nodejs发送udp广播还是蛮简单的,我们先写个服务器用于接收广播数据,代码如下:
var dgram = require("dgram");
var server = dgram.createSocket("udp4");
server.on("error", function (err) {
console.log("server error:\n" + err.stack);
server.close();
});
server.on("message", function (msg, rinfo) {
console.log("server got: " + msg + " from " +
rinfo.address + ":" + rinfo.port);
});
server.on("listening", function () {
var address = server.address();
console.log("server listening " +
address.address + ":" + address.port);
});
server.bind(41234);
然后写个客户端程序,发送广播消息,代码如下:
var dgram = require("dgram");
var socket = dgram.createSocket("udp4");
socket.bind(function () {
socket.setBroadcast(true);
});
var message = new Buffer("Hi");
socket.send(message, 0, message.length, 41234, '255.255.255.255', function(err, bytes) {
socket.close();
});
这里需要注意的是socket.setBroadcast(true);必须在绑定socket成功后才能调用,否则会报Error: setBroadcast EBADF的错误。
客户端发送广播还是蛮简单的,设置好需要发送的数据和端口等信息就OK了。