Client-Proxy-Server: Connection refused

Question

I was meddling with a client-proxy-server toy program.
Pardon my poor code construction. I have never had any previous knowledge in this field.
I have created  a client side program with my main that handles IO serially.
ProxY consists of 2 unscynchronized threads each interacts with client and server respectively.
Packet exchange within ProxY is relayed using a PacketBuffer object.
Server consist of a single threaded service. Below is the code for my main.
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Scanner;
public class TestProxy
     public static void main(String[] args) throws IOException
          final int SERVER_PORT = 19989;
          final int PROXY_PORT = 19988;
          ServerSocket proxyServerSoc = new ServerSocket(PROXY_PORT);
          Socket proxyClientSoc = new Socket("127.0.0.9",SERVER_PORT); //127.0.0.9 is server IP
          Server serv = new Server(SERVER_PORT);                             //Server started
          ProxY prox = new ProxY(proxyClientSoc, proxyServerSoc);            //proxy started
          //Start Client side;
          Socket toProxy = new Socket("127.0.0.1", PROXY_PORT);
          InputStream in = toProxy.getInputStream();
          OutputStream out = toProxy.getOutputStream();
          Scanner keyboard = new Scanner(System.in);
          String input;
          while(true)
               System.out.println("Enter data  : ");
               input = keyboard.nextLine();
               if(input.equals("exit")) break;
               System.out.println("data in BYTE: "+input.getBytes());
               System.out.println("Sending data to server ...");
               out.write(input.getBytes());
               try{
                    Thread.sleep(100);
               catch(InterruptedException e)
                    e.printStackTrace();
               System.out.println("Received from server :" + in.toString());
}Compilation is a success, but there is a runtime error...
When i attempt to run the program for the first time(tried on XP, Vista, 7, jdk1.6), windows prompts for network permission.
Before i can [edit]unblock[edit] it, my console window shows following error
C:\java\proxy>javac *.java
C:\java\proxy>java TestProxy
Exception in thread "main" java.net.ConnectException: Connection refused: connec
t
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(Unknown Source)
        at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.SocksSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at TestProxy.main(TestProxy.java:15)
C:\java\proxy>Can someone advise me where might i be possibly wrong?
Edited by: J-Ideas on Mar 10, 2010 10:50 PM

Answer 1

               out.write(input.getBytes());
               try{
                    Thread.sleep(100);
               catch(InterruptedException e)
                    e.printStackTrace();
               }What's that for?
               System.out.println("Received from server :" + in.toString());No no no. 'in' is an input stream. in.toString() is just a string representation of that object. It certainly isn't anything received from the server. If you want to receive data from the server you must call one of the in.read() methods.
When i attempt to run the program for the first time(tried on XP, Vista, 7, jdk1.6), windows prompts for network permission.
Before i can [edit]unblock[edit] it, my console window shows following errorYou should separate your program into three: server, proxy, and client, each with their own main() methods, so you can deal with these problems one at a time.