使用Google表格API和服务帐户时禁止使用403

我有一个使用服务帐户的应用程序（因为它从一个cron作业运行，因此我无法通过浏览器中的用户进行授权）。 以下是我创建工作表服务的方法：

private static final String APPLICATION_NAME = "my app"; private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance(); private static HttpTransport HTTP_TRANSPORT; static { try { HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport(); } catch (GeneralSecurityException | IOException e) { e.printStackTrace(); } } private static final List SCOPES = Collections.singletonList(SheetsScopes.SPREADSHEETS); private static Credential authorize() throws IOException, GeneralSecurityException { GoogleCredential credential = GoogleCredential.fromStream(new FileInputStream("key.json"), HTTP_TRANSPORT, JSON_FACTORY); credential = credential.createScoped(SCOPES); return credential; } static Sheets getSheetsService() throws IOException, GeneralSecurityException { Credential credential = authorize(); return new Sheets.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential).setApplicationName(APPLICATION_NAME).build(); } 

每次运行它时，都会出现“com.google.api.client.googleapis.json.GoogleJsonResponseException：403 Forbidden”错误。 有关如何解决此问题的任何想法？