Spring MVC控制器中的JSON参数

发布于02月11日

我有

@RequestMapping(method = RequestMethod.GET)
@ResponseBody
SessionInfo register(UserProfile profileJson){
  ...
}

我是这样通过的:

http://server/url?profileJson={"email": "mymail@gmail.com"}

but my profileJson object has all null fields. What should I do to make spring parse my json?

推荐答案

This could be done with a custom editor, that converts the JSON into a UserProfile object:

public class UserProfileEditor extends PropertyEditorSupport  {

    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        ObjectMapper mapper = new ObjectMapper();

        UserProfile value = null;

        try {
            value = new UserProfile();
            JsonNode root = mapper.readTree(text);
            value.setEmail(root.path("email").asText());
        } catch (IOException e) {
            // handle error
        }

        setValue(value);
    }
}

这用于在控制器类中注册编辑器:

@InitBinder
public void initBinder(WebDataBinder binder) {
    binder.registerCustomEditor(UserProfile.class, new UserProfileEditor());
}

下面是如何使用编辑器解组JSONP参数:

@RequestMapping(value = "/jsonp", method = RequestMethod.GET, produces = {MediaType.APPLICATION_JSON_VALUE})
@ResponseBody
SessionInfo register(@RequestParam("profileJson") UserProfile profileJson){
  ...
}