How can i upload multi file.

In my case , i want to upload multi file ,but i get exception java.lang.IllegalStateException: Method has too many Body parameters,my code like that

@FeignClient(configuration = MultipartFormDataConfig.class)
public class Demo{
	@PostMapping(
		path = "/upload",
		consumes = org.springframework.http.MediaType.MULTIPART_FORM_DATA_VALUE
	)
	Response uploadFile(
		@RequestPart MultipartFile file1,
		@RequestPart MultipartFile file2
	);
}

[xxlabaza]

Так, на сколько я вижу вы тут сами уже во всём разобрались…

[rojekabc]

Ok. I see, that this issue is closed, but I’ll describe here a little workaround. I hope this will help someone. I resolve this in the issue, when I’s trying to send something like this via feign client:

void upload(
   @RequestPart(name="main") MultipartFile mainFile,
   @RequestPart(name="attachments") MultipartFile[] attachments);

In case of two request parts, when tries create feign client instance Method has too many Body parameters occurs. If I change them to RequestParam, than I get nothing (null).

So I do this in such way, that I create two interface API. The first version, with two RequestPart, is used on side of Controller implementation - in such way it recognizes correctly incoming parts and puts as argues. The second version, used to create feign client, looks like this

void upload(@RequestPart MultipartFile[] documents);

I’m using this with feign client configuration

    @Configuration
    class MultipartSupportConfig {

        @Bean
        public Encoder feignFormEncoder(ObjectFactory<HttpMessageConverters> messageConverters) {
            return new SpringFormEncoder(new SpringEncoder(messageConverters));
        }
    }

and with fix from PR: https://github.com/OpenFeign/feign-form/pull/97 - it’s needed, if for one field name (here attachments) we’d like send more than one multipart-file.

Then, if we’d like to use upload via feign client, we should call upload and create named multiparts. In this example example:

MultipartFile[] documents = new MultipartFile[3];
documents[0] = new MockMultipartFile("main", "sample-file.bin", MediaType.APPLICATION_OCTET_STREAM_VALUE, "MAIN-FILE-CONTENT".getBytes());
documents[1] = new MockMultipartFile("attachments", "attach-1.bin", MediaType.APPLICATION_OCTET_STREAM_VALUE, "ONE-CONTENT".getBytes());
documents[2] = new MockMultipartFile("attachments", "attach-2.bin", MediaType.APPLICATION_OCTET_STREAM_VALUE, "TWO-CONTENT".getBytes());
FeignClientInstance.upload(documents);

In this way multi part files names are used as field names. This will be recognized by controller and assigned to dedicated argues.