1、异常捕获处理器

  • @ControllerAdvice+@ExceptionHandler ```java @Slf4j @ControllerAdvice public class GlobalExceptionHandler {
  1. @ExceptionHandler(value = {ArithmeticException.class,NullPointerException.class})
  2. public String handleArithException(Exception e){
  3.     log.error("异常是:{}",e.toString());
  4.     return "login";
  5. }

}

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### 2、自定义异常 

- @ResponseStatus自定义错误
```java
@ResponseStatus(value = HttpStatus.FORBIDDEN,reason = "用户太多了")
public class UserTooManyException extends RuntimeException {
}

  • 使用错误

    @GetMapping(value = {"/login","/"})
  public String loginPage(HttpServletRequest request){
      if (request != null){
          throw new UserTooManyException();
      }
      return "login";
  }

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    3、自定义异常处理器

  • @Component+实现接口HandlerExceptionResolver+设置优先级为最高@Order(value = Ordered.HIGHEST_PRECEDENCE)

    @Order(value = Ordered.HIGHEST_PRECEDENCE) // 最高优先级
@Component
public class CustomExceptionResolver implements HandlerExceptionResolver {
  @Override
  public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
      try {
          response.sendError(533,"这tm是我自定义的异常解析器");
      } catch (IOException e) {
          e.printStackTrace();
      }
      return new ModelAndView();
  }
}

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