UDP网络编程

使用UDP协议编写一个网络程序，设置接收端程序的监听端口是8001，发送端发送的数据是“Hello,world”

接收端代码：

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

public class UdpJst {

	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		byte[] buf=new byte[1024];
		DatagramSocket ds=new DatagramSocket(8001);
		DatagramPacket dp=new DatagramPacket(buf, 1024);
		System.out.println("等待接收数据");
		ds.receive(dp);
		String str=new String(dp.getData(), 0, dp.getLength())+"\t"
		+dp.getAddress().getHostAddress()+":"+dp.getPort();
		System.out.println(str);
		ds.close();
	}

}

发送端代码：

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

public class UcpFsd {

	public static void main(String[] args) throws IOException {
		try {
			DatagramSocket ds=new DatagramSocket();
			String str="Hello, world";
			DatagramPacket dp=new DatagramPacket(str.getBytes(), str.length(), InetAddress.getByName("localhost"),8001);
			System.out.println("发送消息");
			ds.send(dp);
			ds.close();
		} catch (SocketException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

运行结果图：