带有服务帐户的 Google 电子表格

Question

我想使用 de java Google 电子表格 API 访问 Google Drive 上的电子表格。过去我使用客户端登录方法登录，但现在已弃用此方法。 现在我正在尝试使用服务帐户在不与用户交互的情况下进行身份验证，因为该工具在后台运行，我需要自动化。但我无法让它工作。这些是我现在的代码。

    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);

但是在执行最后一行时我得到了一个空指针异常。刷新令牌出了点问题。有人看到我做错了吗？

我做了一个独立的简单应用程序，现在我收到以下详细错误：

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)

Answer 1

GoogleCredential 目前已弃用。相反，如果您需要使用服务帐户访问 Google 表格，请使用 Google OAuth2 library。

使用示例：

// A few common declarations:
private static final String APPLICATION_NAME = "My Google Sheets Application";
private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
private static final List<String> SCOPES = Collections.singletonList(SheetsScopes.SPREADSHEETS_READONLY);

// Initializing the service:
final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
GoogleCredentials googleCredentials;
try(InputStream inputSteam = <YOURCLASS>.class.getResourceAsStream("/path/to/credentials/file.json")) {
  googleCredentials = GoogleCredentials.fromStream(credentialsStream).createScoped(SCOPES)
}
Sheets service = Sheets.Builder(HTTP_TRANSPORT, JSON_FACTORY, new HttpCredentialsAdapter(googleCredentials))
            .setApplicationName(APPLICATION_NAME)
            .build()

Answer 2

我使用以下代码解决了这个问题：

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

所以没有 .setServiceAccountUser("me@gmail.com")。现在它可以正常工作了。

Answer 3

使用 Google 服务帐户访问 Google 表格的另一种方法是：

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));

这里需要注意的重点：

• 您应该编写代码块以在线程或异步调用中访问 Google 表格。

• 如果您在 android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork 处遇到任何异常，例如 android.os.NetworkOnMainThreadException，请在进行异步调用之前包含这些行：

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

详细解释请参考以下文档：

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

Android 快乐。