UDP node客户端和服务端

创建 UDP 服务器

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const dgram = require('dgram');   const server = dgram.createSocket('udp4'); // 创建 message 事件的接收器 server.on('message', (msg, rinfo) => {     console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`);     // 服务器发消息     server.send("message '" + msg + "' received!",     rinfo.port, rinfo.address); });   // 设置侦听事件的响应 server.on('listening', () => {     const address = server.address();     console.log(`server listening ${address.address}:${address.port}`); });   // 绑定到端口上 server.bind(4333);

　　

创建 UDP 客户端

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const dgram = require('dgram');   const client = dgram.createSocket('udp4');   const message = Buffer.from('Udp 客户端请求');   // 发送消息 client.send(message, 4333, 'localhost', (err) => {   client.close(); }); // 客户端收消息 client.on("message", (msg, rinfo) => {     console.log(`client got: ${msg} from ${rinfo.address}:${rinfo.port}`);     console.log("message from server, received");     console.log("message is" + msg);     client.close(); });