@RequestMapping(value = "/doRegister", method = RequestMethod.POST) 
public @ResponseBody User doRegister(@Valid User user, BindingResult result, Model model) { 
 if (result.hasErrors()) { 
 List<ObjectError> list = result.getAllErrors(); 
 for (ObjectError error : list) { 
  System.out.println(error.getDefaultMessage()); 
 } 
 return null; 
 } 
 System.out.println("注册.."); 
 return user; 
} 

public class ReturnType { 
 
 private int code; 
 private User data; 
 private String msg; 
 
 public ReturnType(int code, String msg, User data) { 
 this.code = code; 
 this.msg = msg; 
 this.data = data; 
 } 
 
 public int getCode() { 
 return code; 
 } 
 public void setCode(int code) { 
 this.code = code; 
 } 
 public User getData() { 
 return data; 
 } 
 public void setData(User data) { 
 this.data = data; 
 } 
 public String getMsg() { 
 return msg; 
 } 
 public void setMsg(String msg) { 
 this.msg = msg; 
 } 
 
} 

@RequestMapping(value = "/doRegister", method = RequestMethod.POST) 
public @ResponseBody ReturnType doRegister(@Valid User user, BindingResult result, Model model) throws Exception { 
 throw new Exception("new Exception"); 
} 

@ControllerAdvice 
public class ExceptionHandle { 
 
 /* 表明这个handler只处理什么类型的异常 
 * */ 
 @ExceptionHandler(value = Exception.class) 
 // 返回值为json或者其他对象 
 @ResponseBody 
 public ReturnType handle(Exception e) { 
 return new ReturnType(-1, e.getMessage(), null); 
 } 
}