nodejs代码段（七）

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1.udp服务器端

var dgram = require('dgram');var HOST = '127.0.0.1';var PORT =8877;var server = dgram.createSocket('udp4');server.on('listening',function(){console.log("UDP Server listening on....");console.info();});server.on('message',function(message,remote){console.log("emmited message event");console.info();server.close();});server.on('error',function(err){console.log("server error:\n"+err.stack);console.info();server.close();});server.on('close',function(){console.log("server close");console.info();});server.bind(PORT,HOST);

客户端

var dgram = require('dgram');var HOST = '127.0.0.1';var PORT =8877;var message = new Buffer('UDP client to server: hello server');var client = dgram.createSocket('udp4');client.send(message,0,message.length,PORT,HOST,function(err,bytes){if(err){throw err;}console.log("UDP message sent to....");console.info();client.close();});client.on('close',function(){console.log('client disconneced');console.info();})

2.简单的udp应用

服务器：

var dgram = require('dgram');var HOST = '127.0.0.1';var PORT =8877;var server = dgram.createSocket('udp4');server.on('listening',function(){var address = server.address();console.log("UDP Server listening on"+address.address+":"+address.port);console.info();});server.on('message',function(message,remote){console.log("received from"+remote.address+':'+remote.port);console.log("-"+message);console.info();server.close();});server.on('error',function(err){console.log("server error:\n"+err.stack);console.info();server.close();});server.on('close',function(){console.log("server close");console.info();});server.bind(PORT,HOST);

客户端：

var dgram = require('dgram');var HOST = '127.0.0.1';var PORT =8877;var message = new Buffer('UDP client to server: hello server');var client = dgram.createSocket('udp4');client.send(message,0,message.length,PORT,HOST,function(err,bytes){if(err){throw err;}console.log("UDP message sent to"+HOST+':'+PORT);console.info();console.info(bytes);console.info();client.close();});client.on('close',function(){console.log('client disconneced');console.info();})

3.数据报Udp广播服务的实现

服务器

var dgram = require('dgram');var HOST = '127.0.0.1';var PORT =8877;var server = dgram.createSocket('udp4');server.on('listening',function(){var address = server.address();console.log("UDP Server listening on"+address.address+":"+address.port);console.info();});server.on('message',function(message,remote){console.log("received from"+remote.address+':'+remote.port);console.log("-"+message);console.info();server.close();});server.on('error',function(err){console.log("server error:\n"+err.stack);console.info();server.close();});server.on('close',function(){console.log("server close");console.info();});server.bind(PORT);

客户端

var dgram = require('dgram');var HOST = '255.255.255.255';var PORT =8877;var message = new Buffer('UDP client to server: hello server');var client = dgram.createSocket('udp4');client.bind(function(){client.setBroadcast(true);});client.send(message,0,message.length,PORT,HOST,function(err,bytes){if(err){throw err;}console.log("UDP message sent to"+HOST+':'+PORT);console.info();console.info(bytes);console.info();client.close();});client.on('close',function(){console.log('client disconneced');console.info();})

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