spring統一異常處理

Spring提供了同意的異常處理註解，用戶只需要在錯誤的時候提示信息即可

1. 實現方式：
   
   • 在類上添加@ControllerAdvice註解
   • 在方法上添加@ExceptionHandler註解

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1. 例如：

   1. 自定義一個異常  AbstractApolloHttpException
   public class AbstractApolloHttpException extends RuntimeException{
     private static final long serialVersionUID = -1713129594004951820L;
   
    public AbstractApolloHttpException(String msg){
      super(msg);
    }
   
    public AbstractApolloHttpException(String msg, Exception e){
      super(msg,e);
    }
   }
   
   
   
   2. 自定義同意異常的處理類 GlobalDefaultExceptionHandler
   @ControllerAdvice
   public class GlobalDefaultExceptionHandler {
       //處理自定義Exception
    @ExceptionHandler({AbstractApolloHttpException.class})
    public ResponseEntity<Map<String, Object>> badRequest(HttpServletRequest request, AbstractApolloHttpException ex) {
      return handleError(request, ex.getHttpStatus(), ex);
    }
   private ResponseEntity<Map<String, Object>> handleError(HttpServletRequest request,
                                                         HttpStatus status, Throwable ex) {
   return handleError(request, status, ex, ERROR);
   }
   }