Attempting to test rest service with multipart file - spring

Question

I am attempting to test a rest service I created. The service is a post.
I wanted to create a file to pass the parameters(including a multi-part file).
From there I am trying to call the service at this point.
Pretty sure the service that doesn't work. But when I call rest Service. I have a simple form that just passes in a couple values including the jpg.
Here is the code.
HttpMessageConverter bufferedIamageHttpMessageConverter = new ByteArrayHttpMessageConverter();
restTemplate.postForObject("http://localhost:8080/sendScreeenAsPostCard", uploadItem.getFileData(), String.class));
My method signature is:
ResultStatus sendScreenAsPostcard( #RequestParam MultipartFile image, #RequestParamString userId)
That is the error I am getting.
Could not write request: no suitable HttpMessageConverter found for request type [org.springframework.web.multipart.commons.CommonsMultipartFile]

Answer 1

You need to simulate a file upload, which requires a particular content type header, body parameters, etc. Something like this should do the trick:
// Fill out the "form"...
MultiValueMap<String, Object> parameters = new LinkedMultiValueMap<String, Object>();
parameters.add("file", new FileSystemResource("file.jpg")); // load file into parameter
parameters.add("blah", blah); // some other form field
// Set the headers...
HttpHeaders headers = new HttpHeaders();
headers.set("Content-Type", "multipart/form-data"); // we are sending a form
headers.set("Accept", "text/plain"); // looks like you want a string back
// Fire!
String result = restTemplate.exchange(
"http://localhost:8080/sendScreeenAsPostCard",
HttpMethod.POST,
new HttpEntity<MultiValueMap<String, Object>>(parameters, headers),
String.class
).getBody();