public List<Item> getItemsByTemplateid(String hostid, String templateid) {
    // テンプレートIDに紐づくアイテムを取得
    ApplicationGetParam applicationGetParam = new ApplicationGetParam();
    // hostidにtemplateidをセットする必要がある
    applicationGetParam.setHostids(Arrays.asList(templateid));
    applicationGetParam.setOutput("extend");
    List<Application> applications = zabbixClient.application().get(applicationGetParam);

    List<Item> items = new ArrayList<Item>();
    for (Application application : applications) {
      ItemGetParam itemGetParam = new ItemGetParam();
      itemGetParam.setApplication(application.getName());
      itemGetParam.setHostids(Arrays.asList(hostid));
      itemGetParam.setOutput("extend");

      items.addAll(zabbixClient.item().get(itemGetParam));
    }

    return items;
  }