Java tutorial
import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; public class Main { public static void main(String args[]) { try { InetAddress ia = InetAddress.getByName("www.java2s.com"); DatagramSocket ds = new DatagramSocket(); byte buffer[] = "hello".getBytes(); DatagramPacket dp = new DatagramPacket(buffer, buffer.length, ia, 80); ds.setSendBufferSize(1000); ds.send(dp); } catch (Exception e) { e.printStackTrace(); } } }