public Rule getRuleByBusinessIdAndRuleType(String businessId, String ruleType) {
TDataCenterRule rule = ruleService.getByBusinessIdAndRuleType(businessId, ruleType);
return Optional.ofNullable(rule).map(ruleMapping::toVo).orElse(null);
}中的ruleMapping::toVo用到了
@Mapping(source = “id”, target = “ruleId”)
Rule toVo(TDataCenterRule rule);
TDataCenterRule中private String id;怎么转换成Rule中的private Long id;的，类型不同是怎么转换的