/* * To change this template, choose Tools | Templates * and open the template in the editor. */import java.io.*;import java.net.*;/** * * @author admin */public class server { private static ServerSocket  servSock;   private static final int PORT = 5000 ;   public static void main(String args[]) throws IOException{      System.out.println("Opening Port.....\n");      try{         servSock = new ServerSocket(PORT);      }catch(IOException e){         System.out.println("Unable to attach to port");         System.exit(1);      }      do{         Socket client = servSock.accept();         ClientHandler handler = new ClientHandler(client);         handler.start();      }while(true);   }}class ClientHandler extends Thread{   private Socket client ;   private BufferedReader in ;   private PrintWriter out ;   public ClientHandler(Socket socket){      client = socket ;      try{         in = new BufferedReader(new InputStreamReader(client.getInputStream()));         out = new PrintWriter(client.getOutputStream(),true);      }catch(IOException e){         e.printStackTrace();      }   }   public void run(){      try{         String received ;         do{            received = in.readLine();            System.out.println(received);            out.println("ECHO : " + received);         }while(!received.equals("QUIT"));                  }catch(IOException e){         e.printStackTrace();      }      finally{         try{            if (client != null){               System.out.println("Closing down connection");               client.close();            }         }catch(IOException e){            e.printStackTrace();         }      }   }}