Node.js中创建UDP服务器和客户端的例子

var PORT = 33333;
var HOST = '127.0.0.1';

var dgram = require('dgram'); // UDP需要引入该模块
var server = dgram.createSocket('udp4'); // ipv4

// 给server绑定'listening'事件处理函数
server.on('listening', function () {
    var address = server.address();
    console.log('UDP Server listening on ' + address.address + ":" + address.port);
});

// 给server绑定'message'事件处理函数
server.on('message', function (message, remote) {
    console.log(remote.address + ':' + remote.port +' - ' + message);

});

// 监听地址及端口
server.bind(PORT, HOST);

var PORT = 33333;
var HOST = '127.0.0.1';

var dgram = require('dgram');
var message = new Buffer('some thing you send');

var client = dgram.createSocket('udp4'); // ipv4
client.send(message, 0, message.length, PORT, HOST, function(err, bytes) {
    if (err) throw err;
    console.log('UDP message sent to ' + HOST +':'+ PORT);
    client.close();
});