app_session_file.js

var express = require('express');
var session = require('express-session');
var FileStore = require('session-file-store')(session);
var bodyParser = require('body-parser');
var app = express();
app.use(bodyParser.urlencoded({extended: false}));
app.use(session({
  secret: '1234564546@$skjdljasaaads',
  resave: false,    //세션 id를 새로 만드는 것.
  saveUninitialized: true,  //세션 id를 세션을 실행하기 전까지 발급하지 않음
  store: new FileStore()
}));
app.get('/count',function(req,res){
  if(req.session.count){
    req.session.count++;
  } else{
      req.session.count = 1;
  }

  res.send('count : ' + req.session.count);
});
app.get('/tmp',function(req,res){
  res.send('result : ' + req.session.count);
});
app.get('/auth/logout',function(req,res){
   req.session.destroy();   //세션 삭제
  res.redirect('/welcome');
});
app.get('/welcome',function(req,res){
  if(req.session.displayName){
    res.send(`
      <h1>Hello, ${req.session.displayName}</h1>
      <a href="/auth/logout">logout</a>
      `);
  } else{
    res.send(`
      <h1>Welcome</h1>
      <a href="/auth/login">Login</a>
      `)

  }
});
app.post('/auth/login', function(req,res){
  var user = {
    username:'egoing',
    password:'111',
    displayName:'Egoing'
  };
  var uname = req.body.username;
  var pwd = req.body.password;
  if(uname === user.username && pwd === user.password){
    req.session.displayName = user.displayName;
    res.redirect('/welcome');
  } else{
    res.send('Who are you? <a href="/auth/login">login</a>');
  }
});
app.get('/auth/login', function(req,res){
  var output = `
  <h1>Login</h1>
  <form action = "/auth/login" method = "post">
    <p>
      <input type = "text" name = "username" placeholder = "username">
    </p>
    <p>
      <input type = "password" name="password" placeholder = "password">
    </p>
    <p>
      <input type ="submit">
    </p>
  </form>
  `;

  res.send(output);
});
app.listen(3003,function(){
  console.log('Connected 3003 port!!!');
});