datagramsclientstring.java~20~

jbuilder2006一书的所有源代码

package datagrams;

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

public class DatagramsClientString {

  public static void main(String[] args) throws IOException {
    //创建DatagramSocket类,用于发送与接收数据包
    DatagramSocket datagramSocket = new DatagramSocket();
    //创建byte数组
    byte[] buf = new byte[20];
    //创建根据服务器名字取得服务器地址的InetAddress类
    InetAddress address = InetAddress.getByName("bemyfriend");
    //创建带有网络地址与端口的数据包
    DatagramPacket packet = new DatagramPacket(buf, buf.length, address, 5556);
    //根据网络地址与端口发送数据包
    datagramSocket.send(packet);
    //创建一个数据包
    packet = new DatagramPacket(buf, buf.length);
    //接收返回的数据包
    datagramSocket.receive(packet);
    System.out.println(packet.getLength());
    //通过getData()方法获取数据包的数据
    System.out.println("数据包的字符串: " + received.trim());
    System.out.println("完成数据的接收.");
    //关闭UDP的DatagramScoket接口
    datagramSocket.close();
  }
}