import java.net.*;
import java.io.*;
import java.util.*;
public class Redirector implements Runnable {
private int port;
private String newSite;
public Redirector(String site, int port) {
this.port = port;
this.newSite = site;
}
public void run() {
try {
ServerSocket server = new ServerSocket(this.port);
System.out.println("Redirecting connections on port "
+ server.getLocalPort() + " to " + newSite);
while (true) {
try {
Socket s = server.accept();
Thread t = new RedirectThread(s);
t.start();
} // end try
catch (IOException e) {
}
} // end while
} // end try
catch (BindException e) {
System.err.println("Could not start server. Port Occupied");
}
catch (IOException e) {
System.err.println(e);
}
} // end run
class RedirectThread extends Thread {
private Socket connection;
RedirectThread(Socket s) {
this.connection = s;
}
public void run() {
try {
Writer out = new BufferedWriter(
new OutputStreamWriter(
connection.getOutputStream(), "ASCII"
)
);
Reader in = new InputStreamReader(
new BufferedInputStream(
connection.getInputStream()
)
);
// read the first line only; that's all we need
StringBuffer request = new StringBuffer(80);
while (true) {
int c = in.read();
if (c == '\r' || c == '\n' || c == -1) break;
request.append((char) c);
}
// If this is HTTP/1.0 or later send a MIME header
String get = request.toString();
int firstSpace = get.indexOf(' ');
int secondSpace = get.indexOf(' ', firstSpace+1);
String theFile = get.substring(firstSpace+1, secondSpace);
if (get.indexOf("HTTP/") != -1) {
out.write("HTTP/1.0 302 FOUND\r\n");
Date now = new Date();
out.write("Date: " + now + "\r\n");
out.write("Server: Redirector 1.0\r\n");
out.write("Location: " + newSite + theFile + "\r\n");
out.write("Content-type: text/html\r\n\r\n");
out.flush();
}
// Not all browsers support redirection so we need to
// produce HTML that says where the document has moved to.
out.write("<HTML><HEAD><TITLE>Document moved</TITLE></HEAD>\r\n");
out.write("<BODY><H1>Document moved</H1>\r\n");
out.write("The document " + theFile
+ " has moved to\r\n<A HREF=\"" + newSite + theFile + "\">" + newSite
+ theFile + "</A>.\r\n Please update your bookmarks<P>");
out.write("</BODY></HTML>\r\n");
out.flush();
} // end try
catch (IOException e) {
}
finally {
try {
if (connection != null) connection.close();
}
catch (IOException e) {}
}
} // end run
}
public static void main(String[] args) {
int thePort;
String theSite;
try {
theSite = args[0];
// trim trailing slash
if (theSite.endsWith("/")) {
theSite = theSite.substring(0, theSite.length()-1);
}
}
catch (Exception e) {
System.out.println(
"Usage: java Redirector http://www.newsite.com/ port");
return;
}
try {
thePort = Integer.parseInt(args[1]);
}
catch (Exception e) {
thePort = 80;
}
Thread t = new Thread(new Redirector(theSite, thePort));
t.start();
} // end main
}
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