Node.js_ express.Router 路由器

Node.js_ express.Router 路由器_模块化管理路由

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 {
     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 {
     260px;
    display: flex;
    justify-content: space-between;
    margin: 20px 0;
    font-size: 18px;
    line-height: 32px;
}

.clothes>label{
     80px;
    text-align: center;
}

.clothes>input{
     170px;
    height: 32px;
}

button {
     100%;
    height: 100%;
    
    font-size: 16px;
    background-color: #c4ceda;
    cursor: pointer;
}

.clothes .btn{
     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:'

服务器已启动: http://localhost:3000
Hunting Happy!'));