node.js - 使用 NodeJS 进行多部分文件上传

Question

我在上传文件以使用 NodeJS 时遇到问题。我正在使用 Dropzone.JS 创建一个向/file-upload 发送 POST 请求的表单:

<form action="/file-upload" class="dropzone dragndrop" id="my-awesome-dropzone"></form> 

然后我在 app.js 中有一个路由:

app.post('/file-upload', routes.upload);

然后是我的处理程序:

exports.upload = function(req, res){
     console.log(req.files);
     res.send("OK");
}

但是，这里的上传函数永远不会被调用。服务器首先因此错误而崩溃:

events.js:69
        throw arguments[1]; // Unhandled 'error' event
                       ^
Error: Invalid data
    at WriteStream._write (fs.js:1616:31)
    at onwrite (_stream_writable.js:265:14)
    at WritableState.onwrite (_stream_writable.js:94:5)
    at fs.js:1628:5
    at Object.wrapper [as oncomplete] (fs.js:475:5)
    at process._makeCallback (node.js:321:24)

所以我不确定我应该做什么，因为这似乎不是我的错。我遵循了其他教程，并没有发现任何问题。此外，当我在 chrome 开发工具下检查我的网络时，它显示:

Request URL:http://localhost:3000/file-upload
**Request Headers**
Accept:application/json
Cache-Control:no-cache
Content-Type:multipart/form-data; boundary=----WebKitFormBoundaryMmLSkbfQskfIcjfE
Origin:http://localhost:3000
Pragma:no-cache
Referer:http://localhost:3000/
User-Agent:Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.52 Safari/537.17
X-File-Name:Screenshot from 2013-03-20 12:23:42.png
X-Requested-With:XMLHttpRequest
**Request Payload**
------WebKitFormBoundaryMmLSkbfQskfIcjfE
Content-Disposition: form-data; name="file"; filename="Screenshot from 2013-03-20 12:23:42.png"
Content-Type: image/png


------WebKitFormBoundaryMmLSkbfQskfIcjfE--

Answer 1

@user568109 和@nick-fishman 是正确的；您应该为此使用 bodyParser 中间件。

请参阅下面的基本文件上传表单的示例代码。 (注意:您需要创建一个“上传”目录来存储文件。)

文件上传.js:

var express = require("express"),                                                                
    app = express();                                                                             

// tell express to use the bodyParser middleware                                                 
// and set upload directory                                                                      
app.use(express.bodyParser({ keepExtensions: true, uploadDir: "uploads" }));                     
app.engine('jade', require('jade').__express);                                                   

app.post("/upload", function (request, response) {                                               
    // request.files will contain the uploaded file(s),                                          
    // keyed by the input name (in this case, "file")                                            

    // show the uploaded file name                                                               
    console.log("file name", request.files.file.name);                                           
    console.log("file path", request.files.file.path);                                           

    response.end("upload complete");                                                             
});                                                                                              

// render file upload form                                                                       
app.get("/", function (request, response) {                                                      
    response.render("upload_form.jade");                                                         
});                                                                                              

app.listen(3000);

views/upload_form.jade:

doctype 5
html
    head
        title Upload Form
    body
        h1 Upload File
        form(method="POST", action="/upload", enctype="multipart/form-data")
            input(type="file", name="file")
            input(type="submit")