import com.google.api.client.extensions.appengine.datastore.AppEngineDataStoreFactory; //导入依赖的package包/类
@Override
	public void configure(Binder binder) {

//		binder.bind(HttpTransport.class).toInstance(new UrlFetchTransport());
		binder.bind(HttpTransport.class).toInstance(new NetHttpTransport());

		/*
		 * TODO HH?
		 */
		binder.bind(DateFormat.class).toInstance(
				new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss.SSS'Z'"));

		binder.bind(JsonFactory.class).toInstance(
				JacksonFactory.getDefaultInstance());

		/*
		 * Global instance of the {@link DataStoreFactory}. The best practice is
		 * to make it a single globally shared instance across your application.
		 */
		binder.bind(DataStoreFactory.class).toInstance(
				AppEngineDataStoreFactory.getDefaultInstance());
		binder.bind(AppEngineDataStoreFactory.class).in(Singleton.class);
	}
 

import com.google.api.client.extensions.appengine.datastore.AppEngineDataStoreFactory; //导入依赖的package包/类
@Override
public void initialise(UpdatableInjectionContext injectionContext) {
    super.initialise(injectionContext);

    // for gmail API as the setup stores the creds established at setup time in DS
    injectionContext.inject(AppEngineDataStoreFactory.getDefaultInstance()).as(DataStoreFactory.class);
    injectionContext.inject(UrlFetchTransport.getDefaultInstance()).as(HttpTransport.class);

    Class<? extends Mailer> mailerClass = Environment.is(Environment.DEV) ? LoggingMailer.class : GmailMailer.class;
    injectionContext.inject(mailerClass).as(Mailer.class);
}
 

import com.google.api.client.extensions.appengine.datastore.AppEngineDataStoreFactory; //导入依赖的package包/类
public static DataStore<StoredCredential> getDataStore()
  throws IOException
{
  AppEngineDataStoreFactory factory = AppEngineDataStoreFactory.getDefaultInstance();
  return StoredCredential.getDefaultDataStore( factory );
}
 

import com.google.api.client.extensions.appengine.datastore.AppEngineDataStoreFactory; //导入依赖的package包/类
public static DataStore<StoredCredential> getDataStore()
    throws IOException
{
  AppEngineDataStoreFactory factory = AppEngineDataStoreFactory.getDefaultInstance();
  return StoredCredential.getDefaultDataStore( factory );
}