在端点类的创建方法 - 谷歌应用程序引擎 [英] Create method in endpoint class - Google App Engine

问题描述

我是新来的App Engine应用程序development.I想在我的实体端点类来创建自定义的方法。对于我使用 @ApiMethod 标注在端点class.The问题定义自定义的方法是，当我从我的Andr​​oid客户端调用此方法会抛出 IOException异常。我不知道什么是我的code中的问题。请指导我。
谢谢你。

端点code：

  @Api（NAME =feedmasterendpoint，命名空间= @ApiNamespace（ownerDomain =sampleregistrationapp.com，OWNERNAME =sampleregistrationapp.com，packagepath的=））
公共类FeedMasterEndpoint {    @燮pressWarnings（未登记）
        @ApiMethod（NAME =getUserFeed，列举HTTPMethod = HttpMethod.GET）
        公众的ArrayList＆LT;串GT; getUserFeed（@Named（userId_fk）字符串ID）{
            EntityManager的经理= NULL;
            ArrayList的＆LT;串GT; feedList =新的ArrayList＆LT;串GT;（）;
            尝试{
                经理= getEntityManager（）;
                查询查询=经理
                        .createQuery（从FeedMaster选择f.feedUrl f其中f.userId_fk =：用户id）;
                query.setParameter（用户id，身份证）;
                feedList =（ArrayList的＆LT;串GT;）query.getResultList（）;
            } {最后
                mgr.close（）;
            }
            返回feedList;
        }
}
 

Android客户端code：

  StringCollection urlList =新StringCollection（）;
Feedmasterendpoint.Builder建设者=新Feedmasterendpoint.Builder（
                        AndroidHttp.newCompatibleTransport（），
                        新JacksonFactory（），新的Htt prequestInitializer（）{
                            公共无效初始化（HTT prequest为arg0）
                                    抛出IOException                            }
                        }）;                Feedmasterendpoint终点= CloudEndpointUtils.updateBuilder（
                        建设者）.build（）;                。urlList = endpoint.getUserFeed（PARAMS [0]）执行（）; //它抛出IOException异常
 

解决方案

很多搜索后我才知道，可能是没有这样的设备，从数据存储读取应用程序引擎的特定列，并解决这个问题我拿来整实体，它为我工作。

I am new to App Engine application development.I want to create custom method in my entity endpoint class. For that i am using @ApiMethod annotation to define custom method in endpoint class.The problem is that when i invoke this method from my android client it throws IOException. I don't know what is the problem with my code. Please guide me. Thank you.

Endpoint code :

@Api(name = "feedmasterendpoint", namespace = @ApiNamespace(ownerDomain = "sampleregistrationapp.com", ownerName = "sampleregistrationapp.com", packagePath = ""))
public class FeedMasterEndpoint {

    @SuppressWarnings("unchecked")
        @ApiMethod(name = "getUserFeed", httpMethod = HttpMethod.GET)
        public ArrayList<String> getUserFeed(@Named("userId_fk") String id) {
            EntityManager mgr = null;
            ArrayList<String> feedList = new ArrayList<String>();
            try {
                mgr = getEntityManager();
                Query query = mgr
                        .createQuery("select f.feedUrl from FeedMaster f where f.userId_fk= :userId");
                query.setParameter("userId", id);
                feedList = (ArrayList<String>) query.getResultList();
            } finally {
                mgr.close();
            }
            return feedList;
        }
}

Android client code:

StringCollection urlList = new StringCollection();
Feedmasterendpoint.Builder builder = new Feedmasterendpoint.Builder(
                        AndroidHttp.newCompatibleTransport(),
                        new JacksonFactory(), new HttpRequestInitializer() {
                            public void initialize(HttpRequest arg0)
                                    throws IOException {

                            }
                        });

                Feedmasterendpoint endpoint = CloudEndpointUtils.updateBuilder(
                        builder).build();

                urlList = endpoint.getUserFeed(params[0]).execute(); //It throws IOException

解决方案

After lot of searching i got to know that might be there is no such facility to fetch particular column from Datastore of app engine and to solve that problem i fetched entire entity and it worked for me.

这篇关于在端点类的创建方法 - 谷歌应用程序引擎的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！