datagramsclient.java

JAVA类库参考手册

import java.io.*;
import java.net.*;
import java.util.*;

public class DatagramsClient {
  public static void main(String[] args) throws IOException {

    //创建DatagramSocket类,用于发送与接收数据包
    DatagramSocket socket = new DatagramSocket();

    //创建byte数组
    byte[] buf = new byte[200];
    //创建包括服务器地址的InetAddress类
    InetAddress address = InetAddress.getByName("localhost");
    //创建带有网络地址与端口的数据包
    DatagramPacket packet = new DatagramPacket(buf, buf.length, address, 8888);
    //根据网络地址与端口发送数据包
    socket.send(packet);

    //创建一个数据包
    packet = new DatagramPacket(buf, buf.length);
    //接收返回的数据包
    socket.receive(packet);

    //通过getData()方法获取数据包的数据
    String received = new String(packet.getData());
    System.out.println("数据包的数据: " + received);

    socket.close();       //关闭UDP的scoket接口
  }
}