apollo-portal/src/main/java/com/ctrip/framework/apollo/openapi/server/service/ServerItemOpenApiService.java/ServerItemOpenApiService/createItem
class ServerItemOpenApiService:  @Override
  public OpenItemDTO createItem(String appId, String env, String clusterName, String namespaceName,
      OpenItemDTO itemDTO) {

    ItemDTO toCreate = OpenApiBeanUtils.transformToItemDTO(itemDTO);

    //protect
    toCreate.setLineNum(0);
    toCreate.setId(0);
    toCreate.setDataChangeLastModifiedBy(toCreate.getDataChangeCreatedBy());
    toCreate.setDataChangeLastModifiedTime(null);
    toCreate.setDataChangeCreatedTime(null);

    ItemDTO createdItem = itemService.createItem(appId, Env.valueOf(env),
        clusterName, namespaceName, toCreate);
    return OpenApiBeanUtils.transformFromItemDTO(createdItem);
  }