Java tutorial
import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; public class Main { public static void main(String[] argv) throws Exception { byte[] outbuf = new byte[1024]; int port = 1234; DatagramSocket socket = new DatagramSocket(); InetAddress groupAddr = InetAddress.getByName("8.1.2.3"); DatagramPacket packet = new DatagramPacket(outbuf, outbuf.length, groupAddr, port); socket.send(packet); } }