public abstract class Assert {
    public Assert() {
    }
    public static void notNull(@Nullable Object object, String message) {
        if (object == null) {
            throw new IllegalArgumentException(message);
        }
    }
}

public interface Assert {
    /**
     * 創(chuàng)建異常
     * @param args
     * @return
     */
    BaseException newException(Object... args);
    /**
     * 創(chuàng)建異常
     * @param t
     * @param args
     * @return
     */
    BaseException newException(Throwable t, Object... args);
    /**
     * <p>斷言對(duì)象<code>obj</code>非空。如果對(duì)象<code>obj</code>為空，則拋出異常
     *
     * @param obj 待判斷對(duì)象
     */
    default void assertNotNull(Object obj) {
        if (obj == null) {
            throw newException(obj);
        }
    }
    /**
     * <p>斷言對(duì)象<code>obj</code>非空。如果對(duì)象<code>obj</code>為空，則拋出異常
     * <p>異常信息<code>message</code>支持傳遞參數(shù)方式，避免在判斷之前進(jìn)行字符串拼接操作
     *
     * @param obj 待判斷對(duì)象
     * @param args message占位符對(duì)應(yīng)的參數(shù)列表
     */
    default void assertNotNull(Object obj, Object... args) {
        if (obj == null) {
            throw newException(args);
        }
    }
}

public interface IResponseEnum {
    int getCode();
    String getMessage();
}
/**
 * <p>業(yè)務(wù)異常</p>
 * <p>業(yè)務(wù)處理時(shí)，出現(xiàn)異常，可以拋出該異常</p>
 */
public class BusinessException extends  BaseException {
    private static final long serialVersionUID = 1L;
    public BusinessException(IResponseEnum responseEnum, Object[] args, String message) {
        super(responseEnum, args, message);
    }
    public BusinessException(IResponseEnum responseEnum, Object[] args, String message, Throwable cause) {
        super(responseEnum, args, message, cause);
    }
}

public interface BusinessExceptionAssert extends IResponseEnum, Assert {
    @Override
    default BaseException newException(Object... args) {
        String msg = MessageFormat.format(this.getMessage(), args);
        return new BusinessException(this, args, msg);
    }
    @Override
    default BaseException newException(Throwable t, Object... args) {
        String msg = MessageFormat.format(this.getMessage(), args);
        return new BusinessException(this, args, msg, t);
    }
}
@Getter
@AllArgsConstructor
public enum ResponseEnum implements BusinessExceptionAssert {
    /**
     * Bad licence type
     */
    BAD_LICENCE_TYPE(7001, "Bad licence type."),
    /**
     * Licence not found
     */
    LICENCE_NOT_FOUND(7002, "Licence not found.")
    ;
    /**
     * 返回碼
     */
    private int code;
    /**
     * 返回消息
     */
    private String message;
}

private void checkNotNull(Licence licence) {
    ResponseEnum.LICENCE_NOT_FOUND.assertNotNull(licence,"測(cè)試");
}
// 替代下面的方法
private void checkNotNull(Licence licence) {
    if (licence == null) {
        throw new LicenceNotFoundException();
        // 或者這樣
        throw new BusinessException(7001, "Bad licence type.");
    }
}

spring.mvc.throw-exception-if-no-handler-found=true
spring.web.resources.add-mappings=false

@Slf4j
@Component
@ControllerAdvice
@ConditionalOnWebApplication
@ConditionalOnMissingBean(UnifiedExceptionHandler.class)
public class UnifiedExceptionHandler {
    /**
     * 生產(chǎn)環(huán)境
     */
    private final static String ENV_PROD = "prod";
    @Autowired
    private UnifiedMessageSource unifiedMessageSource;
    /**
     * 當(dāng)前環(huán)境
     */
    @Value("${spring.profiles.active}")
    private String profile;
    /**
     * 獲取國(guó)際化消息
     * 這里可以做處理
     * @param e 異常
     * @return
     */
    public String getMessage(BaseException e) {
        String code = "response." + e.getResponseEnum().toString();
        String message = unifiedMessageSource.getMessage(code, e.getArgs());
        if (message == null || message.isEmpty()) {
            return e.getMessage();
        }
        return message;
    }
    /**
     * 業(yè)務(wù)異常
     *
     * @param e 異常
     * @return 異常結(jié)果
     */
    @ExceptionHandler(value = BusinessException.class)
    @ResponseBody
    public ErrorResponse handleBusinessException(BaseException e) {
        log.error(e.getMessage(), e);
        return new ErrorResponse(e.getResponseEnum().getCode(), getMessage(e));
    }
    /**
     * 自定義異常
     *
     * @param e 異常
     * @return 異常結(jié)果
     */
    @ExceptionHandler(value = BaseException.class)
    @ResponseBody
    public ErrorResponse handleBaseException(BaseException e) {
        log.error(e.getMessage(), e);
        return new ErrorResponse(e.getResponseEnum().getCode(), getMessage(e));
    }
    /**
     * Controller上一層相關(guān)異常
     *
     * @param e 異常
     * @return 異常結(jié)果
     */
    @ExceptionHandler({
            NoHandlerFoundException.class,
            HttpRequestMethodNotSupportedException.class,
            HttpMediaTypeNotSupportedException.class,
            MissingPathVariableException.class,
            MissingServletRequestParameterException.class,
            TypeMismatchException.class,
            HttpMessageNotReadableException.class,
            HttpMessageNotWritableException.class,
            // BindException.class,
            // MethodArgumentNotValidException.class
            HttpMediaTypeNotAcceptableException.class,
            ServletRequestBindingException.class,
            ConversionNotSupportedException.class,
            MissingServletRequestPartException.class,
            AsyncRequestTimeoutException.class
    })
    @ResponseBody
    public ErrorResponse handleServletException(Exception e) {
        log.error(e.getMessage(), e);
        int code = CommonResponseEnum.SERVER_ERROR.getCode();
        try {
            ServletResponseEnum servletExceptionEnum = ServletResponseEnum.valueOf(e.getClass().getSimpleName());
            code = servletExceptionEnum.getCode();
        } catch (IllegalArgumentException e1) {
            log.error("class [{}] not defined in enum {}", e.getClass().getName(), ServletResponseEnum.class.getName());
        }
        if (ENV_PROD.equals(profile)) {
            // 當(dāng)為生產(chǎn)環(huán)境, 不適合把具體的異常信息展示給用戶, 比如404.
            code = CommonResponseEnum.SERVER_ERROR.getCode();
            BaseException baseException = new BaseException(CommonResponseEnum.SERVER_ERROR);
            String message = getMessage(baseException);
            return new ErrorResponse(code, message);
        }
        return new ErrorResponse(code, e.getMessage());
    }
    /**
     * 參數(shù)綁定異常
     *
     * @param e 異常
     * @return 異常結(jié)果
     */
    @ExceptionHandler(value = BindException.class)
    @ResponseBody
    public ErrorResponse handleBindException(BindException e) {
        log.error("參數(shù)綁定校驗(yàn)異常", e);
        return wrapperBindingResult(e.getBindingResult());
    }
    /**
     * 參數(shù)校驗(yàn)異常，將校驗(yàn)失敗的所有異常組合成一條錯(cuò)誤信息
     *
     * @param e 異常
     * @return 異常結(jié)果
     */
    @ExceptionHandler(value = MethodArgumentNotValidException.class)
    @ResponseBody
    public ErrorResponse handleValidException(MethodArgumentNotValidException e) {
        log.error("參數(shù)綁定校驗(yàn)異常", e);
        return wrapperBindingResult(e.getBindingResult());
    }
    /**
     * 包裝綁定異常結(jié)果
     *
     * @param bindingResult 綁定結(jié)果
     * @return 異常結(jié)果
     */
    private ErrorResponse wrapperBindingResult(BindingResult bindingResult) {
        StringBuilder msg = new StringBuilder();
        for (ObjectError error : bindingResult.getAllErrors()) {
            msg.append(", ");
            if (error instanceof FieldError) {
                msg.append(((FieldError) error).getField()).append(": ");
            }
            msg.append(error.getDefaultMessage() == null ? "" : error.getDefaultMessage());
        }
        return new ErrorResponse(ArgumentResponseEnum.VALID_ERROR.getCode(), msg.substring(2));
    }
    /**
     * 未定義異常
     *
     * @param e 異常
     * @return 異常結(jié)果
     */
    @ExceptionHandler(value = Exception.class)
    @ResponseBody
    public ErrorResponse handleException(Exception e) {
        log.error(e.getMessage(), e);
        if (ENV_PROD.equals(profile)) {
            // 當(dāng)為生產(chǎn)環(huán)境, 不適合把具體的異常信息展示給用戶, 比如數(shù)據(jù)庫(kù)異常信息.
            int code = CommonResponseEnum.SERVER_ERROR.getCode();
            BaseException baseException = new BaseException(CommonResponseEnum.SERVER_ERROR);
            String message = getMessage(baseException);
            return new ErrorResponse(code, message);
        }
        return new ErrorResponse(CommonResponseEnum.SERVER_ERROR.getCode(), e.getMessage());
    }
}

@Slf4j
@RestControllerAdvice
public class GlobalExceptionHandler {
    /**
     * 沒(méi)有登錄
     * @param request
     * @param response
     * @param e
     * @return
     */
    @ExceptionHandler(NoLoginException.class)
    public Object noLoginExceptionHandler(HttpServletRequest request,HttpServletResponse response,Exception e)
    {
        log.error("[GlobalExceptionHandler][noLoginExceptionHandler] exception",e);
        JsonResult jsonResult = new JsonResult();
        jsonResult.setCode(JsonResultCode.NO_LOGIN);
        jsonResult.setMessage("用戶登錄失效或者登錄超時(shí),請(qǐng)先登錄");
        return jsonResult;
    }
    /**
     * 業(yè)務(wù)異常
     * @param request
     * @param response
     * @param e
     * @return
     */
    @ExceptionHandler(ServiceException.class)
    public Object businessExceptionHandler(HttpServletRequest request,HttpServletResponse response,Exception e)
    {
        log.error("[GlobalExceptionHandler][businessExceptionHandler] exception",e);
        JsonResult jsonResult = new JsonResult();
        jsonResult.setCode(JsonResultCode.FAILURE);
        jsonResult.setMessage("業(yè)務(wù)異常,請(qǐng)聯(lián)系管理員");
        return jsonResult;
    }
    /**
     * 全局異常處理
     * @param request
     * @param response
     * @param e
     * @return
     */
    @ExceptionHandler(Exception.class)
    public Object exceptionHandler(HttpServletRequest request,HttpServletResponse response,Exception e)
    {
        log.error("[GlobalExceptionHandler][exceptionHandler] exception",e);
        JsonResult jsonResult = new JsonResult();
        jsonResult.setCode(JsonResultCode.FAILURE);
        jsonResult.setMessage("系統(tǒng)錯(cuò)誤,請(qǐng)聯(lián)系管理員");
        return jsonResult;
    }
}