How To Pass Multipart Image File as parameter to a POST REST Service

Question

I have been trying to upload a multipart file in my Java Spring MVC Web Application using a POST REST service method. I have using the following REST service method to upload the file and this works fine when i choose the file using Postman REST service.

 @RequestMapping(value="/upload", method=RequestMethod.POST)
         public @ResponseBody String handleFileUpload( @RequestParam("file") MultipartFile file, ModelMap model)
         {
             //codes


            }

But when i tried to pass the multipart file as parameter to a POST REST service method in the controller. Its not working fine. So how can i pass multipart file as a queryparam to a POST REST service method.

  In my controller class I have:



 @RequestMapping(value = "/upload-image", method = RequestMethod.POST)
 public String uploadProfileImage(@RequestParam("fileUpload") MultipartFile fileUpload, Model model, HttpServletRequest request, HttpServletResponse response)
 {
    // codes
 }

I have the following bean in my root-context.xml file

<bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">


    </bean>

Any help is appreciated.

Answer 1

It is easy and a little bit strange. Do use @PathVariable instead of @RequestParam . I faced with this situation couple month ago. I do not know why it so, but snippet below works in my project.

    @ResponseBody
    @RequestMapping(method = RequestMethod.POST, value = "/upload-image", consumes = MULTIPART_FORM_DATA_VALUE, produces = APPLICATION_JSON_VALUE)
    public String uploadProfileImage(@PathVariable("fileUpload") MultipartFile file) {
        // ...
    }

Look at JerseyRestClientMultipartUpload.java to get example how to send MultiPart using Jersey .

final MultiPart multiPart = new FormDataMultiPart()
                .field("description", "Picture of Jabba the Hutt", MediaType.TEXT_PLAIN_TYPE)
                .field("characterProfile", jsonToSend, MediaType.APPLICATION_JSON_TYPE)
                .field("filename", fileToUpload.getName(), MediaType.TEXT_PLAIN_TYPE)
                .bodyPart(fileDataBodyPart);
multiPart.setMediaType(MediaType.MULTIPART_FORM_DATA_TYPE);

// POST request final
final WebResource resource = client.resource(API_URI)
ClientResponse response = resource.type("multipart/form-data").post(ClientResponse.class, multiPart);