项目中一定会用到自定义异常

@Datapublic 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

@ControllerAdvicepublic 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;@Getterpublic 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
      eClass;    private HttpStatus httpStatus;    private ResultCode resultCode;    ExceptionEnum(Class
      eClass, HttpStatus httpStatus, ResultCode resultCode) {        this.eClass = eClass;        this.httpStatus = httpStatus;        this.resultCode = resultCode;    }    public Class
      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
      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 {}