NodeJS使用formidable实现文件上传

1.创建app.js主文件

const express = require('express');
const router = require('./router');
const path = require('path');
const bodyParser = require('body-parser');
 
const app = express();
 
//静态资源服务
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');
 
//配置解析普通表单post请求体
app.use(bodyParser.urlencoded({extended:false}));
 
//加载路由系统
app.use(router);
 
app.listen(3000, '127.0.0.1', () => {
 console.log('server is running at port 3000.');
})

2.html文件中的form表单
add.html文件：

<form action="/add" method="post" enctype="multipart/form-data">
 <div class="form-group">
 <label for="title">标题</label>
 <input type="text" class="form-control" id="title" name="title" placeholder="请输入音乐标题">
 </div>
 <div class="form-group">
 <label for="artist">歌手</label>
 <input type="text" class="form-control" id="singer" name="singer" placeholder="请输入歌手名称">
 </div>
 <div class="form-group">
 <label for="music_file">音乐</label>
 <input type="file" id="music" name="music" accept="audio/*">
 <p class="help-block">请选择要上传的音乐文件.</p>
 </div>
 <div class="form-group">
 <label for="image_file">海报</label>
 <input type="file" id="poster" name="img" accept="image/*">
 <p class="help-block">请选择要上传的音乐海报.</p>
 </div>
 <button type="submit" class="btn btn-success">点击添加</button>
 </form>

注意：method="post" enctype="multipart/form-data"

3.创建路由router.js文件

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文件中的依赖不用多说。

4.创建handler.js文件

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;//上传文件的保存路径
 form.keepExtensions = true;//保存扩展名
 form.maxFieldsSize = 20 * 1024 * 1024;//上传文件的最大大小
 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('/');
 })
 })
};