Spring MVC 3->验证

我做到了在此示例中显示的内容：http : //blog.springsource.com/2010/01/25/ajax-
simplifications-in-spring-3-0/

@RequestMapping(method=RequestMethod.POST)public @ResponseBody Map<String, ? extends Object> create(@RequestBody Account account, HttpServletResponse response) {    Set<ConstraintViolation<Account>> failures = validator.validate(account);    if (!failures.isEmpty()) {        response.setStatus(HttpServletResponse.SC_BAD_REQUEST);        return validationMessages(failures);    } else {        accounts.put(account.assignId(), account);        return Collections.singletonMap("id", account.getId());    }}