UDP node客户端和服务端

创建 UDP 服务器

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

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();
});