Threads to Handle Socket Connections

This program is Network Server that handles socket connection from clients. It assigns a separate thread to each new socket connection. This is a simple server. It echos back whatever the clients send.


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

class ClientHandler extends Thread
{
  protected Socket incoming;

  public ClientHandler (Socket incoming)
  {
    this.incoming = incoming;
  }

  public void run ()
  {
    try
    {
      BufferedReader in = new BufferedReader (new InputStreamReader (
			  incoming.getInputStream()));

      PrintWriter out = new PrintWriter (new OutputStreamWriter (
			incoming.getOutputStream()));

      out.println ("Hello! This is the Java MultiEchoServer.");
      out.println ("Enter BYE to exit.");
      out.flush ();

      while (true)
      {
        String str = in.readLine();
	if (str == null)
	{
          break;
	}
	else
	{
          out.println ("Echo: " + str);
	  out.flush();
	  if (str.trim().equals("BYE"))
	    break;
	}
      }
      incoming.close();
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
  }
}

public class MultiEchoServer
{
  public static void main (String[] args)
  {
    try
    {
      ServerSocket s = new ServerSocket (8008);
      while (true)
      {
        Socket incoming = s.accept();
	new ClientHandler (incoming).start();
      }
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
  }
}