server.java

java socket for server

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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();
         }
      }
   }


}