var net = require('net');
//創(chuàng)建tcp服務(wù)器
var server = net.createServer(); 

//監(jiān)聽(tīng)connect事件
server.on('connection', (socket) => {
    socket.on('data',(data)=>{
        console.log(data.toString(), 'data')
    })
})

//設(shè)置監(jiān)聽(tīng)端口
server.listen(8989);

//設(shè)置監(jiān)聽(tīng)時(shí)的回調(diào)函數(shù)
server.on('listening', (res)=>{
    console.log('in listen...')
})

//第二種寫法
var net = require('net');
//創(chuàng)建tcp服務(wù)器
var server = net.createServer((socket) => {
    socket.on('data', (data) => {
        console.log(data.toString(), 'data..')
    })
});
//設(shè)置監(jiān)聽(tīng)端口
server.listen(8989, (res) => {
    console.log('in listen...')
});

//創(chuàng)建一個(gè)TCP服務(wù)器
var server = net.createServer((socket) => {
    //'connect'事件的回調(diào)函數(shù)
    console.log('客戶端已連接');
    socket.on('end', () => {
        console.log('客戶端已斷開(kāi)');
    })
    //接收來(lái)自客戶端的數(shù)據(jù)
    socket.on('data', (data) => {
        console.log(data.toString(), 'data');
        var readSize = socket.bytesRead;
        console.log('the size of data is ' + readSize);
    })

    //向客戶端寫入數(shù)據(jù)
    socket.write('hello\r\n');

    //設(shè)置連接最大數(shù)量，可不設(shè)
    server.maxConnection = 3;

    server.getConnections(function (err, count) {

        console.log('the count of clieent is ' + count);

    });

})

server.listen(8989, () => {
    console.log('服務(wù)器已啟動(dòng)');
    //獲取地址信息
    var address = server.address();

    //獲取地址端口
    console.log('the port of server is ' + address.port);
    console.log('the address of server is ' + address.address);
    console.log('the ip family of server is ' + address.family);
})

//創(chuàng)建一個(gè)客戶端
var client = net.connect({ port: 8989 }, () => {
    console.log('連接到服務(wù)器');
    //向服務(wù)端發(fā)送數(shù)據(jù)
    client.write('hello，i am from client');
})

//監(jiān)聽(tīng)事件，當(dāng)服務(wù)端發(fā)送數(shù)據(jù)過(guò)來(lái)時(shí)會(huì)觸發(fā)該事件
client.on('data', (data) => {
    console.log(data, 'data');
    client.end()
})

client.on('end', () => {
    console.log('已從服務(wù)器斷開(kāi)');
});

/*server.js*/
var net = require('net');
//這兒用一個(gè)對(duì)象來(lái)模擬數(shù)據(jù)庫(kù)，保存用戶名和密碼
var user = {
    admin: '123',
    test: '333',
    lucy: '222',
}
//臨時(shí)變量保存用戶輸入的內(nèi)容
var username = '';

var server = net.createServer((socket)=>{
    console.log('服務(wù)器已連接');
    socket.write('請(qǐng)輸入用戶名：');
    socket.on('data',(data)=>{
        //通過(guò)stdin輸入的內(nèi)容是buffer，需要轉(zhuǎn)成字符串且清除空格
        data = data.toString().trim();
        if(!username){
            if(user[data]){
                socket.write('請(qǐng)輸入密碼：');
                username = data;
            }else{
                socket.write('用戶名不對(duì)，請(qǐng)輸入用戶名：');
            }
        }else {
            if(user[username] === data){
                socket.write('登錄成功');
            }else {
                socket.write('密碼不對(duì)，請(qǐng)輸入密碼：');
            }
        }
    });
    socket.on('close',data=>{
        console.log(data);
    })
})

server.listen(8899,()=>{
    console.log('服務(wù)器監(jiān)聽(tīng)8899端口中')
})