import java.net.DatagramSocket;

import java.net.DatagramPacket;

import java.io.IOException;

import java.net.InetAddress;

public class DGClient{

public static void main(String[] args){

if(args.length!=1){

System.out.println("usage: java DGClient message");

return;

}

byte[] messageBytes = args[0].getBytes();

try{

byte[] buffer = new byte[128];

System.arraycopy(messageBytes, 0, buffer, 0, messageBytes.length);

DatagramSocket dgs = new DatagramSocket();

DatagramPacket dgp = new DatagramPacket(buffer, buffer.length, InetAddress.getByName(DGServer.SERVER_IP), DGServer.SERVER_PORT);

dgs.send(dgp);

// waiting and get echoing message

dgs.receive(dgp);

System.out.println("Client Receive Echo: " + new String(dgp.getData()));

// Explore the buffer size that DatagramSocket support by underlying platform.

System.out.println("ReceiveBufferSize: " + dgs.getReceiveBufferSize() + ", SendBufferSize: " + dgs.getSendBufferSize());

}catch(IOException ioe){

ioe.printStackTrace();

}

}

}