1.建立app.js主檔案

const express = require('express');
const router = require('./router');
const path = require('path');
const bodyParser = require('body-parser');

const app = express();

//靜態資源服務
app.use('/uploads', express.static(path.join(__dirname, 'uploads')));
app.use('/node_modules', express.static
 
(path.join(__dirname, 'node_modules')));

//配置模板引擎
app.set('views', path.join(__dirname, 'views'));
app.engine('.html', require('ejs').renderFile);
app.set('view engine', 'html');

//配置解析普通表單post請求體
app.use(bodyParser.urlencoded({extended:false}));

//載入路由系統
app.use(router);

app.listen(3000, '127.0.0.1', () =>
 
 {
    console.log('server is running at port 3000.');
})

2.html檔案中的form表單

add.html檔案：

<form action="/add" method="post" enctype="multipart/form-data"> 
      <div class="form-group">
        <label for="title">標題</label>
        <input type="text" class="form-control" id
 
="title" name="title" placeholder="請輸入音樂標題">
      </div>
      <div class="form-group">
        <label for="artist">歌手</label>
        <input type="text" class="form-control" id="singer" name="singer" placeholder="請輸入歌手名稱">
      </div>
      <div class="form-group">
        <label for="music_file">音樂</label>
        <input type="file" id="music" name="music" accept="audio/*">
        <p class="help-block">請選擇要上傳的音樂檔案.</p>
      </div>
      <div class="form-group">
        <label for="image_file">海報</label>
        <input type="file" id="poster" name="img" accept="image/*">
        <p class="help-block">請選擇要上傳的音樂海報.</p>
      </div>
      <button type="submit" class="btn btn-success">點選新增</button>
</form>

注意：method=“post” enctype=“multipart/form-data”

3.建立路由router.js檔案

const express = require('express');
const router = express.Router();
const handler = require('./handler');
 
router
    .get('/', handler.showIndex)
    .get('/musicList', handler.getMusicList)
    .get('/add', handler.showAdd)
    .post('/add', handler.doAdd)
    .get('/edit', handler.showEdit)
    .post('/edit', handler.doEdit)
    .get('/remove', handler.doRemove)
 
module.exports = router;

注意：router.js檔案中的依賴不用多說。

4.建立handler.js檔案

const formidable = require('formidable');
const config = require('./config');
const db = require('./common/db');
const path = require('path');
const fs = require('fs');
exports.doAdd = (req, res) => {
    const form = new formidable.IncomingForm();
    form.uploadDir = config.uploadDir;//上傳檔案的儲存路徑
    form.keepExtensions = true;//儲存副檔名
    form.maxFieldsSize = 20 * 1024 * 1024;//上傳檔案的最大大小
    form.parse(req, (err, fields, files) => {
        if (err) {
            throw err;
        }
        const title = fields.title;
        const singer = fields.singer;
        const music = path.basename(files.music.path);
        const img = path.basename(files.img.path);
        db.query('INSERT INTO music (title,singer,music,img) VALUES (?,?,?,?)', [
            title,
            singer,
            music,
            img
        ], (err, rows) => {
            if (err) {
                throw err;
            }
            res.redirect('/');
        })
    })
};

參考:formidable官網