Node.js_ express.Router 路由器

路由器 express.Router

路由器模块化管理路由

基本使用：
路由模块

1. 引入 express

const express = require('express');

其他相关模块

const sha1 = require('sha1');

const tableModel= require('models');

const {resolve} = require(path);

2. 创建路由器对象

const router = new express.Router();

3. 写 router.post() 或者 router.get()

4. 暴露本模块的路由

module.exports = router;

index.js 主模块使用 app.use(中间件) 使用

1. 引入路由器模块

const uiRouter = require('./routers/uiRouter');

const userRouter = require('./routers/userRouter');

2. 应用路由器

app.use(uiRouter);

app.use(userRouter);

源代码实例（登录/注册）

package.json

{

  "name": "node_express",

  "version": "1.0.0",

  "main": "index.js",

  "license": "MIT",

  "dependencies": {

    "express": "^4.16.4",

    "mongoose": "^5.4.0"

  }

}

templates/login.html

<!DOCTYPE html>

<html>

    <head>

        <meta charset="UTF-8"/>

        <title>用户登录</title>

        <link rel="stylesheet" type="text/css" href="css/index.css"/>

    </head>

    <body>

        <div id="outer_box" class="login">

            <h2>用户登录</h2>

            <form action="http://localhost:3000/login" method="post">

                <div class="clothes">

                    <label for="input_name">用&nbsp;户&nbsp;名</label>

                    <input id="input_name" type="text" name="user_name" placeholder="请输入用户名" />

                </div>

                <div class="clothes">

                    <label for="input_pwd">密&nbsp;&nbsp;&nbsp;码</label>

                    <input id="input_pwd" type="password" name="user_pwd" placeholder="请输入密码" />

                </div>

                <div class="clothes">

                    <a class="btn" href="http://localhost:3000/register">

                        <button type="button">注册</button>

                    </a>

                    <button class="login btn" type="submit">登录</button>

                </div>

            </form>

        </div>

    </body>

</html>

templates/register.html

<!DOCTYPE html>

<html>

    <head>

        <meta charset="UTF-8"/>

        <title>用户注册</title>

        <link rel="stylesheet" type="text/css" href="css/index.css"/>

    </head>

    <body>

        <div id="outer_box" class="register">

            <h2>用户注册</h2>

            <form action="http://localhost:3000/register" method="post">

                <div class="clothes">

                    <label for="input_name">用&nbsp;户&nbsp;名</label>

                    <input id="input_name" type="text" name="user_name" placeholder="请输入用户名" />

                </div>

                <div class="clothes">

                    <label for="input_pwd">密&nbsp;&nbsp;&nbsp;码</label>

                    <input id="input_pwd" type="password" name="user_pwd" placeholder="请输入密码" />

                </div>

                <div class="clothes">

                    <label for="input_repeat_pwd">确认密码</label>

                    <input id="input_repeat_pwd" type="password" name="user_repeat_pwd" placeholder="请再次输入密码" />

                </div>

                <div class="clothes">

                    <label for="input_email">注册邮箱</label>

                    <input id="input_email" type="text" name="user_email" placeholder="请输入邮箱地址" />

                </div>

                <div class="clothes">

                    <button class="register btn" type="submit">注册</button>

                    <a class="btn" href="http://localhost:3000/login">

                        <button type="button">登录</button>

                    </a>

                </div>

            </form>

        </div>

    </body>

</html>

templates/css/index.css

body {

    width: 100%;

    height: 100%;

    color: #000;

    background: #b9c2a4;

    background-size: cover; /* 指定背景图片大小 */

}

/*************************************************/

#outer_box {

    position: absolute;

    top: 50%;

    left: 50%;

    transform: translate(-50%, -50%);

    color: #1a45c3;

}

#outer_box.login {

    color: #9e098b;

}

#outer_box.register {

    color: #1a45c3;

}

#outer_box>h2{

    padding-bottom: 40px;

    margin-left: -50px;

}

.clothes {

    width: 260px;

    display: flex;

    justify-content: space-between;

    margin: 20px 0;

    font-size: 18px;

    line-height: 32px;

}

.clothes>label{

    width: 80px;

    text-align: center;

}

.clothes>input{

    width: 170px;

    height: 32px;

}

button {

    width: 100%;

    height: 100%;

    font-size: 16px;

    background-color: #c4ceda;

    cursor: pointer;

}

.clothes .btn{

    width: 64px;

    height: 32px;

    margin: 0 20px;

}

.clothes button.register{

    background-color: #1a45c3;

    color: #fff;

}

.clothes button.login{

    background-color: #9e098b;

    color: #fff;

}

routers/get/index_router.js

const express = require('express');

const {resolve} = require('path');

const indexRouter = new express.Router();

/************************ get ***********************/

indexRouter.get('/', (request, response)=>{

    response.sendFile(resolve(__dirname, '../../templates/login.html'));

});

indexRouter.get('/login', (request, response)=>{

    response.sendFile(resolve(__dirname, '../../templates/login.html'));

});

indexRouter.get('/register', (request, response)=>{

    response.sendFile(resolve(__dirname, '../../templates/register.html'));

});

module.exports = indexRouter;

routers/post/form_router.js

const express =  require('express');

const sha1 =  require('sha1');

const promiseConnect = require('../../db/connectDB.js');

const userInfoModel = require('../../models/userModel.js');

const formRouter = new express.Router();

/************************ post ***********************/

let logged = false ;

promiseConnect.then(async result=>{

    console.log(result);

    formRouter.post('/register', async (request, response)=>{

        const {

            user_name:uName,

            user_pwd:uPwd,

            user_repeat_pwd:urePwd,

            user_email:uEmail,

        } = request.body;    /**** 解构赋值 ****/

        userInfo = {

            "userName": uName,

            "userPassword": uPwd,

            "userEmail": uEmail

        };

        let errInfo = {};

        if(urePwd !== uPwd){

            errInfo.repeatPassword = '两次输入不一致';

        };

        if(!(/^[a-zA-Z][a-zA-Z0-9_]{5,20}$/.test(uName))){

            errInfo.name = '用户名不合法';

        };

        if(!(/^[a-zA-Z0-9_]{6,20}$/.test(uPwd))){

            errInfo.password = '密码不合法';

        };

        if(!(/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/.test(uEmail))){

            errInfo.email = '邮箱不合法';

        };

        const badEmail = await userInfoModel.findOne({"userEmail": uEmail});

        if(badEmail){

            errInfo.emailRegistered = '邮箱已被注册';

        };

        if(errInfo.repeatPassword || errInfo.name || errInfo.password || errInfo.email){

            response.send(errInfo);

            return;

        };

        const fond = await userInfoModel.findOne({"userName": uName});

        if(fond){

            response.send({"error":'用户名已被注册'});

        }else{

            userInfo.userPassword = sha1(userInfo.userPassword);

            await userInfoModel.create(userInfo);

            response.redirect('/login');    // http://localhost:3000/login

        };

    });

    formRouter.post('/login',async (request, response)=>{

        logged = false;

        let uName = request.body['user_name'];

        let uPwd = request.body['user_pwd'];

        userInfo = {

            "userName": uName,

            "userPassword": uPwd

        };

        if(!(/^[a-zA-Z][a-zA-Z0-9_]{5,20}$/.test(uName))){

            logged = false;    // 用户名不存在

        }else if(!(/^[a-zA-Z0-9_]{6,20}$/.test(uPwd))){

            logged = false;    // 密码错误

        };

        const findName = await userInfoModel.findOne({"userName": uName});

        const findPwd = await userInfoModel.findOne({"userPassword": sha1(uPwd)});

        if(findName && findPwd){

            logged = true;

        };

        response.send(logged?{"success":'登录成功'}:{"error":'用户名或密码错误'});

    });

}).catch(err=>console.log(err));

module.exports = formRouter;

db/connectDB.js

const mongoose = require('mongoose');

module.exports = new Promise((resolve, reject)=>{

    mongoose.connect('mongodb://localhost:27017/user_database', {useNewUrlParser:true})

    mongoose.connection.once('open', err=>{

        if(err){

            console.log(err);

            reject(err);

        }else{

            resolve('数据库已连接');

        };

    });

});

models/userModel.js

const mongoose = require('mongoose');

const Schema = mongoose.Schema;

const fieldSchema = new Schema({

    "userName": {

        "type": String,

        "unique": true,

        "required": true

    },

    "userPassword": {

        "type": String,

        "required": true

    },

    "userEmail": {

        "type": String,

        "unique": true,

        "required": true

    },

    "createTime": {

        "type": Date,

        "default": Date.now()

    }

});

module.exports = mongoose.model("user_info", fieldSchema);

index.js

const express =  require('express');

const app = express();

const indexRouter = require('./routers/get/index_router.js');

const formRouter = require('./routers/post/form_router.js');

/*********************** 中间件 **********************/

// 暴露路由 login.html register.html

app.use(express.static('templates'));    // 默认调用 next();

// 将 用户输入的数据 挂载到 请求体 request.body  上

app.use(express.urlencoded({extended: true}));    // 默认调用 next();

app.use(indexRouter);

app.use(formRouter);

/**************** 端口号 3000, 启动服务器 ***************/

app.listen(3000, err=>console.log(err?err:'\n\n服务器已启动: http://localhost:3000\nHunting Happy!'));

巴特西

Node.js_ express.Router 路由器_模块化管理路由

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