob expressions. You should avoid using glob expressions because the return format for glob listings differs from server to server and will likely cause this method to fail.

This method differs from using the listFiles() methods in that expensive FTPFile objects are not created until needed which may be an advantage on large lists.

FTPClient f=FTPClient();
f.connect(server);
f.login(username, password);
FTPListParseEngine engine = f.initiateListParsing(directory);

while (engine.hasNext()) {
FTPFile[] files = engine.getNext(25); // "page size" you want
//do whatever you want with these files, display them, etc.
//expensive FTPFile objects not created until needed.
}

return
A FTPListParseEngine object that holds the raw information and is capable of providing parsed FTPFile objects, one for each file containing information contained in the given path in the format determined by the parser parameter. Null will be returned if a data connection cannot be opened. If the current working directory contains no files, an empty array will be the return.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
exception
ParserInitializationException Thrown if the autodetect mechanism cannot resolve the type of system we are connected with.
see
FTPListParseEngine

        String key = null;
        return initiateListParsing(key, pathname);
    
public FTPListParseEngineinitiateListParsing(java.lang.String parserKey, java.lang.String pathname)
Using the supplied parser key, initialize an FTPListParseEngine object containing a raw file information for the supplied directory. This information is obtained through the LIST command. This object is then capable of being iterated to return a sequence of FTPFile objects with information filled in by the FTPFileEntryParser used.

The server may or may not expand glob expressions. You should avoid using glob expressions because the return format for glob listings differs from server to server and will likely cause this method to fail.

This method differs from using the listFiles() methods in that expensive FTPFile objects are not created until needed which may be an advantage on large lists.

param
parserKey A string representing a designated code or fully-qualified class name of an FTPFileEntryParser that should be used to parse each server file listing.
return
A FTPListParseEngine object that holds the raw information and is capable of providing parsed FTPFile objects, one for each file containing information contained in the given path in the format determined by the parser parameter. Null will be returned if a data connection cannot be opened. If the current working directory contains no files, an empty array will be the return.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
exception
ParserInitializationException Thrown if the parserKey parameter cannot be resolved by the selected parser factory. In the DefaultFTPEntryParserFactory, this will happen when parserKey is neither the fully qualified class name of a class implementing the interface org.apache.commons.net.ftp.FTPFileEntryParser nor a string containing one of the recognized keys mapping to such a parser or if class loader security issues prevent its being loaded.
see
FTPListParseEngine

        // We cache the value to avoid creation of a new object every
        // time a file listing is generated.
        if(__entryParser == null) {
            if (null != parserKey) {
                // if a parser key was supplied in the parameters, 
                // use that to create the paraser
        	    __entryParser = 
        	        __parserFactory.createFileEntryParser(parserKey);
                
            } else {
	            // if no parserKey was supplied, check for a configuration
	        	// in the params, and if non-null, use that.
            	if (null != __configuration) {
            	    __entryParser = 
            	        __parserFactory.createFileEntryParser(__configuration);
            	} else {
                    // if a parserKey hasn't been supplied, and a configuration
            	    // hasn't been supplied, then autodetect by calling
                    // the SYST command and use that to choose the parser.
            	    __entryParser = 
            	        __parserFactory.createFileEntryParser(getSystemName());
             	}
            }
        }

        return initiateListParsing(__entryParser, pathname);

    
private FTPListParseEngineinitiateListParsing(FTPFileEntryParser parser, java.lang.String pathname)
private method through which all listFiles() and initiateListParsing methods pass once a parser is determined.

exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
see
FTPListParseEngine

        Socket socket;

        FTPListParseEngine engine = new FTPListParseEngine(parser);
        if ((socket = _openDataConnection_(FTPCommand.LIST, pathname)) == null)
        {
            return engine;
        }


        engine.readServerList(socket.getInputStream(), getControlEncoding());

        socket.close();

        completePendingCommand();
        return engine;
    
public booleanisRemoteVerificationEnabled()
Return whether or not verification of the remote host participating in data connections is enabled. The default behavior is for verification to be enabled.

return
True if verification is enabled, false if not.

        return __remoteVerificationEnabled;
    
public FTPFile[]listFiles(java.lang.String parserKey, java.lang.String pathname)
Using the supplied parserKey, obtain a list of file information for the current working directory or for just a single file.

If key is null, this object will try to autodetect the system-type/parser-type by calling the SYST command.

Under the DefaultFTPFileEntryParserFactory, which is used unless a different factory has been specified, the key can be either a recognized System type for which a parser has been defined, or the fully qualified class name of a class that implements org.apache.commons.net.ftp.FTPFileEntryParser.

This information is obtained through the LIST command. The contents of the returned array is determined by the FTPFileEntryParser used.

param
parserKey This is a "handle" which the parser factory used must be able to resolve into a class implementing FTPFileEntryParser.

In the DefaultFTPFileEntryParserFactory, this may either be a specific key identifying a server type, which is used to identify a parser type, or the fully qualified class name of the parser. See DefaultFTPFileEntryParserFactory.createFileEntryParser for full details.

If this parameter is null, will attempt to generate a key by running the SYST command. This should cause no problem with the functionality implemented in the DefaultFTPFileEntryParserFactory, but may not map so well to an alternative user-created factory. If that is the case, calling this routine with a null parameter and a custom parser factory may not be advisable.

param
pathname The file or directory to list. Since the server may or may not expand glob expressions, using them here is not recommended and may well cause this method to fail.
return
The list of file information contained in the given path in the format determined by the parser represented by the parserKey parameter.

NOTE: This array may contain null members if any of the individual file listings failed to parse. The caller should check each entry for null before referencing it.

exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
exception
ParserInitializationException Thrown if the parserKey parameter cannot be resolved by the selected parser factory. In the DefaultFTPEntryParserFactory, this will happen when parserKey is neither the fully qualified class name of a class implementing the interface org.apache.commons.net.ftp.FTPFileEntryParser nor a string containing one of the recognized keys mapping to such a parser or if class loader security issues prevent its being loaded.
see
org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory
see
org.apache.commons.net.ftp.parser.FTPFileEntryParserFactory
see
org.apache.commons.net.ftp.FTPFileEntryParser
deprecated
use {@link #listFiles() listFiles()} or {@link #listFiles(String) listFiles(String)} instead and specify the parser Key in an {@link #FTPClientConfig FTPClientConfig} object instead.

        FTPListParseEngine engine =
            initiateListParsing(parserKey, pathname);
        return engine.getFiles();
    
public FTPFile[]listFiles(java.lang.String pathname)
Using the default system autodetect mechanism, obtain a list of file information for the current working directory or for just a single file.

This information is obtained through the LIST command. The contents of the returned array is determined by the FTPFileEntryParser used.

param
pathname The file or directory to list. Since the server may or may not expand glob expressions, using them here is not recommended and may well cause this method to fail.
return
The list of file information contained in the given path in the format determined by the autodetection mechanism
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
exception
ParserInitializationException Thrown if the parserKey parameter cannot be resolved by the selected parser factory. In the DefaultFTPEntryParserFactory, this will happen when parserKey is neither the fully qualified class name of a class implementing the interface org.apache.commons.net.ftp.FTPFileEntryParser nor a string containing one of the recognized keys mapping to such a parser or if class loader security issues prevent its being loaded.
see
org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory
see
org.apache.commons.net.ftp.parser.FTPFileEntryParserFactory
see
org.apache.commons.net.ftp.FTPFileEntryParser

        String key = null;
        FTPListParseEngine engine =
            initiateListParsing(key, pathname);
        return engine.getFiles();

    
public FTPFile[]listFiles()
Using the default system autodetect mechanism, obtain a list of file information for the current working directory.

This information is obtained through the LIST command. The contents of the returned array is determined by the FTPFileEntryParser used.

return
The list of file information contained in the current directory in the format determined by the autodetection mechanism.

NOTE: This array may contain null members if any of the individual file listings failed to parse. The caller should check each entry for null before referencing it.

exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
exception
ParserInitializationException Thrown if the parserKey parameter cannot be resolved by the selected parser factory. In the DefaultFTPEntryParserFactory, this will happen when parserKey is neither the fully qualified class name of a class implementing the interface org.apache.commons.net.ftp.FTPFileEntryParser nor a string containing one of the recognized keys mapping to such a parser or if class loader security issues prevent its being loaded.
see
org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory
see
org.apache.commons.net.ftp.parser.FTPFileEntryParserFactory
see
org.apache.commons.net.ftp.FTPFileEntryParser

        return listFiles((String) null);
    
public FTPFile[]listFiles(FTPFileListParser parser, java.lang.String pathname)
Using a programmer specified FTPFileListParser , obtain a list of file information for a directory or information for just a single file. This information is obtained through the LIST command. The contents of the returned array is determined by the FTPFileListParser used. The server may or may not expand glob expressions. You should avoid using glob expressions because the return format for glob listings differs from server to server and will likely cause this method to fail.

param
parser The FTPFileListParser that should be used to parse the server file listing.
param
pathname The file or directory to list.
return
The list of file information contained in the given path in the format determined by the parser parameter.

NOTE: This array may contain null members if any of the individual file listings failed to parse. The caller should check each entry for null before referencing it.

exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
return
The list of file information contained in the given path in the format determined by parserKey parameter.

NOTE: This array may contain null members if any of the individual file listings failed to parse. The caller should check each entry for null before referencing it.

exception
IOException
since
5 Jan 2004
deprecated
use listFiles(String parserKey, String pathname) instead

        Socket socket;
        FTPFile[] results;

        if ((socket = _openDataConnection_(FTPCommand.LIST, pathname)) == null)
            return new FTPFile[0];

        results = parser.parseFileList(socket.getInputStream(), getControlEncoding());

        socket.close();

        completePendingCommand();

        return results;
    
public FTPFile[]listFiles(FTPFileListParser parser)
Using a programmer specified FTPFileListParser , obtain a list of file information for the current working directory. This information is obtained through the LIST command. The contents of the array returned is determined by the FTPFileListParser used.

param
parser The FTPFileListParser that should be used to parse the server file listing.
return
The list of file information contained in the given path in the format determined by the parser parameter.

NOTE: This array may contain null members if any of the individual file listings failed to parse. The caller should check each entry for null before referencing it.

exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
exception
IOException
since
5 Jan 2004
deprecated
use listFiles(String parserKey) instead.

        return listFiles(parser, null);
    
public java.lang.StringlistHelp()
Fetches the system help information from the server and returns the full string.

return
The system help string obtained from the server. null if the information could not be obtained.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (FTPReply.isPositiveCompletion(help()))
            return getReplyString();
        return null;
    
public java.lang.StringlistHelp(java.lang.String command)
Fetches the help information for a given command from the server and returns the full string.

param
command The command on which to ask for help.
return
The command help string obtained from the server. null if the information could not be obtained.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (FTPReply.isPositiveCompletion(help(command)))
            return getReplyString();
        return null;
    
public java.lang.String[]listNames(java.lang.String pathname)
Obtain a list of filenames in a directory (or just the name of a given file, which is not particularly useful). This information is obtained through the NLST command. If the given pathname is a directory and contains no files, a zero length array is returned only if the FTP server returned a positive completion code, otherwise null is returned (the FTP server returned a 550 error No files found.). If the directory is not empty, an array of filenames in the directory is returned. If the pathname corresponds to a file, only that file will be listed. The server may or may not expand glob expressions.

param
pathname The file or directory to list.
return
The list of filenames contained in the given path. null if the list could not be obtained. If there are no filenames in the directory, a zero-length array is returned.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        String line;
        Socket socket;
        BufferedReader reader;
        Vector results;

        if ((socket = _openDataConnection_(FTPCommand.NLST, pathname)) == null)
            return null;

        reader =
            new BufferedReader(new InputStreamReader(socket.getInputStream(), getControlEncoding()));

        results = new Vector();
        while ((line = reader.readLine()) != null)
            results.addElement(line);
        reader.close();
        socket.close();

        if (completePendingCommand())
        {
            String[] result;
            result = new String[results.size()];
            results.copyInto(result);
            return result;
        }

        return null;
    
public java.lang.String[]listNames()
Obtain a list of filenames in the current working directory This information is obtained through the NLST command. If the current directory contains no files, a zero length array is returned only if the FTP server returned a positive completion code, otherwise, null is returned (the FTP server returned a 550 error No files found.). If the directory is not empty, an array of filenames in the directory is returned.

return
The list of filenames contained in the current working directory. null if the list could not be obtained. If there are no filenames in the directory, a zero-length array is returned.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return listNames(null);
    
public booleanlogin(java.lang.String username, java.lang.String password)
Login to the FTP server using the provided username and password.

param
username The username to login under.
param
password The password to use.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        user(username);

        if (FTPReply.isPositiveCompletion(_replyCode))
            return true;

        // If we get here, we either have an error code, or an intermmediate
        // reply requesting password.
        if (!FTPReply.isPositiveIntermediate(_replyCode))
            return false;

        return FTPReply.isPositiveCompletion(pass(password));
    
public booleanlogin(java.lang.String username, java.lang.String password, java.lang.String account)
Login to the FTP server using the provided username, password, and account. If no account is required by the server, only the username and password, the account information is not used.

param
username The username to login under.
param
password The password to use.
param
account The account to use.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        user(username);

        if (FTPReply.isPositiveCompletion(_replyCode))
            return true;

        // If we get here, we either have an error code, or an intermmediate
        // reply requesting password.
        if (!FTPReply.isPositiveIntermediate(_replyCode))
            return false;

        pass(password);

        if (FTPReply.isPositiveCompletion(_replyCode))
            return true;

        if (!FTPReply.isPositiveIntermediate(_replyCode))
            return false;

        return FTPReply.isPositiveCompletion(acct(account));
    
public booleanlogout()
Logout of the FTP server by sending the QUIT command.

return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(quit());
    
public booleanmakeDirectory(java.lang.String pathname)
Creates a new subdirectory on the FTP server in the current directory (if a relative pathname is given) or where specified (if an absolute pathname is given).

param
pathname The pathname of the directory to create.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(mkd(pathname));
    
public java.lang.StringprintWorkingDirectory()
Returns the pathname of the current working directory.

return
The pathname of the current working directory. If it cannot be obtained, returns null.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (pwd() != FTPReply.PATHNAME_CREATED)
            return null;

        return __parsePathname((String)_replyLines.elementAt(0));
    
booleanreinitialize()
Reinitialize the FTP session. Not all FTP servers support this command, which issues the FTP REIN command.

return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        rein();

        if (FTPReply.isPositiveCompletion(_replyCode) ||
                (FTPReply.isPositivePreliminary(_replyCode) &&
                 FTPReply.isPositiveCompletion(getReply())))
        {

            __initDefaults();

            return true;
        }

        return false;
    
public booleanremoteAppend(java.lang.String filename)
Initiate a server to server file transfer. This method tells the server to which the client is connected to append to a given file on the other server. The other server must have had a remoteRetrieve issued to it by another FTPClient.

param
filename The name of the file to be appended to, or if the file does not exist, the name to call the file being stored.

return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (__dataConnectionMode == ACTIVE_REMOTE_DATA_CONNECTION_MODE ||
                __dataConnectionMode == PASSIVE_REMOTE_DATA_CONNECTION_MODE)
            return FTPReply.isPositivePreliminary(stor(filename));
        return false;
    
public booleanremoteRetrieve(java.lang.String filename)
Initiate a server to server file transfer. This method tells the server to which the client is connected to retrieve a given file from the other server.

param
filename The name of the file to retrieve.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (__dataConnectionMode == ACTIVE_REMOTE_DATA_CONNECTION_MODE ||
                __dataConnectionMode == PASSIVE_REMOTE_DATA_CONNECTION_MODE)
            return FTPReply.isPositivePreliminary(retr(filename));
        return false;
    
public booleanremoteStore(java.lang.String filename)
Initiate a server to server file transfer. This method tells the server to which the client is connected to store a file on the other server using the given filename. The other server must have had a remoteRetrieve issued to it by another FTPClient.

param
filename The name to call the file that is to be stored.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (__dataConnectionMode == ACTIVE_REMOTE_DATA_CONNECTION_MODE ||
                __dataConnectionMode == PASSIVE_REMOTE_DATA_CONNECTION_MODE)
            return FTPReply.isPositivePreliminary(stor(filename));
        return false;
    
public booleanremoteStoreUnique(java.lang.String filename)
Initiate a server to server file transfer. This method tells the server to which the client is connected to store a file on the other server using a unique filename based on the given filename. The other server must have had a remoteRetrieve issued to it by another FTPClient.

param
filename The name on which to base the filename of the file that is to be stored.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (__dataConnectionMode == ACTIVE_REMOTE_DATA_CONNECTION_MODE ||
                __dataConnectionMode == PASSIVE_REMOTE_DATA_CONNECTION_MODE)
            return FTPReply.isPositivePreliminary(stou(filename));
        return false;
    
public booleanremoteStoreUnique()
Initiate a server to server file transfer. This method tells the server to which the client is connected to store a file on the other server using a unique filename. The other server must have had a remoteRetrieve issued to it by another FTPClient. Many FTP servers require that a base filename be given from which the unique filename can be derived. For those servers use the other version of remoteStoreUnique

return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (__dataConnectionMode == ACTIVE_REMOTE_DATA_CONNECTION_MODE ||
                __dataConnectionMode == PASSIVE_REMOTE_DATA_CONNECTION_MODE)
            return FTPReply.isPositivePreliminary(stou());
        return false;
    
public booleanremoveDirectory(java.lang.String pathname)
Removes a directory on the FTP server (if empty).

param
pathname The pathname of the directory to remove.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(rmd(pathname));
    
public booleanrename(java.lang.String from, java.lang.String to)
Renames a remote file.

param
from The name of the remote file to rename.
param
to The new name of the remote file.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (!FTPReply.isPositiveIntermediate(rnfr(from)))
            return false;

        return FTPReply.isPositiveCompletion(rnto(to));
    
private booleanrestart(long offset)
Restart a STREAM_TRANSFER_MODE file transfer starting from the given offset. This will only work on FTP servers supporting the REST comand for the stream transfer mode. However, most FTP servers support this. Any subsequent file transfer will start reading or writing the remote file from the indicated offset.

param
offset The offset into the remote file at which to start the next file transfer.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        __restartOffset = 0;
        return FTPReply.isPositiveIntermediate(rest(Long.toString(offset)));
    
public booleanretrieveFile(java.lang.String remote, java.io.OutputStream local)
Retrieves a named file from the server and writes it to the given OutputStream. This method does NOT close the given OutputStream. If the current file type is ASCII, line separators in the file are converted to the local representation.

param
remote The name of the remote file.
param
local The local OutputStream to which to write the file.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
CopyStreamException If an I/O error occurs while actually transferring the file. The CopyStreamException allows you to determine the number of bytes transferred and the IOException causing the error. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        InputStream input;
        Socket socket;

        if ((socket = _openDataConnection_(FTPCommand.RETR, remote)) == null)
            return false;

        input = new BufferedInputStream(socket.getInputStream(),
                                        getBufferSize());
        if (__fileType == ASCII_FILE_TYPE)
          input = new FromNetASCIIInputStream(input);
        // Treat everything else as binary for now
        try
        {
            Util.copyStream(input, local, getBufferSize(),
                            CopyStreamEvent.UNKNOWN_STREAM_SIZE, null,
                            false);
        }
        catch (IOException e)
        {
            try
            {
                socket.close();
            }
            catch (IOException f)
            {}
            throw e;
        }
        socket.close();
        return completePendingCommand();
    
public java.io.InputStreamretrieveFileStream(java.lang.String remote)
Returns an InputStream from which a named file from the server can be read. If the current file type is ASCII, the returned InputStream will convert line separators in the file to the local representation. You must close the InputStream when you finish reading from it. The InputStream itself will take care of closing the parent data connection socket upon being closed. To finalize the file transfer you must call {@link #completePendingCommand completePendingCommand } and check its return value to verify success.

param
remote The name of the remote file.
return
An InputStream from which the remote file can be read. If the data connection cannot be opened (e.g., the file does not exist), null is returned (in which case you may check the reply code to determine the exact reason for failure).
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        InputStream input;
        Socket socket;

        if ((socket = _openDataConnection_(FTPCommand.RETR, remote)) == null)
            return null;

        input = socket.getInputStream();
        if (__fileType == ASCII_FILE_TYPE) {
          // We buffer ascii transfers because the buffering has to
          // be interposed between FromNetASCIIOutputSream and the underlying
          // socket input stream.  We don't buffer binary transfers
          // because we don't want to impose a buffering policy on the
          // programmer if possible.  Programmers can decide on their
          // own if they want to wrap the SocketInputStream we return
          // for file types other than ASCII.
          input = new BufferedInputStream(input,
                                          getBufferSize());
          input = new FromNetASCIIInputStream(input);
        }
        return new org.apache.commons.net.io.SocketInputStream(socket, input);
    
public booleansendNoOp()
Sends a NOOP command to the FTP server. This is useful for preventing server timeouts.

return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(noop());
    
public booleansendSiteCommand(java.lang.String arguments)
Send a site specific command.

param
arguments The site specific command and arguments.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(site(arguments));
    
public voidsetBufferSize(int bufSize)
Set the internal buffer size.

param
bufSize The size of the buffer

    	__bufferSize = bufSize;
    
public voidsetDataTimeout(int timeout)
Sets the timeout in milliseconds to use when reading from the data connection. This timeout will be set immediately after opening the data connection.

param
timeout The default timeout in milliseconds that is used when opening a data connection socket.

        __dataTimeout = timeout;
    
public booleansetFileStructure(int structure)
Sets the file structure. The default structure is FTP.FILE_STRUCTURE if this method is never called.

param
structure The structure of the file (one of the FTP class _STRUCTURE constants).
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (FTPReply.isPositiveCompletion(stru(structure)))
        {
            __fileStructure = structure;
            return true;
        }
        return false;
    
public booleansetFileTransferMode(int mode)
Sets the transfer mode. The default transfer mode FTP.STREAM_TRANSFER_MODE if this method is never called.

param
mode The new transfer mode to use (one of the FTP class _TRANSFER_MODE constants).
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (FTPReply.isPositiveCompletion(mode(mode)))
        {
            __fileTransferMode = mode;
            return true;
        }
        return false;
    
public booleansetFileType(int fileType)
Sets the file type to be transferred. This should be one of FTP.ASCII_FILE_TYPE , FTP.IMAGE_FILE_TYPE , etc. The file type only needs to be set when you want to change the type. After changing it, the new type stays in effect until you change it again. The default file type is FTP.ASCII_FILE_TYPE if this method is never called.

param
fileType The _FILE_TYPE constant indcating the type of file.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (FTPReply.isPositiveCompletion(type(fileType)))
        {
            __fileType = fileType;
            __fileFormat = FTP.NON_PRINT_TEXT_FORMAT;
            return true;
        }
        return false;
    
public booleansetFileType(int fileType, int formatOrByteSize)
Sets the file type to be transferred and the format. The type should be one of FTP.ASCII_FILE_TYPE , FTP.IMAGE_FILE_TYPE , etc. The file type only needs to be set when you want to change the type. After changing it, the new type stays in effect until you change it again. The default file type is FTP.ASCII_FILE_TYPE if this method is never called. The format should be one of the FTP class TEXT_FORMAT constants, or if the type is FTP.LOCAL_FILE_TYPE , the format should be the byte size for that type. The default format is FTP.NON_PRINT_TEXT_FORMAT if this method is never called.

param
fileType The _FILE_TYPE constant indcating the type of file.
param
formatOrByteSize The format of the file (one of the _FORMAT constants. In the case of LOCAL_FILE_TYPE, the byte size.

return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        if (FTPReply.isPositiveCompletion(type(fileType, formatOrByteSize)))
        {
            __fileType = fileType;
            __fileFormat = formatOrByteSize;
            return true;
        }
        return false;
    
public voidsetParserFactory(org.apache.commons.net.ftp.parser.FTPFileEntryParserFactory parserFactory)
set the factory used for parser creation to the supplied factory object.

param
parserFactory factory object used to create FTPFileEntryParsers
see
org.apache.commons.net.ftp.parser.FTPFileEntryParserFactory
see
org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory

        __parserFactory = parserFactory;
    
public voidsetRemoteVerificationEnabled(boolean enable)
Enable or disable verification that the remote host taking part of a data connection is the same as the host to which the control connection is attached. The default is for verification to be enabled. You may set this value at any time, whether the FTPClient is currently connected or not.

param
enable True to enable verification, false to disable verification.

        __remoteVerificationEnabled = enable;
    
public voidsetRestartOffset(long offset)
Sets the restart offset. The restart command is sent to the server only before sending the file transfer command. When this is done, the restart marker is reset to zero.

param
offset The offset into the remote file at which to start the next file transfer. This must be a value greater than or equal to zero.

        if (offset >= 0)
            __restartOffset = offset;
    
public booleanstoreFile(java.lang.String remote, java.io.InputStream local)
Stores a file on the server using the given name and taking input from the given InputStream. This method does NOT close the given InputStream. If the current file type is ASCII, line separators in the file are transparently converted to the NETASCII format (i.e., you should not attempt to create a special InputStream to do this).

param
remote The name to give the remote file.
param
local The local InputStream from which to read the file.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
CopyStreamException If an I/O error occurs while actually transferring the file. The CopyStreamException allows you to determine the number of bytes transferred and the IOException causing the error. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return __storeFile(FTPCommand.STOR, remote, local);
    
public java.io.OutputStreamstoreFileStream(java.lang.String remote)
Returns an OutputStream through which data can be written to store a file on the server using the given name. If the current file type is ASCII, the returned OutputStream will convert line separators in the file to the NETASCII format (i.e., you should not attempt to create a special OutputStream to do this). You must close the OutputStream when you finish writing to it. The OutputStream itself will take care of closing the parent data connection socket upon being closed. To finalize the file transfer you must call {@link #completePendingCommand completePendingCommand } and check its return value to verify success.

param
remote The name to give the remote file.
return
An OutputStream through which the remote file can be written. If the data connection cannot be opened (e.g., the file does not exist), null is returned (in which case you may check the reply code to determine the exact reason for failure).
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return __storeFileStream(FTPCommand.STOR, remote);
    
public booleanstoreUniqueFile(java.lang.String remote, java.io.InputStream local)
Stores a file on the server using a unique name derived from the given name and taking input from the given InputStream. This method does NOT close the given InputStream. If the current file type is ASCII, line separators in the file are transparently converted to the NETASCII format (i.e., you should not attempt to create a special InputStream to do this).

param
remote The name on which to base the unique name given to the remote file.
param
local The local InputStream from which to read the file.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
CopyStreamException If an I/O error occurs while actually transferring the file. The CopyStreamException allows you to determine the number of bytes transferred and the IOException causing the error. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return __storeFile(FTPCommand.STOU, remote, local);
    
public booleanstoreUniqueFile(java.io.InputStream local)
Stores a file on the server using a unique name assigned by the server and taking input from the given InputStream. This method does NOT close the given InputStream. If the current file type is ASCII, line separators in the file are transparently converted to the NETASCII format (i.e., you should not attempt to create a special InputStream to do this).

param
local The local InputStream from which to read the file.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
CopyStreamException If an I/O error occurs while actually transferring the file. The CopyStreamException allows you to determine the number of bytes transferred and the IOException causing the error. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return __storeFile(FTPCommand.STOU, null, local);
    
public java.io.OutputStreamstoreUniqueFileStream(java.lang.String remote)
Returns an OutputStream through which data can be written to store a file on the server using a unique name derived from the given name. If the current file type is ASCII, the returned OutputStream will convert line separators in the file to the NETASCII format (i.e., you should not attempt to create a special OutputStream to do this). You must close the OutputStream when you finish writing to it. The OutputStream itself will take care of closing the parent data connection socket upon being closed. To finalize the file transfer you must call {@link #completePendingCommand completePendingCommand } and check its return value to verify success.

param
remote The name on which to base the unique name given to the remote file.
return
An OutputStream through which the remote file can be written. If the data connection cannot be opened (e.g., the file does not exist), null is returned (in which case you may check the reply code to determine the exact reason for failure).
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return __storeFileStream(FTPCommand.STOU, remote);
    
public java.io.OutputStreamstoreUniqueFileStream()
Returns an OutputStream through which data can be written to store a file on the server using a unique name assigned by the server. If the current file type is ASCII, the returned OutputStream will convert line separators in the file to the NETASCII format (i.e., you should not attempt to create a special OutputStream to do this). You must close the OutputStream when you finish writing to it. The OutputStream itself will take care of closing the parent data connection socket upon being closed. To finalize the file transfer you must call {@link #completePendingCommand completePendingCommand } and check its return value to verify success.

return
An OutputStream through which the remote file can be written. If the data connection cannot be opened (e.g., the file does not exist), null is returned (in which case you may check the reply code to determine the exact reason for failure).
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return __storeFileStream(FTPCommand.STOU, null);
    
public booleanstructureMount(java.lang.String pathname)
Issue the FTP SMNT command.

param
pathname The pathname to mount.
return
True if successfully completed, false if not.
exception
FTPConnectionClosedException If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
exception
IOException If an I/O error occurs while either sending a command to the server or receiving a reply from the server.

        return FTPReply.isPositiveCompletion(smnt(pathname));