/** 
 * This program is an example from the book "Internet 
 * programming with Java" by Svetlin Nakov. It is freeware. 
 * For more information: http://www.nakov.com/books/inetjava/ 
 */ 
import java.net.*; 
 
public class MulticastSender { 
    public static final String 
        MULTICAST_GROUP_ADDRESS = "224.0.0.1"; 
    public static final int TARGET_PORT = 2004; 
 
    public static void main(String[] args) throws Exception { 
        InetAddress multicastGroupAddr = 
            InetAddress.getByName(MULTICAST_GROUP_ADDRESS); 
        MulticastSocket multicastSocket = new MulticastSocket(); 
        while (true) { 
            String message = "Hello " + new java.util.Date(); 
            DatagramPacket packet = new DatagramPacket( 
                message.getBytes(), message.length(), 
                multicastGroupAddr, TARGET_PORT); 
            multicastSocket.send(packet); 
            System.out.println("Sent UDP packet to " + 
                MULTICAST_GROUP_ADDRESS + ":" + TARGET_PORT); 
            Thread.sleep(1000); 
        } 
    } 
}