Lave en ping-client til ping-server

Hej eksperter.

Jeg prøver at lave en UDP Ping client til en færdiglavet UDP Ping Server

Serveren ser således ud: http://pastebin.com/sg1njCmF

Jeg har prøvet at lave en ping client, men det lykkedes ikke helt for mig.

Min ping-client ser således ud:

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

public class PingClient
{ 
  public static void main(String[] args) throws Exception
  {
        if (args.length != 2) {
            System.out.println("Required arguments: host port");
            return;
        }
        InetAddress host = InetAddress.getByName(args[0]);
        int port = Integer.parseInt(args[1]);
        DatagramSocket socket = new DatagramSocket(port, host);
        while (true) {
            Thread.sleep(1000);
            byte[] buf = new byte[256];
            InetAddress address = InetAddress.getByName(args[0]);
            DatagramPacket packet = new DatagramPacket(buf, buf.length, host, 2222);
            socket.send(packet);
           
            packet = new DatagramPacket(buf, buf.length);
            socket.receive(packet);
            String received = new String(packet.getData(), 0, packet.getLength());
            System.out.println("Modtaget " + received);
            }
        }
}