CODEWITHSUNDEEP
javajsonspringhttpmultipartform-data
metamorphogenesis
metamorphogenesis

Reputation: 25

How to receive multipart request in Spring App

I've seen many sources and also few questions on SO but didn't find solution.

I want to send to my Spring app POST/PUT-requests that contain JSON-object Car and attached file.

For the moment I have a CarController which correctly works with JSON-objects

@PutMapping("/{id}/update")
public void updateCar(@PathVariable(value = "id") Long carId, @Validated @RequestBody Car car) throws ResourceNotFoundException {
    // I can work with received car
}

I also have a FileController which correctly works with file

@PostMapping("/upload")
public void uploadFiles(@RequestParam("file") MultipartFile file) throws IOException {
    // I can work with received file
}

But how should my method look like to be able to work with both car and file? This code doesn't provide me any of car or file.

@PutMapping("/{id}/update")
public void updateCar(@PathVariable(value = "id") Long carId, @Validated @RequestBody Car car, @RequestParam("file") MultipartFile file) throws ResourceNotFoundException, IOException {
    // can not work neither with car nor with file
}

Separate controllers work well during test from Postman. But when I try third code I got these results: enter image description here

enter image description here

Upvotes: 1

Views: 1753

Answers (3)

adlmez
adlmez

Reputation: 52

There is nothing wrong with your code and it could work as it is.

You could eventually improve its readability by using @RequestPart instead of @RequestParam and @RequestBody when it's a multipart request.

You can find more details about multipart requests in this article https://www.baeldung.com/sprint-boot-multipart-requests

Most importantly, to make it work/ or to test in the correct way:

When using postman for multipart requests, you have to define the content type of each RequestPart.

It's a hidden column in the form-data screen, that you can show as follows: enter image description here

Check the box "Content-Type" and the new column will appear: enter image description here

And finally, define the content type of each part.

Upvotes: 2

xerx593
xerx593

Reputation: 13261

Yes, I agree with Vladimir; multipart/form-data, @RequestParts instead of body & param:

@PutMapping(value = "/{id}/update", consumes = {MediaType.MULTIPART_FORM_DATA_VALUE})
public void updateCar(@PathVariable(value = "id") Long carId,
        @RequestPart("car") Car car, 
        @RequestPart("file") MultipartFile file) {
   ...

Then in Postman:

Postman Screenshot

  • use Body>form-data
  • when issues:
    • display Content-Type column.
    • set Content-Type per part.

Upvotes: 2

Vladimir Shadrin
Vladimir Shadrin

Reputation: 376

You can use consumes = { MediaType.MULTIPART_FORM_DATA_VALUE } field of @RequestMapping annotation and @RequestPart annotation for method parameters:

ResponseEntity<> foo(@RequestPart ParType value, @RequestPart MultipartFile anotherChoice) {
...

Upvotes: 3

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