How to do file upload with Spring REST API and Test it with RestTemplate - spring

Question

I want to,
1) Implement some REST service method with Spring Rest API for upload some files from my remote web client.
2) Test that with my RestTemplate based remote web client.
If any one has some idea please help me. Thanks.
Some of my Spring REST API base methods are as below,
#RequestMapping(value="user/create/{userRoleName}", method=RequestMethod.POST)
public #ResponseBody User create(#RequestBody User user, #PathVariable String userRoleName, HttpServletResponse response) { }
Some of my remote client's Spring RestTemplate base codes are as below,
Map<String, String> vars = new HashMap<String, String>();
vars.put("userRoleName", userRoleName);
ResponseEntity<User> REcreateUser = restTemplate.postForEntity(IMC_LAB_SKELETON_URL + "/user/create/{userRoleName}", newUser, User.class, vars);
User createUser = REcreateUser.getBody();

Answer 1

Try this:
public class FileUploadService {
#POST
#Path("/file")
#Consumes(MediaType.MULTIPART_FORM_DATA)
public Response upload(Attachment attachment,#Context HttpServletRequest request) {
DataHandler handler = attachment.getDataHandler();
try {
InputStream stream = handler.getInputStream();
MultivaluedMap map = attachment.getHeaders();
OutputStream out = new FileOutputStream(new File(getFileName(map)));
int read = 0;
byte[] bytes = new byte[1024];
while ((read = stream.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
stream.close();
out.flush();
out.close();
} catch(Exception e) {
e.printStackTrace();
}
}
return Response.ok("file uploaded").build();
}
This can easily be tested with RestTemplate.
Imports:
MediaType
Attachment
MultivaluedMap

Answer 2

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.MULTIPART_FORM_DATA);
MultiValueMap<String, Object> bodyMap = new LinkedMultiValueMap<>();
//Json Payload as String
bodyMap.add("payload", payload);
for (File file : fileArray) {
bodyMap.add("file", new FileSystemResource(file));
}
HttpEntity<MultiValueMap<String, ?>> entity = new
HttpEntity<MultiValueMap<String, ?>>(bodyMap, headers);