接收数据报

import java.io.IOException;
/*
时 代 J a v a 公 众 号 - N o w J a v  a . c o m 提 供
*/

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.SocketException;


public class Main {


  public void m() {

    try {

      byte[] inbuf = new byte[256]; // default size

      DatagramSocket socket = new DatagramSocket();


      // Wait for packet

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

      socket.receive(packet);


      // Data is now in inbuf

      int numBytesReceived = packet.getLength();