使用 Express 4.0 上传文件:req.files 未定义

问题描述

我正在尝试使用 Express 4.0 获得一个简单的文件上传机制，但我一直在 app.postreq.files 获取 undefined/代码> 身体.相关代码如下:

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');
});

.. 以及随附的 Pug 代码:

.. and the accompanying Pug code:

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

解决方案
感谢下面 mscdex 的回应，我已经改用 busboy 而不是 bodyParser:

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');
        });
    });
});

推荐答案

body-parser 模块只处理 JSON 和 urlencoded 表单提交，而不是 multipart(如果你上传文件就是这种情况).

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

对于多部分，您需要使用类似connect-busboy 或 multer 或 connect-multiparty(multiparty/formidable 最初用于 express bodyParser 中间件).同样 FWIW，我正在 busboy 之上开发一个更高级别的层，称为 reformed.它带有一个 Express 中间件，也可以单独使用.

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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