Thread: Multithreaded Proxy Server java

I am currently implementing a multithreaded proxy server in java which will accept messages from clients and forward them to another server which will then acknowledge the reception of the message. However, i'm having trouble doing so. Could someone point out what i am doing wrong? Thanks.


CLIENT SIDE

import java.io.*;
import java.net.*;
import java.util.Scanner;

public class Client{
public static void main(String[] args)
{
try
{
Socket client = new Socket(InetAddress.getLocalHost(), 6789);

if(client.isBound())
{
System.out.println("Successfully connected on port 6789");
}

Scanner scanner = new Scanner(System.in);

DataInputStream inFromProxy = new DataInputStream(client.getInputStream());
DataOutputStream outToProxy = new DataOutputStream(client.getOutputStream());

while(true)
{
String message;

System.out.print("Enter your message: ");
message = scanner.next();

outToProxy.writeUTF(message);
System.out.println(inFromProxy.readUTF());
}

}
catch(IOException io)
{
System.err.println("IOException: " + io.getMessage());
System.exit(2);
}


}
}




SERVER SIDE

import java.io.*;
import java.net.*;

public class Server {
public static void main(String[] args)
{
try
{
ServerSocket server = new ServerSocket(6780);

if(server.isBound())
{
System.out.println("Server successfully connected on port 6780");
}

Socket client = null;
while(true)
{
client = server.accept();

if(client.isConnected())
{
System.out.println("Proxy is connected");
}

DataInputStream inFromProxy = new DataInputStream(client.getInputStream());
DataOutputStream outToProxy = new DataOutputStream(client.getOutputStream());

System.out.println(inFromProxy.readUTF());

outToProxy.writeUTF("Message has been acknowledged!");
}

}
catch(IOException io)
{
System.err.println("IOException: " + io.getMessage());
System.exit(2);
}
}
}





PROXY

import java.io.*;
import java.net.*;
public class Proxy{
public static ServerSocket server = null;
public static Socket client = null;


public static void main(String[] args)
{
try
{
server = new ServerSocket(6789);
Socket clientsocket = null;

while(true)
{
client = server.accept();

if(client.isConnected())
{
System.out.println("Proxy is currently listening to client on port 6789");
}
clientsocket=new Socket(InetAddress.getLocalHost(),6780);
Thread t1 = new ProxyHandler(client, clientsocket);
t1.start();
Thread t2 = new ProxyHandler(clientsocket,client);
t2.start();


if(clientsocket.isBound())
{
System.out.println("Clientsocket successfully connected on port 6780");
}



}
}
catch(IOException io)
{
System.err.println("IOException: " + io.getMessage());
}
}
}



PROXYHANDLER

import java.io.*;
import java.net.*;
public class ProxyHandler extends Thread {

private Socket socket;
private String message;

public ProxyHandler(Socket socket, Socket clientsocket)
{
this.socket = socket;
}


public void run()
{
message = "";
try
{
DataInputStream in = new DataInputStream(socket.getInputStream());
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
while(true)
{
message = in.readUTF();
out.writeUTF(message);

System.out.println(message);
}
}
catch(IOException io)
{
System.err.println("IOException: " + io.getMessage());
System.exit(2);
}
}
}

My output is as follows:

Server successfully connected on port 6780
Proxy is connected

But what I was trying to do was that Client Sending a message to the Server Via a proxy but that is not happening and sorry about the formatting its my first Post.

Hmmmm if i send you send you a client and a server can you build a proxy for me? It the answer is positive then I'll explain to you what my Client-Server does thank you..

hey hello, well am trying to write a multithreaded proxy server, whereby it should act like :

(1) Client forward request to proxy
(2) Proxy forward request to server
(3) Server returns request to Proxy
(4) Proxy returns request to Client.


can you please help me

hey hello, well am trying to write a multithreaded proxy server, whereby it should act like :

(1) Client forward request to proxy
(2) Proxy forward request to server
(3) Server returns request to Proxy
(4) Proxy returns request to Client.


can you please help me

am just a beginner trying to make this work, i can not understand what i really have to do, please help me...

I tried implementing it but its not working, Run my server code, followed by the Proxy Code and then Run the Client, you will get this :

Server successfully connected on port 6780
Proxy is connected

But it is not allowing the user(me) to input my message