Contents

1. 代码实现

const PORT = 18001;

const HOST = '127.0.0.1';

var net = require('net');

var clientHandler = function(socket){

  console.log('someon connected');

  socket.on('data',function dataHandler(data){

    console.log(socket.remoteAddress,socket.remotePort,'send',data.toString());

    socket.write('server received\n');

  });////data 当客户端发来数据时触发

  socket.on('close',function(){

    console.log(socket.remoteAddress,soctet.remotePort,'disconnected');

    //socket之后被销毁

  });

};

var app= net.createServer(clientHandler);

app.listen(PORT,HOST);

console.log('tcp server running on tcp:://',HOST,':',PORT);

//当connect事件发生时，触发回调函数

2. 使用telnet连接服务器测试

telnet localhost 18001 会触发connect事件 输入一段字 回车，便可发送 使用netstat -antp|grep 18001

3. 创建一个TCP的client

var net = require('net');

const HOST = '127.0.0.1';

const PORT = 18001;

var tcpClient = net.SOcket();

tcpClient.connect(PORT,HOST,function(){

  console.log('connect success.');

  tcpClient.write('this is tcp client by nodejs');

});

tcpClient.on('data',function(data){//监听

   console.log('received: ',data);

});