Spring Multipart File with @RequestBody

Question

I am trying to upload data from an app to a spring backend service. Things to upload are a DataModel containing data of the object to create and several images linked to the data. Therefore I am using this method signature:

@RequestMapping(method = RequestMethod.POST)
@ResponseBody
public Survey createSurvey(@RequestBody SurveyPostHelper helper, @RequestParam(value="file", required = true) MultipartFile[] images)

I tried to play with the annotations, but either I get a blank images array or my helper is empty. How would you solve this?

Thanks in advance.

could you provide a code which is used for uploading images? — pezetem, Feb 20 '17 at 21:31
I do this with Alamofire, but I solved it in the mean while. Thank you for your time — Yannick Wiesner, Feb 20 '17 at 23:44

score 13 · Accepted Answer · answered Feb 20 '17 at 23:43

13

I found out, that this method signature could do the job:

@ResponseBody
public Survey createSurvey(@RequestPart(required=true) SurveyPostHelper helper, @RequestPart(value="file", required = true) final MultipartFile[] images)

Important in my case was to set the MimeType in the client app. The files MimeType should be image/jpg and the SurveyPostHelpers to application/json to allow Spring to parse the json and bind it to my Object.

answered Feb 20 '17 at 23:43

Yannick Wiesner

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could you please show your client app? are you sending it with ajax? – kavain Feb 27 '18 at 15:31
I am sending from an iOS application with the Alamofire lib. It uses a multipart POST request to upload multipe images and a JSON object. This should be possible via AJAX, too. – Yannick Wiesner Feb 28 '18 at 14:32

score 3 · Answer 2 · answered Mar 08 '18 at 20:35

see an example of the client code working for me images is the list of files I want to save

var formData = new FormData();

for (var i = 0; i < images.length ; i++) {
  formData.append('images', images[i]);
}

formData.append('adData', new Blob([JSON.stringify(adData)], {
    type: "application/json"
}));

Spring Multipart File with @RequestBody

2 Answers2

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