Nodejs学习总结 -Express 登陆注册示例（二）

时间  2019-11-21
标签 nodejs 学习 总结 express 登陆 注册 示例 繁體版
原文   原文链接

项目建立后，咱们来作个登陆注册实例，详细操做步骤以下。javascript

一、新建项目demo ，具体操做步骤参考上一章内容css

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

二、添加mysql和session包java

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

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

  • 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 mysql

三、app.js 添加session配置jquery

var session = require('express-session');sql

// 设置 Session  数据库

//位置必须写在app.use('/', routes);前，不然下面中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失效过时
     resave: false,
     saveUninitialized: true,
}));express

四、建立数据库及用户表

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';
View Code

五、新建models文件夹，建立user.js文件  用户数据库链接池链接及用户登陆注册方法

var mysql = require('mysql');

var DB_NAME= 'nodedb';

//建立链接池 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
  });
//能够监听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);
    });
  });
};


//根据用户名获得用户数量
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;
View Code

六、页面目录及详细代码

index 登陆及注册连接跳转

main 登陆成功系统界面 调用session显示登陆用户信息

regist 注册

index.html

<!DOCTYPE html>
<html>
  <head>
    <title>登陆界面</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="登陆"  />
          <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>
View Code

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表单提交的登陆数据
    var username = req.body.username;
    var password = req.body.password;
    var loginUser = new User({
      username : username,
      userpwd : password
    });
    //经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  演示没作加密，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;
View Code

main.html

<!DOCTYPE html>
<html>
  <head>
    <title>系统界面</title>
    <link rel='stylesheet' href='/stylesheets/style.css' />
    <script src="/javascripts/jquery.min.js" type="text/javascript"></script>
  </head>
  <body>
    欢迎  <%= username %>
  </body>
View Code

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;
View Code

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='/' >登陆</a>
    </div>
    <%} %>
    </form>
  </body>
</html>
View Code

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;
View Code

 

代码下载地址：

http://download.csdn.net/detail/caiping07/9618977 

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