// Purpose.  ServerSocket demo  (multi-threaded)  [source: Horstmann98, p145]

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

class ThreadedEchoHandler extends Thread {
   private Socket socket;
   private int    id;

   public ThreadedEchoHandler( Socket in, int num ) {
      socket = in;
      id = num;
   }
   public void run() {
      try {
         BufferedReader in  = new BufferedReader( 
                            new InputStreamReader( socket.getInputStream() ) );
         PrintWriter    out = new PrintWriter(
                            socket.getOutputStream(), true );  // auto-flush
         while (true) {
            out.println( "   (" + id + ") enter text or 'x' to exit -" );
            String str = in.readLine();
            if (str == null)       break;
            if (str.equals( "x" )) break;
            System.out.println( "   ---" + id + "---" + str + "---" );
            out.println( "   ---" + str + "---" );
         }
         socket.close();
      } catch( IOException e ) { e.printStackTrace(); }
      System.out.println( "closing handler " + id );
}  }

public class ServerSocketThreaded {
   public static void main( String[] args ) {
      int count = 1;
      try {
         ServerSocket server = new ServerSocket( 8189 );
         while (true) {
            Socket socket = server.accept();
            System.out.println( "spawning handler " + count );
            new ThreadedEchoHandler( socket, count++ ).start();
         }
      } catch( Exception e ) { e.printStackTrace(); }
}  }

// C:> java ServerSocketThreaded
// spawning handler 1
// spawning handler 2
// spawning handler 3
//    ---1---123 234 345---
//    ---2---222 333 444---
//    ---3---321 432 543---
// closing handler 3
// closing handler 2
// closing handler 1

// C:> telnet
//    (3) enter text or 'x' to exit -
// 321 432 543
//    ---321 432 543---
//    (3) enter text or 'x' to exit -
// x