// This example is from the book _Java in a Nutshell_ by David Flanagan.
// Written by David Flanagan.  Copyright (c) 1996 O'Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or implied.

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

// This class sends the specified text as a datagram to port 6010 of the 
// specified host.
public class UDPSend {
    static final int port = 6010;
    public static void main(String args[]) throws Exception {
        if (args.length != 2) {
            System.out.println("Usage: java UDPSend <hostname> <message>");
            System.exit(0);
        }
        
        // Get the internet address of the specified host
        InetAddress address = InetAddress.getByName(args[0]);
        // Convert the message to an array of bytes
        int msglen = args[1].length();
        byte[] message = new byte[msglen];
        args[1].getBytes(0, msglen, message, 0);
        // Initilize the packet with data and address
        DatagramPacket packet = new DatagramPacket(message, msglen, 
                               address, port);
        // Create a socket, and send the packet through it.
        DatagramSocket socket = new DatagramSocket();
        socket.send(packet);
    }
}