Java Question
Spring cannot process “multipart/form-data” POST request (error 400 “Bad request”)
when I post request to this server code - everething works good:
@RequestMapping(method = RequestMethod.POST, consumes = { "application/json" })
public ResponseEntity<String> addQuestion(@RequestBody String dtoObject) { ... }
but if I change request to "multipart/form-data" - Spring returns error 400 "Bad request":
@RequestMapping(method = RequestMethod.POST, consumes = { "multipart/form-data" })
public ResponseEntity<String> addQuestion(@RequestBody String dtoObject) { ... }
Why?
May be I should create some extra bean?
PS: I need "multipart/form-data" for sending files together with json objects.
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Answer Source
I think you can't deserialize the file to that dtoObject within the request body. you will need to use @RequestPart to do that.
@RequestMapping(method = RequestMethod.POST, consumes = { "multipart/form-data" })
public ResponseEntity<String> addQuestion2(@RequestPart("question") QuestionPostDto dtoObject, @RequestPart("file") MultiPartFile file) { ... }
your request need to be formdata: with the file you want to upload and json format file question.json
here is my payload example from post man
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="file"; filename="QLbLFIR.gif"
Content-Type: image/gif
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="question"; filename="question.json"
Content-Type: application/json
------WebKitFormBoundary7MA4YWxkTrZu0gW--
or if you don't want to pass a json format file you can pass it with a normal string
@RequestMapping(method = RequestMethod.POST, consumes = { "multipart/form-data" })
public ResponseEntity<String> addQuestion2(String question, @RequestPart("file") MultiPartFile file) {
QuestionPostDto dtoObject = new ObjectMapper().readValue(request, QuestionPostDto.class);
// do sth
}
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="file"; filename="QLbLFIR.gif"
Content-Type: image/gif
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="request"
{
"key": "value"
}
------WebKitFormBoundary7MA4YWxkTrZu0gW--
see this thread for more detail: Spring MVC Multipart Request with JSON
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