File	Doc	Category	Size	Date	Package
URLConnection.java	API Doc	Example	47799	Sat Sep 09 21:21:12 BST 2000	java.net

URLConnection

• java.lang.Object

Fields Summary
protected URL	url The URL represents the remote object on the World Wide Web to which this connection is opened. The value of this field can be accessed by the getURL method. The default value of this variable is the value of the URL argument in the URLConnection constructor.
protected boolean	doInput This variable is set by the setDoInput method. Its value is returned by the getDoInput method. A URL connection can be used for input and/or output. Setting the doInput flag to true indicates that the application intends to read data from the URL connection. The default value of this field is true.
protected boolean	doOutput This variable is set by the setDoOutput method. Its value is returned by the getDoInput method. A URL connection can be used for input and/or output. Setting the doOutput flag to true indicates that the application intends to write data to the URL connection. The default value of this field is false.
private static boolean	defaultAllowUserInteraction
protected boolean	allowUserInteraction If true, this URL is being examined in a context in which it makes sense to allow user interactions such as popping up an authentication dialog. If false, then no user interaction is allowed. The value of this field can be set by the setAllowUserInteraction method. Its value is returned by the getAllowUserInteraction method. Its default value is the value of the argument in the last invocation of the setDefaultAllowUserInteraction method.
private static boolean	defaultUseCaches
protected boolean	useCaches If true, the protocol is allowed to use caching whenever it can. If false, the protocol must always try to get a fresh copy of the object. This field is set by the setUseCaches method. Its value is returned by the getUseCaches method. Its default value is the value given in the last invocation of the setDefaultUseCaches method.
protected long	ifModifiedSince Some protocols support skipping the fetching of the object unless the object has been modified more recently than a certain time. A nonzero value gives a time as the number of seconds since January 1, 1970, GMT. The object is fetched only if it has been modified more recently than that time. This variable is set by the setIfModifiedSince method. Its value is returned by the getIfModifiedSince method. The default value of this field is 0, indicating that the fetching must always occur.
protected boolean	connected If false, this connection object has not created a communications link to the specified URL. If true, the communications link has been established.
private static FileNameMap	fileNameMap
static ContentHandlerFactory	factory The ContentHandler factory.
private static Hashtable	handlers
private static final ContentHandler	UnknownContentHandlerP
private static final String	contentClassPrefix
private static final String	contentPathProp

Constructors Summary
protected URLConnection(URL url) Constructs a URL connection to the specified URL. A connection to the object referenced by the URL is not created. param url the specified URL. this.url = url;

Methods Summary
private static boolean	checkfpx(java.io.InputStream is) Check for FlashPix image data in InputStream is. Return true if the stream has FlashPix data, false otherwise. Before calling this method, the stream should have already been checked to be sure it contains Microsoft Structured Storage data. /* Test for FlashPix image data in Microsoft Structured Storage format. * In general, should do this with calls to an SS implementation. * Lacking that, need to dig via offsets to get to the FlashPix * ClassID. Details: * * Offset to Fpx ClsID from beginning of stream should be: * * FpxClsidOffset = rootEntryOffset + clsidOffset * * where: clsidOffset = 0x50. * rootEntryOffset = headerSize + sectorSize*sectDirStart * + 128*rootEntryDirectory * * where: headerSize = 0x200 (always) * sectorSize = 2 raised to power of uSectorShift, * which is found in the header at * offset 0x1E. * sectDirStart = found in the header at offset 0x30. * rootEntryDirectory = in general, should search for * directory labelled as root. * We will assume value of 0 (i.e., * rootEntry is in first directory) */ // Mark the stream so we can reset it. 0x100 is enough for the first // few reads, but the mark will have to be reset and set again once // the offset to the root directory entry is computed. That offset // can be very large and isn't know until the stream has been read from is.mark(0x100); // Get the byte ordering located at 0x1E. 0xFE is Intel, // 0xFF is other long toSkip = (long)0x1C; long skipped = 0; while (skipped != toSkip) { skipped += is.skip(toSkip - skipped); } long posn = skipped; int byteOrder = is.read(); is.read(); posn+=2; int uSectorShift; if(byteOrder == 0xFE) { uSectorShift = is.read(); uSectorShift += is.read() << 8; } else { uSectorShift = is.read() << 8; uSectorShift += is.read(); } posn += 2; toSkip = (long)0x30 - posn; skipped = 0; while (skipped != toSkip) { skipped += is.skip(toSkip - skipped); } posn += skipped; int sectDirStart; if(byteOrder == 0xFE) { sectDirStart = is.read(); sectDirStart += is.read()<<8; sectDirStart += is.read()<<16; sectDirStart += is.read()<<24; } else { sectDirStart = is.read()<<24; sectDirStart += is.read()<<16; sectDirStart += is.read()<<8; sectDirStart += is.read(); } posn += 4; is.reset(); // Reset back to the beginning toSkip = (long)0x200 + (long)((int)1<<uSectorShift)*sectDirStart + (long)0x50; // How far can we skip? Is there any performance problem here? // This skip can be fairly long, at least 0x4c650 in at least // one case. Have to assume that the skip will fit in an int. is.mark((int)toSkip+0x30); // Leave room to read whole root dir skipped = 0; while (skipped != toSkip) { skipped += is.skip(toSkip - skipped); } /* should be at beginning of ClassID, which is as follows * (in Intel byte order): * 00 67 61 56 54 C1 CE 11 85 53 00 AA 00 A1 F9 5B * * This is stored from Windows as long,short,short,char[8] * so for byte order changes, the order only changes for * the first 8 bytes in the ClassID. * * Test against this, ignoring second byte (Intel) since * this could change depending on part of Fpx file we have. */ int c[] = new int[16]; for (int i=0; i<16; i++) c[i] = is.read(); // intel byte order if (byteOrder == 0xFE && c[0] == 0x00 && c[2] == 0x61 && c[3] == 0x56 && c[4] == 0x54 && c[5] == 0xC1 && c[6] == 0xCE && c[7] == 0x11 && c[8] == 0x85 && c[9] == 0x53 && c[10]== 0x00 && c[11]== 0xAA && c[12]== 0x00 && c[13]== 0xA1 && c[14]== 0xF9 && c[15]== 0x5B) { is.reset(); return true; } // non-intel byte order else if (c[3] == 0x00 && c[1] == 0x61 && c[0] == 0x56 && c[5] == 0x54 && c[4] == 0xC1 && c[7] == 0xCE && c[6] == 0x11 && c[8] == 0x85 && c[9] == 0x53 && c[10]== 0x00 && c[11]== 0xAA && c[12]== 0x00 && c[13]== 0xA1 && c[14]== 0xF9 && c[15]== 0x5B) { is.reset(); return true; } is.reset(); return false;
public abstract void	connect() Opens a communications link to the resource referenced by this URL, if such a connection has not already been established. If the connect method is called when the connection has already been opened (indicated by the connected field having the value true), the call is ignored. URLConnection objects go through two phases: first they are created, then they are connected. After being created, and before being connected, various options can be specified (e.g., doInput and UseCaches). After connecting, it is an error to try to set them. Operations that depend on being connected, like getContentLength, will implicitly perform the connection, if necessary. exception IOException if an I/O error occurs while opening the connection. see java.net.URLConnection#connected
public boolean	getAllowUserInteraction() Returns the value of the allowUserInteraction field for this object. return the value of the allowUserInteraction field for this object. see java.net.URLConnection#allowUserInteraction return allowUserInteraction;
public java.lang.Object	getContent() Retrieves the contents of this URL connection. This method first determines the content type of the object by calling the getContentType method. If this is the first time that the application has seen that specific content type, a content handler for that content type is created: If the application has set up a content handler factory instance using the setContentHandlerFactory method, the createContentHandler method of that instance is called with the content type as an argument; the result is a content handler for that content type. If no content handler factory has yet been set up, or if the factory's createContentHandler method returns null, then the application loads the class named: sun.net.www.content.<contentType> where <contentType> is formed by taking the content-type string, replacing all slash characters with a period ('.'), and all other non-alphanumeric characters with the underscore character '_'. The alphanumeric characters are specifically the 26 uppercase ASCII letters 'A' through 'Z', the 26 lowercase ASCII letters 'a' through 'z', and the 10 ASCII digits '0' through '9'. If the specified class does not exist, or is not a subclass of ContentHandler, then an UnknownServiceException is thrown. return the object fetched. The instanceOf operation should be used to determine the specific kind of object returned. exception IOException if an I/O error occurs while getting the content. exception UnknownServiceException if the protocol does not support the content type. see java.net.ContentHandlerFactory#createContentHandler(java.lang.String) see java.net.URLConnection#getContentType() see java.net.URLConnection#setContentHandlerFactory(java.net.ContentHandlerFactory) // Must call getInputStream before GetHeaderField gets called // so that FileNotFoundException has a chance to be thrown up // from here without being caught. getInputStream(); return getContentHandler().getContent(this);
public java.lang.String	getContentEncoding() Returns the value of the content-encoding header field. return the content encoding of the resource that the URL references, or null if not known. see java.net.URLConnection#getHeaderField(java.lang.String) return getHeaderField("content-encoding");
synchronized java.net.ContentHandler	getContentHandler() Gets the Content Handler appropriate for this connection. param connection the connection to use. String contentType = getContentType(); ContentHandler handler = null; if (contentType == null) throw new UnknownServiceException("no content-type"); try { handler = (ContentHandler) handlers.get(contentType); if (handler != null) return handler; } catch(Exception e) { } if (factory != null) handler = factory.createContentHandler(contentType); if (handler == null) { try { handler = lookupContentHandlerClassFor(contentType); } catch(Exception e) { e.printStackTrace(); handler = UnknownContentHandlerP; } handlers.put(contentType, handler); } return handler;
private java.lang.String	getContentHandlerPkgPrefixes() Returns a vertical bar separated list of package prefixes for potential content handlers. Tries to get the java.content.handler.pkgs property to use as a set of package prefixes to search. Whether or not that property has been defined, the sun.net.www.content is always the last one on the returned package list. String packagePrefixList = (String) AccessController.doPrivileged( new sun.security.action.GetPropertyAction(contentPathProp, "")); if (packagePrefixList != "") { packagePrefixList += "|"; } return packagePrefixList + contentClassPrefix;
public int	getContentLength() Returns the value of the content-length header field. return the content length of the resource that this connection's URL references, or -1 if the content length is not known. return getHeaderFieldInt("content-length", -1);
public java.lang.String	getContentType() Returns the value of the content-type header field. return the content type of the resource that the URL references, or null if not known. see java.net.URLConnection#getHeaderField(java.lang.String) return getHeaderField("content-type");
public long	getDate() Returns the value of the date header field. return the sending date of the resource that the URL references, or 0 if not known. The value returned is the number of seconds since January 1, 1970 GMT. see java.net.URLConnection#getHeaderField(java.lang.String) return getHeaderFieldDate("date", 0);
public static boolean	getDefaultAllowUserInteraction() Returns the default value of the allowUserInteraction field. Ths default is "sticky", being a part of the static state of all URLConnections. This flag applies to the next, and all following URLConnections that are created. return the default value of the allowUserInteraction field. see java.net.URLConnection#allowUserInteraction return defaultAllowUserInteraction;
public static java.lang.String	getDefaultRequestProperty(java.lang.String key) Returns the value of the default request property. Default request properties are set for every connection. return the value of the default request property for the specified key. see java.net.URLConnection#setDefaultRequestProperty(java.lang.String, java.lang.String) return null;
public boolean	getDefaultUseCaches() Returns the default value of a URLConnection's useCaches flag. Ths default is "sticky", being a part of the static state of all URLConnections. This flag applies to the next, and all following URLConnections that are created. return the default value of a URLConnection's useCaches flag. see java.net.URLConnection#useCaches return defaultUseCaches;
public boolean	getDoInput() Returns the value of this URLConnection's doInput flag. return the value of this URLConnection's doInput flag. see java.net.URLConnection#doInput return doInput;
public boolean	getDoOutput() Returns the value of this URLConnection's doOutput flag. return the value of this URLConnection's doOutput flag. see java.net.URLConnection#doOutput return doOutput;
public long	getExpiration() Returns the value of the expires header field. return the expiration date of the resource that this URL references, or 0 if not known. The value is the number of seconds since January 1, 1970 GMT. see java.net.URLConnection#getHeaderField(java.lang.String) return getHeaderFieldDate("expires", 0);
public static java.net.FileNameMap	getFileNameMap() Returns the FileNameMap. returns the FileNameMap since JDK1.2 return new FileNameMap() { public String getContentTypeFor(String fileName) { return fileNameMap.getContentTypeFor(fileName); } };
public java.lang.String	getHeaderField(java.lang.String name) Returns the name of the specified header field. param name the name of a header field. return the value of the named header field, or null if there is no such field in the header. return null;
public java.lang.String	getHeaderField(int n) Returns the value for the nth header field. It returns null if there are fewer than n fields. This method can be used in conjunction with the getHeaderFieldKey method to iterate through all the headers in the message. param n an index. return the value of the nth header field. see java.net.URLConnection#getHeaderFieldKey(int) return null;
public long	getHeaderFieldDate(java.lang.String name, long Default) Returns the value of the named field parsed as date. The result is the number of seconds since January 1, 1970 GMT represented by the named field. This form of getHeaderField exists because some connection types (e.g., http-ng) have pre-parsed headers. Classes for that connection type can override this method and short-circuit the parsing. param name the name of the header field. param Default a default value. return the value of the field, parsed as a date. The value of the Default argument is returned if the field is missing or malformed. try { return Date.parse(getHeaderField(name)); } catch(Throwable t) {} return Default;
public int	getHeaderFieldInt(java.lang.String name, int Default) Returns the value of the named field parsed as a number. This form of getHeaderField exists because some connection types (e.g., http-ng) have pre-parsed headers. Classes for that connection type can override this method and short-circuit the parsing. param name the name of the header field. param Default the default value. return the value of the named field, parsed as an integer. The Default value is returned if the field is missing or malformed. try { return Integer.parseInt(getHeaderField(name)); } catch(Throwable t) {} return Default;
public java.lang.String	getHeaderFieldKey(int n) Returns the key for the nth header field. param n an index. return the key for the nth header field, or null if there are fewer than n fields. return null;
public long	getIfModifiedSince() Returns the value of this object's ifModifiedSince field. return the value of this object's ifModifiedSince field. see java.net.URLConnection#ifModifiedSince return ifModifiedSince;
public java.io.InputStream	getInputStream() Returns an input stream that reads from this open connection. return an input stream that reads from this open connection. exception IOException if an I/O error occurs while creating the input stream. exception UnknownServiceException if the protocol does not support input. throw new UnknownServiceException("protocol doesn't support input");
public long	getLastModified() Returns the value of the last-modified header field. The result is the number of seconds since January 1, 1970 GMT. return the date the resource referenced by this URLConnection was last modified, or 0 if not known. see java.net.URLConnection#getHeaderField(java.lang.String) return getHeaderFieldDate("last-modified", 0);
public java.io.OutputStream	getOutputStream() Returns an output stream that writes to this connection. return an output stream that writes to this connection. exception IOException if an I/O error occurs while creating the output stream. exception UnknownServiceException if the protocol does not support output. throw new UnknownServiceException("protocol doesn't support output");
public java.security.Permission	getPermission() Returns a permission object representing the permission necessary to make the connection represented by this object. This method returns null if no permission is required to make the connection. By default, this method returns java.security.AllPermission. Subclasses should override this method and return the permission that best represents the permission required to make a a connection to the URL. For example, a URLConnection representing a file: URL would return a java.io.FilePermission object. The permission returned may dependent upon the state of the connection. For example, the permission before connecting may be different from that after connecting. For example, an HTTP sever, say foo.com, may redirect the connection to a different host, say bar.com. Before connecting the permission returned by the connection will represent the permission needed to connect to foo.com, while the permission returned after connecting will be to bar.com. Permissions are generally used for two purposes: to protect caches of objects obtained through URLConnections, and to check the right of a recipient to learn about a particular URL. In the first case, the permission should be obtained after the object has been obtained. For example, in an HTTP connection, this will represent the permission to connect to the host from which the data was ultimately fetched. In the second case, the permission should be obtained and tested before connecting. return the permission object representing the permission necessary to make the connection represented by this URLConnection. exception IOException if the computation of the permission requires network or file I/O and an exception occurs while computing it. return new java.security.AllPermission();
public java.lang.String	getRequestProperty(java.lang.String key) Returns the value of the named general request property for this connection. return the value of the named general request property for this connection. if (connected) throw new IllegalAccessError("Already connected"); return null;
public java.net.URL	getURL() Returns the value of this URLConnection's URL field. return the value of this URLConnection's URL field. see java.net.URLConnection#url return url;
public boolean	getUseCaches() Returns the value of this URLConnection's useCaches field. return the value of this URLConnection's useCaches field. see java.net.URLConnection#useCaches return useCaches;
protected static java.lang.String	guessContentTypeFromName(java.lang.String fname) Tries to determine the content type of an object, based on the specified "file" component of a URL. This is a convenience method that can be used by subclasses that override the getContentType method. param fname a filename. return a guess as to what the content type of the object is, based upon its file name. see java.net.URLConnection#getContentType() String contentType = null; if (fileNameMap != null) { contentType = fileNameMap.getContentTypeFor(fname); } return contentType;
public static java.lang.String	guessContentTypeFromStream(java.io.InputStream is) Tries to determine the type of an input stream based on the characters at the beginning of the input stream. This method can be used by subclasses that override the getContentType method. Ideally, this routine would not be needed. But many http servers return the incorrect content type; in addition, there are many nonstandard extensions. Direct inspection of the bytes to determine the content type is often more accurate than believing the content type claimed by the http server. param is an input stream that supports marks. return a guess at the content type, or null if none can be determined. exception IOException if an I/O error occurs while reading the input stream. see java.io.InputStream#mark(int) see java.io.InputStream#markSupported() see java.net.URLConnection#getContentType() is.mark(10); int c1 = is.read(); int c2 = is.read(); int c3 = is.read(); int c4 = is.read(); int c5 = is.read(); int c6 = is.read(); int c7 = is.read(); int c8 = is.read(); is.reset(); if (c1 == 0xCA && c2 == 0xFE && c3 == 0xBA && c4 == 0xBE) return "application/java-vm"; if (c1 == 0xAC && c2 == 0xED) // next two bytes are version number, currently 0x00 0x05 return "application/x-java-serialized-object"; if (c1 == 'G" && c2 == 'I" && c3 == 'F" && c4 == '8") return "image/gif"; if (c1 == '#" && c2 == 'd" && c3 == 'e" && c4 == 'f") return "image/x-bitmap"; if (c1 == '!" && c2 == ' " && c3 == 'X" && c4 == 'P" && c5 == 'M" && c6 == '2") return "image/x-pixmap"; if (c1 == 0x2E && c2 == 0x73 && c3 == 0x6E && c4 == 0x64) return "audio/basic"; // .au format, big endian if (c1 == 0x64 && c2 == 0x6E && c3 == 0x73 && c4 == 0x2E) return "audio/basic"; // .au format, little endian if (c1 == '<") if (c2 == '!" || ((c2 == 'h" && (c3 == 't" && c4 == 'm" && c5 == 'l" || c3 == 'e" && c4 == 'a" && c5 == 'd") || c2 == 'b" && c3 == 'o" && c4 == 'd" && c5 == 'y")) || ((c2 == 'H" && (c3 == 'T" && c4 == 'M" && c5 == 'L" || c3 == 'E" && c4 == 'A" && c5 == 'D") || c2 == 'B" && c3 == 'O" && c4 == 'D" && c5 == 'Y"))) return "text/html"; if (c1 == 0xFF && c2 == 0xD8 && c3 == 0xFF && c4 == 0xE0) return "image/jpeg"; if (c1 == 0xFF && c2 == 0xD8 && c3 == 0xFF && c4 == 0xEE) return "image/jpg"; if (c1 == 'R" && c2 == 'I" && c3 == 'F" && c4 == 'F") /* I don't know if this is official but evidence * suggests that .wav files start with "RIFF" - brown */ return "audio/x-wav"; if (c1 == 0xD0 && c2 == 0xCF && c3 == 0x11 && c4 == 0xE0 && c5 == 0xA1 && c6 == 0xB1 && c7 == 0x1A && c8 == 0xE1) { /* Above is signature of Microsoft Structured Storage. * Below this, could have tests for various SS entities. * For now, just test for FlashPix. */ if (checkfpx(is)) return "image/vnd.fpx"; } return null;
private java.net.ContentHandler	lookupContentHandlerClassFor(java.lang.String contentType) Looks for a content handler in a user-defineable set of places. By default it looks in sun.net.www.content, but users can define a vertical-bar delimited set of class prefixes to search through in addition by defining the java.content.handler.pkgs property. The class name must be of the form: {package-prefix}.{major}.{minor} e.g. YoyoDyne.experimental.text.plain System.err.println("Content type: " + contentType); String contentHandlerClassName = typeToPackageName(contentType); System.err.println("contentHandlerClassName: " + contentHandlerClassName); String contentHandlerPkgPrefixes =getContentHandlerPkgPrefixes(); System.err.println("contentHandlerPkgPrefixes: " + contentHandlerPkgPrefixes); StringTokenizer packagePrefixIter = new StringTokenizer(contentHandlerPkgPrefixes, "|"); while (packagePrefixIter.hasMoreTokens()) { String packagePrefix = packagePrefixIter.nextToken().trim(); System.err.println("packagePrefix: " + packagePrefix); try { String name = packagePrefix + "." + contentHandlerClassName; System.err.println("name: " + name); ContentHandler handler = (ContentHandler) Class.forName(name).newInstance(); return handler; } catch(Exception e) { System.err.println(e); } } return UnknownContentHandlerP;
public void	setAllowUserInteraction(boolean allowuserinteraction) Set the value of the allowUserInteraction field of this URLConnection. param allowuserinteraction the new value. see java.net.URLConnection#allowUserInteraction if (connected) throw new IllegalAccessError("Already connected"); allowUserInteraction = allowuserinteraction;
public static synchronized void	setContentHandlerFactory(java.net.ContentHandlerFactory fac) Sets the ContentHandlerFactory of an application. It can be called at most once by an application. The ContentHandlerFactory instance is used to construct a content handler from a content type If there is a security manager, this method first calls the security manager's checkSetFactory method to ensure the operation is allowed. This could result in a SecurityException. param fac the desired factory. exception Error if the factory has already been defined. exception SecurityException if a security manager exists and its checkSetFactory method doesn't allow the operation. see java.net.ContentHandlerFactory see java.net.URLConnection#getContent() see SecurityManager#checkSetFactory if (factory != null) { throw new Error("factory already defined"); } SecurityManager security = System.getSecurityManager(); if (security != null) { security.checkSetFactory(); } factory = fac;
public static void	setDefaultAllowUserInteraction(boolean defaultallowuserinteraction) Sets the default value of the allowUserInteraction field for all future URLConnection objects to the specified value. param defaultallowuserinteraction the new value. see java.net.URLConnection#allowUserInteraction defaultAllowUserInteraction = defaultallowuserinteraction;
public static void	setDefaultRequestProperty(java.lang.String key, java.lang.String value) Sets the default value of a general request property. When a URLConnection is created, it is initialized with these properties. param key the keyword by which the request is known (e.g., "accept"). param value the value associated with the key.
public void	setDefaultUseCaches(boolean defaultusecaches) Sets the default value of the useCaches field to the specified value. param defaultusecaches the new value. see java.net.URLConnection#useCaches defaultUseCaches = defaultusecaches;
public void	setDoInput(boolean doinput) Sets the value of the doInput field for this URLConnection to the specified value. A URL connection can be used for input and/or output. Set the DoInput flag to true if you intend to use the URL connection for input, false if not. The default is true unless DoOutput is explicitly set to true, in which case DoInput defaults to false. param value the new value. see java.net.URLConnection#doInput if (connected) throw new IllegalAccessError("Already connected"); doInput = doinput;
public void	setDoOutput(boolean dooutput) Sets the value of the doOutput field for this URLConnection to the specified value. A URL connection can be used for input and/or output. Set the DoOutput flag to true if you intend to use the URL connection for output, false if not. The default is false. param value the new value. see java.net.URLConnection#doOutput if (connected) throw new IllegalAccessError("Already connected"); doOutput = dooutput;
public static void	setFileNameMap(java.net.FileNameMap map) Sets the FileNameMap. If there is a security manager, this method first calls the security manager's checkSetFactory method to ensure the operation is allowed. This could result in a SecurityException. param map the FileNameMap to be set exception SecurityException if a security manager exists and its checkSetFactory method doesn't allow the operation. see SecurityManager#checkSetFactory since JDK1.2 SecurityManager sm = System.getSecurityManager(); if (sm != null) sm.checkSetFactory(); fileNameMap = map;
public void	setIfModifiedSince(long ifmodifiedsince) Sets the value of the ifModifiedSince field of this URLConnection to the specified value. param value the new value. see java.net.URLConnection#ifModifiedSince if (connected) throw new IllegalAccessError("Already connected"); ifModifiedSince = ifmodifiedsince;
public void	setRequestProperty(java.lang.String key, java.lang.String value) Sets the general request property. param key the keyword by which the request is known (e.g., "accept"). param value the value associated with it. if (connected) throw new IllegalAccessError("Already connected");
public void	setUseCaches(boolean usecaches) Sets the value of the useCaches field of this URLConnection to the specified value. Some protocols do caching of documents. Occasionally, it is important to be able to "tunnel through" and ignore the caches (e.g., the "reload" button in a browser). If the UseCaches flag on a connection is true, the connection is allowed to use whatever caches it can. If false, caches are to be ignored. The default value comes from DefaultUseCaches, which defaults to true. see java.net.URLConnection#useCaches if (connected) throw new IllegalAccessError("Already connected"); useCaches = usecaches;
public java.lang.String	toString() Returns a String representation of this URL connection. return a string representation of this URLConnection. return this.getClass().getName() + ":" + url;
private java.lang.String	typeToPackageName(java.lang.String contentType) Utility function to map a MIME content type into an equivalent pair of class name components. For example: "text/html" would be returned as "text.html" // make sure we canonicalize the class name: all lower case contentType = contentType.toLowerCase(); int len = contentType.length(); char nm[] = new char[len]; contentType.getChars(0, len, nm, 0); for (int i = 0; i < len; i++) { char c = nm[i]; if (c == '/") { nm[i] = '."; } else if (!('A" <= c && c <= 'Z" || 'a" <= c && c <= 'z" || '0" <= c && c <= '9")) { nm[i] = '_"; } } return new String(nm);