Google Spreadsheet with a service account

问题

I want to access a spreadsheet on Google Drive by using de java Google spreadsheet API. In the past i used the client login method to login but this method is deprecated now. Now I'm trying to use a service account to getting authenticated without interaction with the user because the tool is running in the background i needs to be automated. But i can't get it working. These my code now.

    List<String> SCOPES_ARRAY = Arrays.asList(
            "https://www.googleapis.com/auth/drive.file",
            "https://www.googleapis.com/auth/userinfo.email",
            "https://www.googleapis.com/auth/userinfo.profile",
            "https://docs.google.com/feeds",
            "https://spreadsheets.google.com/feeds");
    credential = new GoogleCredential.Builder()
                .setTransport(transport)
                .setJsonFactory(jsonFactory)
                .setServiceAccountId(
                        "xxxxxx@developer.gserviceaccount.com")
                .setServiceAccountScopes(SCOPES_ARRAY)
                .setServiceAccountPrivateKeyFromP12File(p12)
                .setServiceAccountUser("me@gmail.com")
                .build();
    service = new SpreadsheetService("MonitorV3");
    service.setOAuth2Credentials(credential);

    SPREADSHEET_FEED_URL = new URL("https://spreadsheets.google.com/feeds/spreadsheets/private/full");

    worksheetFeed = service.getFeed(spreadsheet.getWorksheetFeedUrl(),
                    WorksheetFeed.class);

But i'm getting a nullpointerexception when executing the last line. something goes wrong with refresh token. Is there someone seeing what i'm doing wrong?

I made a standalone simple application and now I get following detailded error:

Exception in thread "main" com.google.gdata.util.AuthenticationException: Failed to refresh access token: 401 Unauthorized
at com.google.gdata.client.GoogleAuthTokenFactory$OAuth2Token.refreshToken(GoogleAuthTokenFactory.java:260)
at com.google.gdata.client.GoogleAuthTokenFactory.handleSessionExpiredException(GoogleAuthTokenFactory.java:702)
at com.google.gdata.client.GoogleService.handleSessionExpiredException(GoogleService.java:738)
at com.google.gdata.client.GoogleService.getFeed(GoogleService.java:649)
at com.google.gdata.client.Service.getFeed(Service.java:1017)
at JavaApplication20.printDocuments(JavaApplication20.java:50)
at main.main(main.java:35)

回答1:

I fixed this by using following code:

credential = new GoogleCredential.Builder()
            .setTransport(transport)
            .setJsonFactory(jsonFactory)
            .setServiceAccountId("618982716759-9ele96d95b7gqar6tn2ofa7jrjrudlol@developer.gserviceaccount.com")
            .setServiceAccountPrivateKeyFromP12File(p12)
            .setServiceAccountScopes(SCOPES_ARRAY).build();
            credential.refreshToken();

So without the .setServiceAccountUser("me@gmail.com"). Now it's working without any errors.

回答2:

Another approach to access Google Sheets with Google Service account is:

InputStream inputStream = getAssets().open("service_account_key.json"); // put your service account's key.json file in asset folder.

GoogleCredential googleCredential = GoogleCredential.fromStream(inputStream)
                  .createScoped(Collections.singleton(SheetsScopes.SPREADSHEETS_READONLY));

Important points to note here that:

• You should write your block of code to access Google Sheets in a Thread or Async call.

• If you get any exception like android.os.NetworkOnMainThreadException at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork, then please include these lines before making Async call:

  StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder() .permitAll().build(); StrictMode.setThreadPolicy(policy);

Please refer below documentations for detailed explanation:

https://developers.google.com/sheets/quickstart/android?hl=es-419#step_5_setup_the_sample https://developers.google.com/identity/protocols/OAuth2ServiceAccount#authorizingrequests

Happy Androiding.

来源：https://stackoverflow.com/questions/31287911/google-spreadsheet-with-a-service-account