var net = require("net");

var server = net.createServer(function(client_socket) {
  console.log("client coming");
});

server.listen({
  host:'127.0.0.1',
  port:6080,
  exclusive:true,
});

//端口要与需要连接的服务器端口一致
var socket = net.connect({
  port:6080,
  host:'127.0.0.1',
},
function(){
  console.log("connected to server!");
});

//tcpserver.js
var net = require('net');
var server = net.createServer(function(client_socket) {
  console.log("client coming");
  client_socket.setEncoding("utf8");
  //接收到客户端发送的错误就会调用
  client_socket.on("error",function(err){
    console.log("error");
  });
  //有接收到客户端的数据调用的函数
  //data 默认是Hex(二进制编码)格式，如果强制设置为utf8那么底层会先转换为utf8字符串传过去
  client_socket.on("data",function(data){
    console.log(data);
  });
  //用户断线离开
  client_socket.on("close",function(client_socket){
  console.log("close socket");
  });
});
//编写代码指示server监听到某个端口上
//配置好之后就会监听server 等待客户端接入
//host==> 地址 port ==>端口 exclusive ==> 独占模式
server.listen({
  host:'127.0.0.1',
  port:6080,
  exclusive:true,
});
server.on("connection",function(client_socket){
  console.log("connection");
});
//server.unref();//停止node对server的监听事件
server.on("error",function (error) {
  console.log("error is on server",error);
});
//服务器关闭事件
server.on("close",function(client_socket){
  console.log("close server");
});

//tcpclient.js
var net = require("net");
//net.socket类
var socket = net.connect({
  port:6080,
  host:'127.0.0.1',
},
function(){
  console.log("connected to server!");
});
//连接成功调用的事件
socket.on("connect",function(){
  console.log("connect success");
  //已utf-8的方式编码成二进制的数据传输
  socket.write("Hello World!","utf8");
});
//发生错误调用的事件
socket.on("error",function (err) {
  console.log("error is ",err);
});
//socket 关闭事件
socket.on("close",function(){
  console.log("close");
});
//对方发送关闭数据包的事件
socket.on("end",function(){
  console.log("end event");
})
//当有数据发送过来的时候调用
socket.on("data",function(data){
  console.log(data);
});