工具类--给不缺确定的实体类中的某个固定字段赋值

/**
 * 需要将masterDataOperateDTO 实体类中的groupId，companyId，创建人，赋值给传入的实体
 * @param t
 * @param masterDataOperateDTO
 * @param <T>
 * @return
 * @throws Exception
 */
public static <T> T gentEntity(T t,ResultModel<MasterDataOperateDTO> masterDataOperateDTO) throws Exception{
    if (SettingConst.RETCODE_SUCCESS.equals(masterDataOperateDTO.getRetCode())) {
        MasterDataOperateDTO result = masterDataOperateDTO.getResult();

        Class<?> aClass = t.getClass();
        Field[] declaredFields = aClass.getDeclaredFields();

        for (Field field:declaredFields) {
            //添加权限
            field.setAccessible(true);
            
            //根据field.getType() 反射获取字段类型，可以扩展
            if("groupId".equals(field.getName())){
                if(StringUtils.isNotBlank(result.getGroupId())){
                    field.set(t,Long.valueOf(result.getGroupId()));
                }
            }
            if("companyId".equals(field.getName())){
                if(StringUtils.isNotBlank(result.getCompanyId())){
                    field.set(t,Long.valueOf(result.getCompanyId()));
                }

            }
            if("createUser".equals(field.getName())){
                if(StringUtils.isNotBlank(result.getOperator())) {
                    field.set(t, result.getOperator());
                }
            }
        }
    }

    return t;
}


调用

ResultModel<MasterDataOperateDTO> masterDataOperateDTOResultModel = new AuthorityUtils(clientMasterDataService).postDataEntity(unusedGasDTO.getGroupId(), unusedGasDTO.getCompanyId());
UnusedGasDTO unusedGasDTO1 = AuthorityUtils.gentEntity(unusedGasDTO, masterDataOperateDTOResultModel);

byte[] bytes = clientUnusedGasService.queryUnusedGasListExcel(unusedGasDTO1);