Nodejs学习总结 -Express 登录注册示例（二）

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';

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;

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

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>

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;

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>

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;

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>

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;

代码下载地址：

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

巴特西

Nodejs学习总结 -Express 登录注册示例（二）

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