REST Service that can consume both JSON and Multipart Form

Question

I need to create a method in Spring MVC that can handle both JSON and Multipart Form requests.

This is my method's signature:

@RequestMapping(value = { "/upload_image" }, method = RequestMethod.POST)
public @ResponseBody void uploadImage(final ImageDTO image) 

ImageDTO class looks as following:

public class ImageDTO {
  private String imageUrl;
  private Long imageId;
  private MultipartFile image;

  public String getImageUrl() {
    return imageUrl;
  }

  public void setImageUrl(final String url) {
    this.imageUrl = url;
  }

  public Long getImageId() {
    return imageId;
  }

  public void setImageId(final Long imageId) {
    this.imageId = imageId;
  }

  public MultipartFile getImage() {
    return image;
  }

  public void setImage(MultipartFile image) {
    this.image = image;
  }
}

So the scenario is that I need to support two scenarios: 1. Image up load from form, where the Content-Type is multipart-form (all DTO members are not null) 2. Image upload using JSON, using ONLY the imageUrl. In this case, the request body looks like this:

{
    "imageId":"1236",
    "imageUrl":"http://some.image.url",
    "image":null
}

The current implementation handles the multipart request well, but when sending the JSON, the ImageDTO object contains NULLs in all its members.

Is is it possible to make the same method handle both content types?

Thank you.

Answer 1

To receive JSON you need to mark ImageDTO argument with @RequestBody

@RequestMapping(value = { "/upload_image" }, method = RequestMethod.POST)
public @ResponseBody void uploadImage(final @RequestBody ImageDTO image)