文件上传速成版4.0：req.files未定义 [英] File uploading with Express 4.0: req.files undefined

问题描述

我试图获得一个简单的文件上传机制与Express 4.0工作，但我不断获得未定义为 req.files 在 app.post 正文中。以下是相关代码：

  var bodyParser = require（'body-parser'）; 
 var methodOverride = require（'method-override'）; 
 // ... 
 app.use（bodyParser（{uploadDir：path.join（__ dirname，'files'），keepExtensions：true}））; 
 app.use（methodOverride（））; 
 // ... 
 app.post（'/ fileupload'，function（req，res）{
 console.log（req.files）; 
 res.send 'ok'）; 
}）; 
  

和随附的玉代码：

  form（name =uploader，action =/ fileupload，method =post，enctype =multipart / form-data）
 input file，name =file，id =file）
 input（type =submit，value =Upload）
  

解决方案

感谢 mscdex ，我已经切换到使用 busboy 而不是 bodyParser ：

  var fs = require（'fs'）; 
 var busboy = require（'connect-busboy'）; 
 // ... 
 app.use（busboy（））; 
 // ... 
 app.post（'/ fileupload'，function（req，res）{
 var fstream; 
 req.pipe（req.busboy）; 
 req.busboy.on（'file'，function（fieldname，file，filename）{
 console.log（上传：+ filename）; 
 fstream = fs.createWriteStream（__ dirname + '/ files /'+ filename）; 
 file.pipe（fstream）; 
 fstream.on（'close'，function（）{
 res.redirect（'back'）; 
}）; 
}）; 
}）; 
  

解决方案

body-parser 模块只处理JSON和urlencoded表单提交，而不是multipart如果你正在上传文件，那么你可以使用 connect-busboy 或 multer 或 connect-multiparty （多方/强大是最初在express bodyParser中间件中使用的）。另外FWIW，我正在一个更高级别的层面上，名叫 code> 。它配有Express中间件，也可以单独使用。

I'm attempting to get a simple file upload mechanism working with Express 4.0 but I keep getting undefined for req.files in the app.post body. Here is the relevant code:

var bodyParser = require('body-parser');
var methodOverride = require('method-override');
//...
app.use(bodyParser({ uploadDir: path.join(__dirname, 'files'), keepExtensions: true })); 
app.use(methodOverride()); 
//...
app.post('/fileupload', function (req, res) {
  console.log(req.files); 
  res.send('ok'); 
}); 

.. and the accompanying Jade code:

form(name="uploader", action="/fileupload", method="post", enctype="multipart/form-data")
    input(type="file", name="file", id="file")
    input(type="submit", value="Upload")

Solution
Thanks to the response by mscdex below, I've switched to using busboy instead of bodyParser:

var fs = require('fs');
var busboy = require('connect-busboy');
//...
app.use(busboy()); 
//...
app.post('/fileupload', function(req, res) {
    var fstream;
    req.pipe(req.busboy);
    req.busboy.on('file', function (fieldname, file, filename) {
        console.log("Uploading: " + filename); 
        fstream = fs.createWriteStream(__dirname + '/files/' + filename);
        file.pipe(fstream);
        fstream.on('close', function () {
            res.redirect('back');
        });
    });
});

解决方案

The body-parser module only handles JSON and urlencoded form submissions, not multipart (which would be the case if you're uploading files).

For multipart, you'd need to use something like connect-busboy or multer or connect-multiparty (multiparty/formidable is what was originally used in the express bodyParser middleware). Also FWIW, I'm working on an even higher level layer on top of busboy called reformed. It comes with an Express middleware and can also be used separately.

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