自定义异常和异常处理

项目中一定会用到自定义异常

@Data
public class BusinessException extends RuntimeException {

    private static final long serialVersionUID = 194906846739586856L;

    protected String code;

    protected String message;

    protected ResultCode resultCode;

    protected Object data;

    public BusinessException() {
        ExceptionEnum exceptionEnum = ExceptionEnum.getByEClass(this.getClass());
        if (exceptionEnum != null) {
            resultCode = exceptionEnum.getResultCode();
            code = exceptionEnum.getResultCode().getCode().toString();
            message = exceptionEnum.getResultCode().getMessage();
        }

    }

    public BusinessException(String message) {
        this();
        this.message = message;
    }

    public BusinessException(String format, Object... objects) {
        this();
        format = StringUtils.replace(format, "{}", "%s");
        this.message = String.format(format, objects);
    }

    public BusinessException(String msg, Throwable cause, Object... objects) {
        this();
        String format = StringUtils.replace(msg, "{}", "%s");
        this.message= String.format(format, objects);
    }

    public BusinessException(ResultCode resultCode, Object data) {
        this(resultCode);
        this.data = data;
    }

    public BusinessException(ResultCode resultCode) {
        this.resultCode = resultCode;
        this.code = resultCode.getCode().toString();
        this.message = resultCode.getMessage();

    }


}

异常处理

@ControllerAdvice
public class ExceptionHandler {
    @ExceptionHandler(value = Exception.class)
    @ResponseBody
    public Result error(Exception e){
        e.printStackTrace();
        return new Result(false, StatusCode.ERROR, "执行出错");
    }

    @ExceptionHandler(value = BusinessException.class)
    public Result errorHandle(BusinessException e){
        return new Result(false, StatusCode.ERROR, e.message);
    }
}

枚举 ResultCode 

import lombok.Getter;

@Getter
public enum ResultCode {

    PARAM_IS_INVALID(1, "参数错误"),
    RESULE_DATA_NONE(2, "结果为空"),
    DATA_ALREADY_EXISTED(3, "记录已存在"),
    USER_NOT_LOGGED_IN(4, "用户未登录"),
    PERMISSION_NO_ACCESS(5, "没有访问权限"),
    INTERFACE_OUTTER_INVOKE_ERROR(6, "接口错误"),
    SYSTEM_INNER_ERROR(7, "系统内部错误");
    private Integer code;
    private String message;

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

}

枚举异常

public enum ExceptionEnum {

    /**
     * 无效参数
     */
    PARAMETER_INVALID(ParameterInvalidException.class, HttpStatus.BAD_REQUEST, ResultCode.PARAM_IS_INVALID),

    /**
     * 数据未找到
     */
    NOT_FOUND(DataNotFoundException.class, HttpStatus.NOT_FOUND, ResultCode.RESULE_DATA_NONE),

    /**
     * 数据已存在
     */
    CONFLICT(DataConflictException.class, HttpStatus.CONFLICT, ResultCode.DATA_ALREADY_EXISTED),

    /**
     * 用户未登录
     */
    UNAUTHORIZED(UserNotLoginException.class, HttpStatus.UNAUTHORIZED, ResultCode.USER_NOT_LOGGED_IN),

    /**
     * 无访问权限
     */
    FORBIDDEN(PermissionForbiddenException.class, HttpStatus.FORBIDDEN, ResultCode.PERMISSION_NO_ACCESS),

    /**
     * 远程访问时错误
     */
    REMOTE_ACCESS_ERROR(RemoteAccessException.class, HttpStatus.INTERNAL_SERVER_ERROR, ResultCode.INTERFACE_OUTTER_INVOKE_ERROR),

    /**
     * 系统内部错误
     */
    INTERNAL_SERVER_ERROR(InternalServerException.class, HttpStatus.INTERNAL_SERVER_ERROR, ResultCode.SYSTEM_INNER_ERROR);

    private Class<? extends BusinessException> eClass;

    private HttpStatus httpStatus;

    private ResultCode resultCode;

    ExceptionEnum(Class<? extends BusinessException> eClass, HttpStatus httpStatus, ResultCode resultCode) {
        this.eClass = eClass;
        this.httpStatus = httpStatus;
        this.resultCode = resultCode;
    }

    public Class<? extends BusinessException> getEClass() {
        return eClass;
    }

    public HttpStatus getHttpStatus() {
        return httpStatus;
    }

    public ResultCode getResultCode() {
        return resultCode;
    }

    public static boolean isSupportHttpStatus(int httpStatus) {
        for (ExceptionEnum exceptionEnum : ExceptionEnum.values()) {
            if (exceptionEnum.httpStatus.value() == httpStatus) {
                return true;
            }
        }

        return false;
    }

    public static boolean isSupportException(Class<?> z) {
        for (ExceptionEnum exceptionEnum : ExceptionEnum.values()) {
            if (exceptionEnum.eClass.equals(z)) {
                return true;
            }
        }

        return false;
    }

    public static ExceptionEnum getByHttpStatus(HttpStatus httpStatus) {
        if (httpStatus == null) {
            return null;
        }

        for (ExceptionEnum exceptionEnum : ExceptionEnum.values()) {
            if (httpStatus.equals(exceptionEnum.httpStatus)) {
                return exceptionEnum;
            }
        }

        return null;
    }

    public static ExceptionEnum getByEClass(Class<? extends BusinessException> eClass) {
        if (eClass == null) {
            return null;
        }

        for (ExceptionEnum exceptionEnum : ExceptionEnum.values()) {
            if (eClass.equals(exceptionEnum.eClass)) {
                return exceptionEnum;
            }
        }

        return null;
    }
}

用户未登录Exception异常

public class UserNotLoginException extends BusinessException {
}