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

/** ThreadedEchoServer.java
   This program implements a multithreaded server that listens to
   port 8189 and echoes back all client input.
*/
public class ThreadedEchoServer {  
   public static void main(String[] args ){  
      try{  
         long i = 1;
         ServerSocket s = new ServerSocket(8189);
         for (;;){  
            Socket incoming = s.accept( );
            System.out.println("Spawning " + i);
            Thread t = new ThreadedEchoHandler(incoming);
            t.start();
            i++;
         }
      }
      catch (Exception e) {  
         e.printStackTrace();
      }
   }
}

/**
   This class handles one client input.
*/
class ThreadedEchoHandler extends Thread { 
   public ThreadedEchoHandler(Socket i) { 
      incoming = i;
   }

   public void run() {  
      try {  
         BufferedReader in = new BufferedReader
            (new InputStreamReader(incoming.getInputStream()));
         PrintWriter out = new PrintWriter
            (incoming.getOutputStream(), true /* autoFlush */);
         out.println( "Hello! Enter BYE to exit." );
         boolean done = false;
         while (!done) {  
            String str = in.readLine();
            if (str == null) done = true;
            else  {
                out.println("Echo = "+str);
                if (str.trim().equals("BYE"))
                  done = true;
            }
         }
         incoming.close();
      }
      catch (Exception e) {  
         e.printStackTrace();
      }
   }
   private Socket incoming;
}