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Nodejs+express makes file upload

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Release： 2018-06-15 14:40:37

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This time I will bring you nodejs express to upload files. What are the precautions for nodejs express to upload files? The following is a practical case, let’s take a look.

The example in this article describes how nodejs implements file upload based on express. I would like to share it with you for your reference. The details are as follows:

When I was working on a personal project some time ago, I used the nodejs server to upload files. Now I will summarize this as a record.

When I upload files, I use express's multiparty. Of course, it can also be implemented using the connect-multiparty middleware, but the official does not seem to recommend the use of connect-multiparty middleware. Without further ado, let’s look at the code below.

Steps:

(1) Use express to create a project. The jade template engine is used by default, but I am still used to html, so I changed it to html template.
(2) In the project directory, install the necessary components through npm install multiparty.
(3) Modify views/index.html and add a file upload form.

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>上传文件</title>
</head>
<body>
  上传文件
  <form method=&#39;post&#39;, action=&#39;/file/uploading&#39;, enctype=&#39;multipart/form-data&#39;>
    <input type="file" name="inputFile">
    <input type="submit" value="上传">
  </form>
</body>
</html>

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(4) Modify routes/index.js to implement the background code for uploading pages and uploading responses.

var express = require('express');
var router = express.Router();
var multiparty = require('multiparty');
var util = require('util');
var fs = require('fs');
/* 上传页面. */
router.get('/', function(req, res, next) {
 //res.render('./views/index');
 res.sendfile('./views/index.html');
});
/* 上传 */
router.post('/file/uploading', function(req, res, next) {
  /* 生成multiparty对象，并配置上传目标路径 */
  var form = new multiparty.Form();
  /* 设置编辑 */
  form.encoding = 'utf-8';
  //设置文件存储路劲
  form.uploadDir = './public/files';
  //设置文件大小限制
  form.maxFilesSize = 2 * 1024 * 1024;
  // form.maxFields = 1000;  //设置所有文件的大小总和
  //上传后处理
  form.parse(req, function(err, fields, files) {
    var filesTemp = JSON.stringify(files, null, 2);
    if(err) {
      console.log('parse error:' + err);
    }else {
      console.log('parse files:' + filesTemp);
      var inputFile = files.inputFile[0];
      var uploadedPath = inputFile.path;
      var dstPath = './public/files' + inputFile.originalFilename;
      //重命名为真实文件名
      fs.rename(uploadedPath, dstPath, function(err) {
        if(err) {
          console.log('rename error:' + err);
        }else {
          console.log('rename ok');
        }
      })
    }
    res.writeHead(200, {'content-type': 'text/plain;charset=utf-8'});
    res.write('received upload:\n\n');
    res.end(util.inspect({fields: fields, files: filesTemp}))
  })
})
module.exports = router;

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!