你如何強制Spring MVC4 REST webservices只接受json格式的參數？

Question

有沒有辦法強制Spring MVC4 REST Web服務接受某些格式的參數或請求？ 我希望我的webservice接受JSON參數，只需將參數附加到url端點即可。 我嘗試了下面的例子，但你可以通過url傳遞一個參數，我希望他們以干凈的json格式傳遞它我如何在春天這樣做。

 @RequestMapping(value = "/user/{id}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<User> getUser(@PathVariable("id") long id) {
    System.out.println("Fetching User with id " + id);
    User user = userService.findById(id);
    if (user == null) {
        System.out.println("User with id " + id + " not found");
        return new ResponseEntity<User>(HttpStatus.NOT_FOUND);
    }
    return new ResponseEntity<User>(user, HttpStatus.OK);
}

Answer 1

 @RequestMapping(...,consumes= MediaType.APPLICATION_JSON_VALUE)

Answer 2

@RequestMapping(value = "/user/{id}", 
        method = RequestMethod.GET, 
        produces = MediaType.APPLICATION_JSON_VALUE, 
        consumes = MediaType.APPLICATION_JSON_VALUE)