nodejs之express框架商品管理系统登录功能

npm install express --save

npm install body-parser --save

npm install express-session --save

npm install ejs --save

npm install mongodb-connect --save

//安装express//安装ejs//https://docs.mongodb.com/getting-started/node/query/var express=require(‘express‘);var app=new express(); ?/*实例化*///获取postvar bodyParser = require(‘body-parser‘);// 设置body-parser中间件app.use(bodyParser.urlencoded({ extended: false }));app.use(bodyParser.json());/*mongodb连接设置*/const ?MongoClient = require(‘mongodb‘).MongoClient;const dburl = ‘mongodb://localhost:27017‘;const dbName = ‘test‘;const client = new MongoClient(dburl);/**///保存用户信息var session = require("express-session");//配置中间件 ?固定格式app.use(session({ ???secret: ‘keyboard cat‘, ???resave: false, ???saveUninitialized: true, ???cookie: { ???????maxAge:1000*60*30 //三十分钟 ???}, ???rolling:true}))//使用ejs模板引擎 ??默认找views这个目录app.set(‘view engine‘,‘ejs‘);//配置public目录为我们的静态资源目录app.use(express.static(‘public‘));//ejs中 设置全局数据 ??所有的页面都可以使用//app.locals[‘userinfo‘]=‘1213‘//app.locals[‘userinfo‘]=‘111111‘;//自定义中间件 ?判断登录状态app.use(function(req,res,next){ ???//console.log(req.url); ???//next(); ???if(req.url==‘/login‘ || req.url==‘/doLogin‘){ ???????next(); ???}else{ ???????if(req.session.userinfo&&req.session.userinfo.username!=‘‘){ ??/*判断有没有登录*/ ???????????app.locals[‘userinfo‘]=req.session.userinfo; ??/*配置全局变量 ?可以在任何模板里面使用*/ ???????????next(); ???????}else{ ???????????res.redirect(‘/login‘) ???????} ???}})app.get(‘/‘,function(req,res){ ???res.send(‘index‘);})//登录app.get(‘/login‘,function(req,res){ ???//res.send(‘login‘); ???res.render(‘login‘);})//获取登录提交的数据app.post(‘/doLogin‘,function(req,res){ ???console.log(req.body); ???/*获取post提交的数据*/ ???//req.body ={ username: ‘admin‘, password: ‘123456‘ } ???//1.获取数据 ???//2.连接数据库查询数据 ???var list = []; ???client.connect(function (err) { ???????if (err) {//连接失败 ???????????console.log("Connected fail to server"); ???????} ???????//连接成功 ???????console.log("Connected successfully to server"); ???????const db = client.db(dbName); ???????var result = db.collection(‘user‘).find(req.body); ???????result.toArray(function (err,data) { ???????????if(data.length>0){ ???????????????????//登陆成功 ???????????????req.session.userinfo=data[0]; ???????????????//res.render(‘product‘); ???????????????res.redirect(‘/product‘); ???????????????}else { ???????????????????//登陆失败 ???????????????????res.send("<script>alert(‘登陆失败‘);location.href=‘/login‘</script>") ???????????????} ???????}) ???});})app.get(‘/product‘,function(req,res){ ???res.render(‘product‘,{ ???});})app.get(‘/productadd‘,function(req,res){ ???res.render(‘productadd‘);})app.get(‘/productedit‘,function(req,res){ ???res.render(‘productedit‘);})app.get(‘/productdelete‘,function(req,res){ ???res.send(‘productdelete‘);})app.get(‘/loginOut‘,function(req,res){ ???//销毁session ???req.session.destroy(function(err){ ???????if(err){ ???????????console.log(err); ???????}else{ ???????????res.redirect(‘/login‘); ???????} ???})})app.listen(3003,‘127.0.0.1‘);

body-parser：获取post请求数据//使用ejs模板引擎 ??默认找views这个目录app.set(‘view engine‘,‘ejs‘);//配置public目录为我们的静态资源目录app.use(express.static(‘public‘));//ejs中 设置全局数据 ??所有的页面都可以使用app.locals[‘userinfo‘]=‘1213‘