apollo-adminservice/src/main/java/com/ctrip/framework/apollo/adminservice/controller/ItemController.java/ItemController/findItems
class ItemController:  @GetMapping("/apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName}/items")
  public List<ItemDTO> findItems(@PathVariable("appId") String appId,
                                 @PathVariable("clusterName") String clusterName,
                                 @PathVariable("namespaceName") String namespaceName) {
    return BeanUtils.batchTransform(ItemDTO.class, itemService.findItemsWithOrdered(appId, clusterName, namespaceName));
  }