基于udp协议的客户端和服务端简单示例

痛定思痛。 2022-11-20 03:58 216阅读 0赞

1、客户端代码如下：

import java.io.IOException;
    import java.net.DatagramPacket;
    import java.net.InetAddress;
    import java.net.DatagramSocket;
    
    /**
     *  udp客户端
     */
    public class UdpClient {
    
        public static void main(String[] args) throws IOException {
            String clientIp = "localhost";
            int clientPort = 8888;
            DatagramSocket client = new DatagramSocket(clientPort, InetAddress.getByName(clientIp));
    
            String serverIp = "localhost";
            int serverPort = 10000;
    
            String msg = "{ip:127.0.0.1}";
            byte[] buf = msg.getBytes();
            DatagramPacket dp = new DatagramPacket(buf, buf.length, InetAddress.getByName(serverIp), serverPort);
            client.send(dp);
            System.out.println("sent : " + msg);
    
            msg = "quit";
            buf = msg.getBytes();
            dp = new DatagramPacket(buf, buf.length, InetAddress.getByName(serverIp), serverPort);
            client.send(dp);
            System.out.println("sent : " + msg);
            client.close();
        }
    }

2、服务端代码如下：

import java.io.IOException;
    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    import java.net.InetAddress;
    
    /**
     *  服务端
     */
    public class UdpServer {
    
        public static void main(String[] args) throws IOException {
            String serverIp = "localhost";
            int serverPort = 10000;
    
            DatagramSocket server = new DatagramSocket(serverPort, InetAddress.getByName(serverIp));
            byte[] buf = new byte[1024];
    
            DatagramPacket dp = new DatagramPacket(buf, buf.length);
    
            String data = null;
            while(!"quit".equalsIgnoreCase(data)){
                server.receive(dp);
    
                String ip = dp.getAddress().getHostAddress();
                data = new String(dp.getData(), 0, dp.getLength());
    
                System.out.println(ip+"::"+data);
            }
            System.out.println("byebye");
            server.close();
        }
    }

3、先启动服务端，再启动客户端，运行结束后，控制台结果如下：

服务端：

127.0.0.1::{ip:127.0.0.1}
    127.0.0.1::quit
    byebye

客户端

sent : {ip:127.0.0.1}
    sent : quit

参考链接：https://bbs.csdn.net/topics/390961840