proxy server in java

[akshay shetye]

i want to implement a proxy server in java. Is there any open source proxy server implemedtiaon in java. I was using the following code. I have to classed . One is main and other is ProxyserverThread. Will this code will be able to handel lots ot traffic if i deplaoy it for real use?? Is this approach right?? Also i want to replace some url with the new one.

 

/*
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 * and open the template in the editor.
 */

package proxyserver;


import com.sun.corba.se.spi.activation.Server;
import java.net.* ;
import java.io.* ;
import java.lang.* ;
import java.util.* ;



/**
 *
 * @author user
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    // Variable to track if an error occurred
boolean errorOccurred = false;

//Variables for the host and port parameters


    public static void main(String[] args) {
        // TODO code application logic here

        int localPort = -1;
        int remotePort = -1;
        String remoteHost = "www.youtube.com";

        System.out.print("dwdsw");
        

        Integer parseLocalPort = new Integer(555);
        Integer parseRemotePort = new Integer(80);
        localPort =80 ;
        
       remotePort = 80;

        //Create a listening socket at proxy

ServerSocket server = null;
try
{
	server = new ServerSocket(localPort);
}

catch(IOException e)
{
	System.err.println("Error: " + e.getMessage());
	System.exit(-1);
}

//Loop to listen for incoming connection,
//and accept if there is one

Socket incoming = null;
Socket outgoing = null;

while(true)
{
	try
	{
		// Create the 2 sockets to transmit incoming
		// and outgoing traffic of proxy server
		incoming = server.accept();
		outgoing = new Socket(remoteHost, remotePort);

		// Create the 2 threads for the incoming
		// and outgoing traffic of proxy server
		ProxyThread thread1 = new ProxyThread(incoming, outgoing);
		thread1.start();

		ProxyThread thread2 = new ProxyThread(outgoing, incoming);
		thread2.start();
	}
	catch (UnknownHostException e)
	{
		System.err.println("Error: Unknown Host " + remoteHost);
		System.exit(-1);
	}
	catch(IOException e)
	{
		//continue
		System.exit(-2);;
	}
}


        

    }

}




/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package proxyserver;

/**
 *
 * @author user
 */
import java.net.* ;
import java.io.* ;
import java.lang.* ;
import java.util.* ;

class ProxyThread extends Thread
{
	Socket incoming, outgoing;

	ProxyThread(Socket in, Socket out)
	{
		incoming = in;
		outgoing = out;
	}

	// Overwritten run() method of thread,
	// does the data transfers
	public void run()
	{
		byte[] buffer = new byte[5000];
		int numberRead = 0;
		OutputStream toClient;
		InputStream fromClient;

		try{
			toClient = outgoing.getOutputStream();
			fromClient = incoming.getInputStream();

			while(true)
			{
				numberRead = fromClient.read(buffer, 0, 50);
				if(numberRead == -1)
				{
					incoming.close();
					outgoing.close();
				}
                String st = new String(buffer,"US-ASCII");
                System.out.println("\n\nXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n\nXXXXXXXXXXXXXXXX\n\n" + st);
				

                toClient.write(buffer, 0, numberRead);
			}
		}
		catch(IOException e)
		{
		}
		catch(ArrayIndexOutOfBoundsException e)
		{
		}
	}
}






 

[akshay shetye]

why is no one replying?

[Paul Clapham]

Well, you haven't asked your question very well.

First of all you didn't say what kind of proxy you wanted to write. HTTP? FTP? Socks? Something else?

And then you posted some code, but you didn't ask any answerable questions about it. No, "Will this code will be able to handel lots ot traffic if i deplaoy it for real use??" isn't an answerable question. It's hard enough to look at code and tell what it does, let alone whether it does it correctly or whether it does it well.

But I would have to say if your actual goal is to write an HTTP proxy server in Java, I would recommend instead that you should just get an HTTP proxy server which has already been written, and don't worry about whether it was written in Java. Unless perhaps your goal is to learn about network programming. In which case you should not be worrying at this point about whether it's scalable.