抛出自定义异常

1.自定义异常

@Getter
public class ServiceImplException extends RuntimeException {private ResultCode resultCode;public ServiceImplException(ResultCode resultCode) {this.resultCode = resultCode;}
}

 ResultCode是一个枚举类，用来枚举出现的状态码和异常信息。

@AllArgsConstructor
@Getter
public enum ResultCode {/** 定义状态码 *///操作成功SUCCESS                     (1000, "操作成功"),//服务器内部错误，友好提示ERROR                       (2000, "服务繁忙请稍后重试")
}

2.定义全局异常处理

实现代码：

@Slf4j
@RestControllerAdvice
public class GlobalExceptionHandler<T> {@ExceptionHandler(HttpRequestMethodNotSupportedException.class)public Result<?>handleHttpRequestMethodNotSupported(HttpRequestMethodNotSupportedException e,HttpServletRequest request){String requestURI = request.getRequestURI();log.error("请求地址'{}',不⽀持'{}'请求", requestURI, e.getMethod());return Result.failed(ResultCode.FAILED_USER_NOT_EXISTS);}/*** 拦截运⾏时异常*/@ExceptionHandler(RuntimeException.class)public Result<?> handleRuntimeException(RuntimeException e, HttpServletRequestrequest) {String requestURI = request.getRequestURI();log.error("请求地址'{}',发⽣异常.", requestURI, e);return Result.failed(ResultCode.ERROR);}/*** 捕获service层的异常* @param e* @param request* @return*/@ExceptionHandler(ServiceImplException.class)public Result<?> ServiceImplException(ServiceImplException e, HttpServletRequest request) {String requestURI = request.getRequestURI();ResultCode resultCode = e.getResultCode();log.error("请求地址'{}',发生业务异常.", requestURI, resultCode.getMsg(),e);return Result.failed(resultCode);}/*** 系统异常*/@ExceptionHandler(Exception.class)public Result<?> handleException(Exception e, HttpServletRequest request) {String requestURI = request.getRequestURI();log.error("请求地址'{}',发⽣异常.", requestURI, e);return Result.failed (ResultCode. ERROR );}@ExceptionHandler(MethodArgumentNotValidException.class)public Result<?> handleBindException(Exception e, HttpServletRequest request) {String requestURI = request.getRequestURI();log.error("请求地址'{}',发⽣异常.", requestURI, e);return Result.failed (ResultCode.ERROR_FORMAT );}
}

注意两点：

一是需要在类上@RestControllerAdvice加上注解。

二是需要在相应的方法上加上@ExceptionHandler注解，后面跟上处理相应的异常。

最终达到的效果就是我们在服务层抛出相应的异常之后，这里会自动捕捉抛出的异常，但是抛出的异常必须是这里实现相应的逻辑的异常。