Receiving a Datagram : UDP Client « Network « Java Tutorial

1. Java Tutorial
2. Network
3. UDP Client

import java.net.DatagramPacket;
import java.net.DatagramSocket;

public class Main {
  public static void main(String[] argv) throws Exception {
    byte[] inbuf = new byte[256]; // default size
    DatagramSocket socket = new DatagramSocket();

    DatagramPacket packet = new DatagramPacket(inbuf, inbuf.length);
    socket.receive(packet);

    int numBytesReceived = packet.getLength();
    System.out.println(numBytesReceived);
  }
}