在端点类的创建方法 - 谷歌应用程序引擎应用程序、引擎、方法
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Android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.
