@ControllerAdvice + @ExceptionHandler 全局处理 Controller 层异常

1.自定义异常处理类

**
 * 自定义异常处理类
 * 针对不同的异常自定义不同的方法
 * 环绕通知
 * 切面:针对所有的controller中抛出的异常
 * 若使用@ControllerAdvice,则不会自动转换为JSON格式
 */
@RestControllerAdvice
public class RestExceptionHandler {

/**
 * 业务异常处理
 * @param e
 * @return ErrorInfo
 */
@ExceptionHandler({BaseBusinessException.class})
public ErrorInfo BusinessExceptionHandler(BaseBusinessException e) {
    return new ResponseResultUtil().error(e.getCode(), e.getMessage());
}

}

2.定义一个用于返回页面结果信息的VO对象类：ErrorInfo

public class ErrorInfo {
   private Integer code;
   private String message;

   public ErrorInfo(){};

   public ErrorInfo(Integer code, String message) {
      super();
      this.code = code;
      this.message = message;

   }
   public Integer getCode() {
      return code;
   }
   public void setCode(Integer code) {
      this.code = code;
   }
   public String getMessage() {
      return message;
   }
   public void setMessage(String message) {
      this.message = message;
   }
}

3.封装一个基础业务异常类（让所有自定义业务异常类 继承此 基础类）：BaseBusinessException

/**
 * 类名称： BaseBusinessException <br>
 * 类描述： 业务异常父类<br>
 * 创建人：GMM <br>
 * date 2019/3/11<br>
 */
public class BaseBusinessException extends RuntimeException {

    private Integer code;

    // 给子类用的方法
    public BaseBusinessException(HttpStatus httpStatus) {
        this(httpStatus.value(),httpStatus.getReasonPhrase());
    }

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

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }
}
4.service 层抛出

@Service
public class UserLoginServiceImpl implements UserLoginService {

    @Autowired
    private UserLoginRepsitory userLoginRepsitory;

    @Transactional
    @Override
    public boolean login(String userCode, String password) {
        Employee employee=userLoginRepsitory.getEmployeeByCode(userCode);
        if(StringUtils.isBlank(userCode)){
            throw new BaseBusinessException(101,"用户名不能为空");
        }
}