Proxy em Java

Pessoal,

Gostaria de compartilhar um código simples que fiz, é um proxy que fiz para debugar algumas operações que trafegavam pela rede.

Espero que apreciem !

 //------------------------------------------------  
 import java.net.*;  
 import java.io.*;  
 class Proxy {  
   public static void main(String args[]) throws IOException {  
     int localport = 3128;  
     int remoteport = 3128;  
     String remotehost = "192.168.1.1";  
     boolean error = false;  
     Socket incoming, outgoing = null;  
     ServerSocket Server = null;  
     if (localport <= 0) {  
       System.err.println("Error: Invalid Local Port Specification "  
           + "\n");  
       error = true;  
     }  
     if (remoteport <= 0) {  
       System.err.println("Error: Invalid Remote Port Specification "  
           + "\n");  
       error = true;  
     }  
     if (remotehost == null) {  
       System.err.println("Error: Invalid Remote Host Specification "  
           + "\n");  
       error = true;  
     }  
     // If any errors so far, exit program  
     if (error)  
       System.exit(-1);  
     // Test and create a listening socket at proxy  
     try {  
       Server = new ServerSocket(localport);  
     } catch (IOException e) {  
       e.printStackTrace();  
     }  
     // Loop to listen for incoming connection, and accept if there is one  
     while (true) {  
       try {  
         incoming = Server.accept();  
         // Create the 2 threads for the incoming and outgoing traffic of  
         // proxy server  
         outgoing = new Socket(remotehost, remoteport);  
         ProxyThread thread1 = new ProxyThread(incoming, outgoing);  
         thread1.start();  
         ProxyThread thread2 = new ProxyThread(outgoing, incoming);  
         thread2.start();  
       } catch (UnknownHostException e) {  
         // Test and make connection to remote host  
         System.err.println("Error: Unknown Host " + remotehost);  
         System.exit(-1);  
       } catch (IOException e) {  
         System.exit(-2);// continue;  
       }  
       /*  
        * catch (IOException e) {  
        * System.err.println("Error: Couldn't Initiate I/O connection for "  
        * + remotehost); System.exit(-1); }  
        */  
     }  
   }  
 }  
 //------------------------------------------------  

e a thread ...

 //------------------------------------------------ 
 import java.net.*; 
 import java.io.*; 
 public class ProxyThread extends Thread { 
   Socket incoming, outgoing; 
   // Thread constructor 
   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[1024]; 
     int numberRead = 0; 
     OutputStream ToClient; 
     InputStream FromClient; 
     try { 
       ToClient = outgoing.getOutputStream(); 
       FromClient = incoming.getInputStream(); 
       while (true) { 
         numberRead = FromClient.read(buffer); 
         //System.out.println("read " + new String(buffer)); 
         // buffer[numberRead] = buffer[0] = (byte)'+'; 
         if (numberRead == -1) { 
           incoming.close(); 
           outgoing.close(); 
         } 
         ToClient.write(buffer, 0, numberRead); 
       } 
     } catch (IOException e) { 
     } catch (ArrayIndexOutOfBoundsException e) { 
     } 
   } 
 } 
 //------------------------------------------------