众所周知，UDP数据传输方式有 单播，组播，广播。
其中单播模式是最常用，这里就不再啰嗦了，网上随便都能搜到。
下面的示例主要实现简单的UDP组播方式。可以正常收发UDP数据。
Server端代码
const dgram = require('dgram'); const server = dgram.createSocket('udp4'); // const local_ip = "192.168.0.xx"; const multicast_ip = "225.0.0.100"; // 这里必须是一个组播地址(D类IP地址) server.on('close', ()=>{ console.log('close socket'); }); server.on('listening', ()=>{ console.log('listening...'); server.setBroadcast(true); server.setMulticastTTL(128); server.addMembership(multicast_ip); setInterval(()=>{ send_msg(); }, 2000); }); server.on('message', (msg, rinfo)=>{ console.log(`receive client message from ${rinfo.address}: ${rinfo.port}: ${msg}`); }); server.bind(); // 随机绑定本机一个端口 function send_msg(){ console.log('send msg'); server.send('hi, im server...', '8062', multicast_ip); }
Client端代码:
const dgram = require('dgram'); var client = dgram.createSocket('udp4'); // const local_ip = '192.168.0.xx'; const multicast_ip = "225.0.0.100"; // 这里必须是一个组播地址(D类IP地址) client.on('close', ()=>{ console.log('client closed'); }); client.on('error', (err) =>{ console.log('client error' + err); }); client.on('listening', ()=>{ console.log('client listening...'); client.setBroadcast(true); client.setMulticastTTL(128); client.addMembership(multicast_ip); }); client.on('message', (msg, rinfo) => { console.log(`receive server message from ${rinfo.address}: ${rinfo.port}: ${msg}`); }); client.bind('8062'); // 监听组播数据的端口
参考:
https://www.jb51.net/article/173468.htm
https://stackoverflow.com/questions/14130560/nodejs-udp-multicast-how-to