Nodejs学习总结 -Express 登录注册实例（二）

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Nodejs学习总结 -Express 登录注册实例（二）

2024-08-11 15:22:27 217人阅读

项目创建后，我们来做个登录注册实例，详细操作步骤如下。

1、新建项目demo ，具体操作步骤参考上一章内容

https://www.cnblogs.com/Anlycp/

2、添加mysql和session包

package.json dependencies中添加下面内容后输入npm install进行安装

"mysql": "latest",
"express-session" : "latest",

输入下面语句进行和上面功能相同（多个安装包空格隔开）

npm install mysql express-session –save

3、app.js 添加session配置

var session = require(‘express-session‘);

// 设置 Session

//位置必须写在app.use(‘/‘, routes);前，否则下面中req.session.user 赋值时会报 TypeError: Cannot set property ‘user‘ of undefined错误
app.use(session({
     secret: ‘12345‘,
     name: ‘demo‘,   //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
     resave: false,
     saveUninitialized: true,
}));

4、创建数据库及用户表

CREATE DATABASE IF NOT EXISTS nodedb CHARACTER SET UTF8;USE nodedb;SET FOREIGN_KEY_CHECKS=0;DROP TABLE IF EXISTS `userinfo`;CREATE TABLE `userinfo` (`userid` int(11) NOT NULL AUTO_INCREMENT COMMENT ‘主键‘,`username` varchar(64) NOT NULL COMMENT ‘用户名‘,`userpwd` varchar(64) NOT NULL COMMENT ‘用户密码‘,PRIMARY KEY (`userid`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT=‘用户信息表‘;

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5、新建models文件夹，创建user.js文件用户数据库连接池连接及用户登录注册方法

var mysql = require(‘mysql‘);var DB_NAME= ‘nodedb‘;//创建连接池 createPool(Object)// Object和createConnection参数相同。var pool = mysql.createPool({      host : ‘127.0.0.1‘,      user : ‘root‘,      password :‘caip‘,      database:‘nodedb‘,      port : 3306  });//可以监听connection事件，并设置session值pool.on(‘connnection‘,function(connection){  console.log("pool on");  connection.query(‘SET SESSION auto_increment_increment=1‘)});function User(user){  this.username = user.username;  this.userpwd = user.userpwd;}User.prototype.userSave = function save(callback){  var user = {    username : this.username,    userpwd : this.userpwd  };  var INSERT_USER= "INSERT INTO USERINFO (USERID,USERNAME,USERPWD) VALUES (0,?,?)";  pool.getConnection(function(err,connection){    connection.query(INSERT_User,[user.username,user.userpwd],function(err,result){      if(err){        console.log("INSERT_USER Error: " + err.message);        return;      }      connection.release();      callback(err,result);    });  });};//根据用户名得到用户数量User.prototype.userNum = function(username, callback) {  pool.getConnection(function(err,connection){    console.log("getConnection");    console.log("getUserNumByName");    var SELECT_NUM = "SELECT COUNT(1) AS num FROM USERINFO WHERE USERNAME = ?";    connection.query(QUERY_Num, [username], function (err, result) {      if (err) {        console.log("SELECT_NUM Error: " + err.message);        return;      }      connection.release();      callback(err,result);    });  });};User.prototype.userInfo = function(callback){  var user = {    username : this.username,    userpwd : this.userpwd  };  var SELECT_LOGIN ="SELECT * FROM USERINFO WHERE USERNAME = ?";  pool.getConnection(function(err,connection){    connection.query(QUERY_LOGIN,[user.username],function(err,result){      if (err) {        console.log("SELECT_LOGIN Error: " + err.message);        return;      }      connection.release();      callback(err,result);    });  });}module.exports = User;

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6、页面目录及详细代码

index 登录及注册链接跳转

main 登录成功系统界面调用session显示登录用户信息

regist 注册

技术分享

index.html

<!DOCTYPE html><html>  <head>    <title>登录界面</title>    <link rel=‘stylesheet‘ href=‘/stylesheets/style.css‘ />  </head>  <body>    <form action="/" method="post">      <div class="form-group">          <div class="form-name left">            <label>用户名</label>          </div>          <input type="text" name="username" class="form-input left"/>      </div>      <div class="form-group">          <div class="form-name left">            <label>密码</label>          </div>          <input type="password" name="password" class="form-input left"/>      </div>      <div class="form-btn">          <input type="submit" value="登录"  />          <input type="button" value="注册" onclick="getRegist()" />      </div>      <div class="form-btn">        <label class="warn"><%=errMsg %></label>      </div>    </form>    <script type="text/javascript">      function getRegist(){        location.href = "/regist";      }    </script>  </body></html>

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index.js

var express = require(‘express‘);var router = express.Router();var User = require("../models/user.js");/* GET home page. */router.get(‘/‘, function(req, res, next) {  res.render(‘index‘,{ errMsg: ‘‘ });});router.post("/",function(req, res) {    //获取form表单提交的登录数据    var username = req.body.username;    var password = req.body.password;    var loginUser = new User({      username : username,      userpwd : password    });    //通过用户名取到用户信息    loginUser.userInfo(function(err,result){      if(err){        res.render(‘index‘, {errMsg: err });        return;      }      if(result == ‘‘){         res.render(‘index‘, {errMsg: ‘用户不存在‘ });         return;      }      else{        //判断用户密码是否填写正确  演示没做加密，等有时间再加        if(result[0][‘userpwd‘] == password){          var user = {‘username‘:username};          req.session.user = user;//保存用户session信息          res.redirect(‘/main‘);        }        else{           res.render(‘index‘, {errMsg: ‘密码有误‘ });        }      }     });});module.exports = router;

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main.html

<!DOCTYPE html><html>  <head>    <title>系统界面</title>    <link rel=‘stylesheet‘ href=http://www.mamicode.com/‘/stylesheets/style.css‘ />"/javascripts/jquery.min.js" type="text/javascript"></script>  </head>  <body>    欢迎  <%= username %>  </body>

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main.js

var express = require(‘express‘);var router = express.Router();/* GET home page. */router.get(‘/‘, function(req, res, next) {  var user = req.session.user;   res.render(‘main‘, { username:user.username});});module.exports = router;

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regist.html

<!DOCTYPE html><html>  <head>    <title>注册</title>    <link rel=‘stylesheet‘ href=‘/stylesheets/style.css‘ />  </head>  <body>    <form action="/regist" method="post">    <div class="form-group">        <div class="form-name left">          <label>用户名</label>        </div>        <input type="text" name="username" class="form-input left"/>    </div>    <div class="form-group">        <div class="form-name left">          <label>密码</label>        </div>        <input type="password" name="password" class="form-input left"/>    </div>    <div class="form-btn">        <input type="submit" value="注册"  />    </div>    <div class="form-btn">        <label class="warn"><%= errMsg %></label>    </div>    <% if(locals.status=="success"){ %>    <div class="form-btn">      注册成功，请点击<a href=‘/‘ >登录</a>    </div>    <%} %>    </form>  </body></html>

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regist.js

var express = require(‘express‘);var router = express.Router();var User = require("../models/user.js");/* GET home page. */router.get(‘/‘, function(req, res, next) {  res.render(‘regist‘, {errMsg:""});});router.post(‘/‘,function(req, res) {    var username = req.body.username;    var password = req.body.password;    var newUser = new User({      username : username,      userpwd : password    });    //检查用户名是否已经存在    newUser.userNum(newUser.username, function (err, results) {      if (results != null && results[0][‘num‘] > 0) {        err = ‘用户名已存在‘;      }      if (err) {        res.render(‘regist‘, {errMsg: err });        return;      }      newUser.userSave(function(err,result){        if(err){          res.render(‘regist‘, {errMsg: err });          return;        }        if(result.insertId > 0){          res.locals.status = "success";          res.render(‘regist‘, {errMsg:‘‘ });        }        else{          res.render(‘regist‘, {errMsg: err });        }       });    });});module.exports = router;

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Nodejs学习总结 -Express 登录注册实例（二）

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Nodejs学习总结 -Express 登录注册实例（二）

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