NodeJS uses formidable to implement file upload-JS Tutorial-php.cn

NodeJS uses formidable to implement file upload

高洛峰

Release： 2016-12-08 16:16:42

Original

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I recently learned NodeJS by myself, and then made a small demo to implement the functions of adding, modifying, playing and deleting songs. Of course, the function of uploading music and pictures must be implemented. So I searched for information online and found a formidable plug-in, which can implement the file upload function very well. This small demo uses the MySQL database, and all data is stored in the database. Here's a brief explanation of how to use it.

1. Create the main app.js file

const express = require(&#39;express&#39;);
const router = require(&#39;./router&#39;);
const path = require(&#39;path&#39;);
const bodyParser = require(&#39;body-parser&#39;);
 
const app = express();
 
//静态资源服务
app.use(&#39;/uploads&#39;, express.static(path.join(__dirname, &#39;uploads&#39;)));
app.use(&#39;/node_modules&#39;, express.static(path.join(__dirname, &#39;node_modules&#39;)));
 
//配置模板引擎
app.set(&#39;views&#39;, path.join(__dirname, &#39;views&#39;));
app.engine(&#39;.html&#39;, require(&#39;ejs&#39;).renderFile);
app.set(&#39;view engine&#39;, &#39;html&#39;);
 
//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, &#39;127.0.0.1&#39;, () => {
  console.log(&#39;server is running at port 3000.&#39;);
})

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2.html form form in the
add.html file:

<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>

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

3. Create the router.js file

const express = require(&#39;express&#39;);
const router = express.Router();
const handler = require(&#39;./handler&#39;);
  
router
  .get(&#39;/&#39;, handler.showIndex)
  .get(&#39;/musicList&#39;, handler.getMusicList)
  .get(&#39;/add&#39;, handler.showAdd)
  .post(&#39;/add&#39;, handler.doAdd)
  .get(&#39;/edit&#39;, handler.showEdit)
  .post(&#39;/edit&#39;, handler.doEdit)
  .get(&#39;/remove&#39;, handler.doRemove)
  
module.exports = router;

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Note: It goes without saying that the dependencies in the router.js file go without saying.

4. Create handler.js file

const formidable = require(&#39;formidable&#39;);
const config = require(&#39;./config&#39;);
const db = require(&#39;./common/db&#39;);
const path = require(&#39;path&#39;);
const fs = require(&#39;fs&#39;);
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(&#39;INSERT INTO music (title,singer,music,img) VALUES (?,?,?,?)&#39;, [
      title,
      singer,
      music,
      img
    ], (err, rows) => {
      if (err) {
        throw err;
      }
      res.redirect(&#39;/&#39;);
    })
  })
};

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