浅谈JAVA在项目中如何自定义异常

@Data
public class R<T> implements Serializable {


    private static final long serialVersionUID = -8497670085742879369L;


    @ApiModelProperty(value = "返回码", example = "200")
    private Integer code=200;

    @ApiModelProperty(value = "返回消息", example = "")
    private String message="SUCCESS";

    @ApiModelProperty(value = "返回数据", example = "")
    private T data;

    private R() {
    }

    public R(T data) {
        this.data = data;
    }


    public R(Integer code,String message) {
        this.code=code;
        this.message = message;
    }



}

@Data
@AllArgsConstructor
@NoArgsConstructor
public class GuliException extends  RuntimeException{

    private Integer code;

    private String msg;
}

@ControllerAdvice
public class GlobalExceptionHandler {


    //指定出现什么异常执行这个方法
    @ExceptionHandler(GuliException.class)
    @ResponseBody  //返回数据
    public R error(GuliException e){
        e.printStackTrace();
        return new R(e.getCode(),e.getMsg());
    }
}

 @GetMapping("/testError")
    @ApiOperation(value = "测试异常处理")
    public R<UserVO> testError(@RequestParam("id") String id){
        UserVO userVO=new UserVO();
        SysUser byId = sysUserService.getById(id);
        BeanUtils.copyProperties(byId,userVO);

        return new R<>(userVO);
    }

@GetMapping("/testCheck")
    @ApiOperation(value = "测试返回值正常处理")
    public R<Boolean> testCheck(){
           try {
               int i=10/0;
           }catch (Exception e){
               e.printStackTrace();
               throw new GuliException(1001,"错误测试");
           }
        return  new R<>(true);
    }