使用Axios访问作为FormData发送的数据 [英] Accessing data sent as FormData using Axios

问题描述

我有一个用VueJS编写的应用程序，我将用户上传的文件发送到后端.为此，我使用Axios，并将文件作为FormData发送.问题是当我在后端时，我不知道如何访问FormData中的字段.

I have an application written in VueJS where I send a file, that the user uploads, to the backend. To do this I'm using Axios and I'm sending the file as a FormData. The problem is that I don't know how to access the fields in FormData when I'm in the backend.

我已经使用axios发送了一个文件，如下所示:

I've sent a file using axios like this:

onUpload(): void {
    if(this.fileChosen){
      const fd = new FormData();
      fd.append('file', this.selectedFile, this.selectedFile.name);
      axios.post('http://localhost:8080/routes', fd, {
        onUploadProgress: uploadEvent => {
          console.log('Upload Progress' + Math.round(uploadEvent.loaded / uploadEvent.total) * 100 + " %");
        }
      })
      .then(
        res => {
          console.log(res);
        });
    } else {
      this.fileMsg = "You haven't chosen a file";
    }
  }
}

然后在我的后端中，我要访问我发送的该文件:

Then in my backend I want to access this file that I sent:

app.post('/routes', function(req, res){
    res.set("Access-Control-Allow-Origin", "*");
    // Here I want to access my file! But how?
});

推荐答案

我在使用 axios 上传文件时遇到问题，因此可以使用模块 superagent ( https://github.com/visionmedia/superagent )，该文件支持使用formData上传文件.然后，在后端，您需要使用 multer ( https://github.com /expressjs/multer )，以获取文件.

I had problems with using axios for file uploading so you can use the module superagent (https://github.com/visionmedia/superagent) that supports file uploading with formData. Then, in the backend, you need to use multer (https://github.com/expressjs/multer), to get the file.

在前端文件中

//Method to do the request
superagent
.post(/register")
.attach("avatar", uploadedImage)

uploadedImage具有您在VueJS组件中获得的图像内容

uploadedImage has the image content that you get in the VueJS component

在后端文件中

var multer = require('multer')
var upload = multer({ dest: 'uploads/' })
import fs from 'fs-extra'

router.post('/register', upload.single('avatar'), (req, res, next) => {
    return fs.readFile(req.file.path)
            .then(content => {
                // The content of the file
            })
}

使用此代码，每次您将文件内容上载到formdata中的文件/register时，图像将存储在后端的/uploads文件夹中.请注意，图像密钥的前端和后端必须相同，在这种情况下为头像.

With this code, everytime you upload a file to /register with the file content in the formdata, your image will be stored in /uploads folder on your backend. Please note that the image key must be the same in the frontend and backend, in this case, avatar.

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