你如何强制Spring MVC4 REST webservices只接受json格式的参数？

Question

有没有办法强制Spring MVC4 REST Web服务接受某些格式的参数或请求？ 我希望我的webservice接受JSON参数，只需将参数附加到url端点即可。 我尝试了下面的例子，但你可以通过url传递一个参数，我希望他们以干净的json格式传递它我如何在春天这样做。

 @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)