make mvc controller return text instead of json - json

Question

I am trying to make method Spring MVC method in controller to return text instead of json.
My current method looks like this
#RequestMapping(value = "/upload", method = RequestMethod.POST, produces = "text/html")
public ModelAndView uploadFile(#RequestParam("file") MultipartFile file) {
LOGGER.debug("Attempt to upload file with template.");
try {
String fileContent = FileProcessUtils.processFileUploading(file);
return createSuccessResponse(fileContent);
} catch (UtilityException e) {
LOGGER.error("Failed to process file.", e.getWrappedException());
return createResponse(INTERNAL_ERROR_CODE, e.getMessage());
}
}
But the response header content-type: application/json.
I was trying to pass HttpServletResponse to controller and set content type but it still continued to return json.
What's the problem?

Answer 1

What's FileProcessUtils? Google doesn't bring up anything. Is it a class created by you or your organization? It would appear that the method is returning a response with a content-type of application/json. What were you expecting it to return and why? You would have to somehow parse the json to extract the data necessary for constructing a ModelAndView or find another method that returns what you want.
But without more information on FileProcessUtils, it isn't possible to provide more of an answer.

Answer 2

You can either do this:
#RequestMapping(value = "/foo", method = RequestMethod.GET)
public ResponseEntity foo() throws Exception {
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.TEXT_HTML);
return ResponseEntity.ok().headers(headers).body("response");
}
or do this:
#RequestMapping(value = "/foo", method = RequestMethod.GET, produces = MediaType.TEXT_HTML_VALUE)
Both works fine.