Making a MultiPart Put request via Spring Rest to call a API with formData (Replace Apache MultipartEntityBuilder with REST)

CeePlusPlus :

I have a PUT API to call to send my data that expects a Multipart Request. (Swagger has the API listed as Paramter Type formData; Data Type file).

I have this code working fine via Apache's Http Library, but to match the rest of the program I would like to use Spring Rest Template to make the same call.

//Via Apache:
Uri uri = "http://putmyresults.com";
ResultObject results = buildResultObject(myData);
MultipartEntityBuilder meb = MultipartEntityBuilder.create();
meb.addBinaryBody("file", results.convertToBytes(), ContentType.create("application/octet-stream"),"MyResultFile");
HttpEntity entity = meb.build();
put.setEntity(entity);

put.setHeader(new BasicHeader("Authorization","myToken"));
put.setHeader("Accept","application/json,application,octet-stream");
getMyCloseableHttpClient().execute(put);
//process response codes...



//Sample working REST for GET request:
Uri uri = "http://getmyresults.com/section5/resultId?sectionId=foo";
RestTemplate rest = new RestTemplate;

org.springframework.http.HttpEntity header = new HttpHeaders();
header.set("Authorization","myToken");
header.setContentType(MediaType.APPLICATION_JSON);
header.setAccept(Arrays.asList(MediaType.APPLICATION_JSON,MediaType.APPLICATION_OCTET_STREAM));

HttpEntity<String> entity = new HttpEntity("parameters", headers);
rest.exchange(uri, HttpMethod.GET, entity, Resource.class);
//process response...

But I can't seem to make the PUT request via REST. This is what I have so far:

Uri uri = "http://putmyresults.com";
MultiValueMap<String,Object> map = new LinkedMultiValueMap<>();
ResultObject results = buildResultObject(myData);
byte[] bytes = results.convertToBytes();

HttpHeaders header = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
org.springframework.http.HttpEntity<byte[]> entity = new HttpEntity<>(bytes,headers);
map.add("MyResultFile",entity);

HttpHeaders tokenHeader = new HttpHeaders();
tokenHeader.set(new BasicHeader("Authorization","myToken"));
tokenHeader.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<String> tokenEntity = new HttpEntity("parameters", headers);
map.add("parameters",tokenEntity);

org.springframework.http.HttpEntity<<MultiValueMap<String,Object> requestMap = new org.springframework.http.HttpEntity<>(map);
new RestTemplate().exchange(uri,HttpMethod.PUT,requestMap,String.class);

Server Header:

@PutMapping(path = "/xyz")
public ResponseEntity putRequest{
    HttpServletRequest request,
    HttpServletResponse response,
    @PathVariable String id,
    @RequestParam("file") MultipartFile uploadedFile,
    @RequestParam String sample,
    @RequestParam String sample2 throws Exception  {
        uploadedFile.getBytes(); ...
    }
}

Thanks for your help.

CeePlusPlus :

With the help of @user2683814 and this article, this is what works for me:

import org.springframework.http.*; //Used with 5.1.9.RELEASE

Uri uri = "http://putmyresults.com";
byte[] bytes = MyObject.getMyBytes();

MultiValueMap<String,String> fileMap = new LinkedMultiValueMap<>();
ContentDisposition cd = ContentDisposition.builder("form-data").
name("file").filename("myFile").build();
filemap.add(HttpHeaders.CONTENT_DISPOSITION,cd.toString());

HttpEntity<byte[]> fileEntity = new HttpEntity<>(bytes,fileMap);
MultiValueMap<String,Object> body = new LinkedMultiValueMap<>();
body.add("file",fileEntity);


HttpHeaders tokenHeader = new HttpHeaders();
tokenHeader.set("Authorization","myToken");
tokenHeader.setContentType(MediaType.MULITPART_FORM_DATA);

HttpEntity<MultiValueMap<String,Object>> requestMap = new HttpEntity<>(body,securedTokenHeaders);


new RestTemplate().exchange(uri,HttpMethod.PUT,requestMap,String.class)