This article continues to deepen the usage of express in node.js. It mainly introduces the method of nodejs using express to obtain get and post values and session verification. It analyzes nodejs using express to obtain get and post values and session verification based on the example form. Friends who need it can refer to the specific operation steps and precautions of the function. I hope it can help everyone.
Get the values passed by get and post
The value passed by get is put into an object
req.query
The passed value of post is put into
req.body
The acquisition method is the same as the method of obtaining the content of the object. For example, if an id value is passed in earlier, nodejs can obtain it by req.body.id
express session verification
The first step is to install the cookie and session modules and introduce
var session = require('express-session'); var cookieParser = require('cookie-parser');
The second step is to express application cookies and session
app.use(cookieParser()); app.use(session({ resave: true, // don't save session if unmodified saveUninitialized: false, // don't create session until something stored secret: 'admin', //密钥 name: 'testapp', //这里的name值得是cookie的name,默认cookie的name是:connect.sid cookie: { maxAge: 80000 } //设置maxAge是80000ms,即80s后session和相应的cookie失效过期 }));
The third step, when requesting, intercept and process
app.use(function(req, res, next) { if (!req.session.user) { if (req.url == "/login") { next(); //如果请求的地址是登录则通过,进行下一个请求 } else { res.redirect('/login');//跳转到登录页面 } } else if (req.session.user) { next();//如果已经登录,则可以进入 } });
If you are not logged in when accessing the page now, the routing will automatically point to the /login page. The last step is to route It deals with
app.get('/login', function(req, res) { res.render("login"); }); app.post('/login', function(req, res) { if (req.body) {//判断时候有传值 var user = { 'username': req.body.username//获取用户名并赋值,这里之前可以自己做判断 }; req.session.user = user;//赋值session,自动跳转页面 res.redirect('/admin'); } else { res.redirect('/login'); } }); app.get('/logout', function(req, res) {//做的登出页面 req.session.user = null; res.redirect('/login'); });
Related recommendations:
Detailed explanation of node.js using websocket based on express
Detailed explanation of Node.js using Express.Router
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