springboot全局异常处理学习

1. 枚举项目错误信息

   public enum CommonError {UNKOWN_ERROR("执行过程异常，请重试。"),PARAMS_ERROR("非法参数"),OBJECT_NULL("对象为空"),QUERY_NULL("查询结果为空"),REQUEST_NULL("请求参数为空");private String errMessage;public String getErrMessage() {return errMessage;}CommonError(String errMessage) {this.errMessage = errMessage;}}
   

2. 项目自定义业务异常

   /*** @version 1.0* @Author zhaozhixin* @Date 2023/4/16 23:12* @注释 本项目自定义异常类型*/
   public class EducationOnlineException extends RuntimeException{public EducationOnlineException() {}private String message;public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}public EducationOnlineException(String message) {super(message);this.message = message;}public static  void cast(CommonError commonError){throw new EducationOnlineException(commonError.getErrMessage());}public static  void cast(String message){throw new EducationOnlineException(message);}
   }
   

3. 报错响应参数包装

   /*** @version 1.0* @Author zhaozhixin* @Date 2023/4/16 23:09* @注释 报错响应参数包装*/
   public class RestErrorResponse implements Serializable {private String errMessage;public RestErrorResponse(String errMessage) {this.errMessage = errMessage;}public String getErrMessage() {return errMessage;}public void setErrMessage(String errMessage) {this.errMessage = errMessage;}
   }
   

4. 全局异常处理类

   /*** @version 1.0* @Author zhaozhixin* @Date 2023/4/16 23:26* @注释 全局异常处理类*/@Slf4j
   //@ControllerAdvice
   @RestControllerAdvice //相当于@ControllerAdvice + @ResponseBody
   public class GlobalExceptionHandler {//对项目的自定义异常类型进行处理(业务异常)@ExceptionHandler(EducationOnlineException.class)@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)public RestErrorResponse  customException(EducationOnlineException onlineException){//记录异常日志log.error("业务异常{}",onlineException.getMessage(),onlineException);//解析出异常信息String message = onlineException.getMessage();RestErrorResponse restErrorResponse = new RestErrorResponse(message);return restErrorResponse;}//框架抛出的异常(系统异常)@ExceptionHandler(Exception.class)@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)public RestErrorResponse  exception(Exception exception){//记录异常日志log.error("系统异常{}",exception.getMessage(),exception);//解析出异常信息RestErrorResponse restErrorResponse = new RestErrorResponse(CommonError.UNKOWN_ERROR.getErrMessage());return restErrorResponse;}
   }

5. 在业务代码中的实例

    //参数的合法性校验if (StringUtils.isBlank(dto.getName())) {EducationOnlineException.cast(CommonError.PARAMS_ERROR);}//插入数据库int insert = courseBaseMapper.insert(courseBaseNew);if (insert <=0 ){EducationOnlineException.cast("添加课程失败");}//如果课程收费，价格没有填写也需要抛出异常if (charge.equals("201001")){if (courseMarketNew.getPrice()==null || courseMarketNew.getPrice() <= 0){EducationOnlineException.cast("课程的价格不能为空并且必须大于0");}}