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 
  * 类描述： 业务异常父类
  * 创建人：GMM 
  * date 2019/3/11
  */ 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");         } }