I am trying to use Google Service Accounts to access Fusion table from my AppENgine Java App. This code snippet is used to obtain OAuth access token:
ArrayList<String> scopes = new ArrayList<String>();
scopes.add("https://www.googleapis.com/auth/fusiontables");
DataAccessService fusionTablesService = EnvironmentServic.getEnvironmentService().getService(DataAccessService.class);
String token = AppIdentityServiceFactory.getAppIdentityService().getAccessToken(scopes).getAccessToken();
I was able to successfully obtain access token, but when I am trying to execute CREATE TABLE query i got:
<HTML>
<HEAD>
<TITLE>Login required</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<H1>Login required</H1>
<H2>Error 401</H2>
</BODY>
</HTML>
Do service account works with Fusion Tables?
I'm not terribly familiar with Fusion Tables, but it is likely that you need to either:
1) Grant permission to the service account (the "email address" is found in the admin console) to access the table. This would probably happen through The sample at https://developers.google.com/appengine/articles/prediction_service_accounts may be helpful as a starting point for this process.
2) Log in a user who has access to the table (or whose data you're trying to access) and have them authorize access for the application using the three-legged OAuth flow. If you're accessing data that is owned by an end user (ex: joe@gmail.com), then you'll probably need to do this.
Hope this helps.
来源：https://stackoverflow.com/questions/10338497/fusion-table-and-google-service-accounts