使用注解实现异常错误

@ControllerAdvice   处理整个web controller的异常

@Slf4j
@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler({ArithmeticException.class,NullPointerException.class})  //处理异常 数组可以包含多个
    public String handleArithException(Exception e){

        log.error("异常是：{}",e);
        return "login"; //视图地址
    }
}

 

@ResponseStatus  

@ResponseStatus(value= HttpStatus.FORBIDDEN,reason = "用户数量太多")  定义状态信息    这个就是一个403的错误

@ResponseStatus(value= HttpStatus.FORBIDDEN,reason = "用户数量太多")
public class UserTooManyException extends RuntimeException {

    public  UserTooManyException(){

    }
    public  UserTooManyException(String message){
        super(message);
    }
}