前端参数统一校验工具类ValidParamUtils

1，前端参数不可信，对于后端开发人员来说应该是一条铁律，所以对于前端参数的校验，必不可少，而统一的前端参数校验工具，对我们进行参数校验起到事半功倍的效果

2，统一参数校验工具ValidParamUtils

public class ValidParamUtils {

    public static void validInputParams(BindingResult bindingResult) throws ParameterValidErrorException {
        if(bindingResult.hasErrors()) {           //如果对于字段的校验出现错误，抛出统一自定义参数异常
            String errorMessage = ValidParamUtils.errorParamInfo(bindingResult);
            if (!StringUtils.isBlank(errorMessage)){
                throw new ParameterValidErrorException(ErrorCode.BAD_REQUEST, errorMessage);
            }
            throw new ParameterValidErrorException(ErrorCode.BAD_REQUEST);
        }
    }

    public static String errorParamInfo(BindingResult bindingResult) {      //从绑定结果中，获取错误信息
        FieldError fe = bindingResult.getFieldError();

        if(fe != null) {
            return fe.getDefaultMessage();
        }

        ObjectError oe = bindingResult.getGlobalError();
        if(oe != null) {
            return oe.getDefaultMessage();
        }

        return "";
    }

3，自定义参数异常

public abstract class ParamErrorException extends RuntimeException {

    /**
     *
     */
    private static final long serialVersionUID = 1L;
    private ErrorCode errorCode;

    public BaseException() {
    }

    public BaseException(ErrorCode errorCode) {
        super(errorCode.getName());
        this.errorCode = errorCode;
    }

    public BaseException(ErrorCode errorCode, String msg) {
        super(msg);
        this.errorCode = errorCode;
    }

    public ErrorCode getErrorCode() {
        return errorCode;
    }

    public void setErrorCode(ErrorCode errorCode) {
        this.errorCode = errorCode;
    }
}

4,使用自定义的统一参数校验工具

 @PostMapping(value = "/manage/ads/theme/add")
    public Result addThemeActivity(@RequestBody @Validated(value = {AddOrUpdateThemeActivityRequest.AddThemeActivityGroup.class}) AddOrUpdateThemeActivityRequest addOrUpdateThemeActivityRequest, BindingResult bindingResult) {
        LOGGER.info("manage addThemeActivity param:{}", JSON.toJSONString(addOrUpdateThemeActivityRequest));        //参数校验
        ValidParamUtils.validInputParams(bindingResult);
        Integer themeActivityNum = themeActivityService.selectThemeActivityByTitleAndId(addOrUpdateThemeActivityRequest.getTitle(), null);
        if (themeActivityNum > 0) {
            LOGGER.warn(String.format("%s. title:%s", ErrorCode.MANAGE_PROJECT_THEME_TITLE_EXIST.getName(), addOrUpdateThemeActivityRequest.getTitle()));
            return Result.builder().failed(ErrorCode.MANAGE_PROJECT_THEME_TITLE_EXIST).build();
        }
        managerBannerService.insertThemeActivityInfo(addOrUpdateThemeActivityRequest);
        sendBizLog(addOrUpdateThemeActivityRequest.getTitle());
        LOGGER.info("manage addThemeActivity success. ");
        return Result.builder().data("新增专题活动成功").success().build();
    }

原文地址：https://www.cnblogs.com/webwangbao/p/9254245.html