Question

我想将所有文件列入我的Google云端硬盘帐户。我试着使用这段代码：

@Test
public void hello() throws Exception
{
    Drive service = getDriveService();
    retrieveAllFiles(service);
}

private static final String SERVICE_ACCOUNT_EMAIL = "test@sonora-project.iam.gserviceaccount.com";
private static final String userEmail = "test@gmail.com";

public Drive getDriveService() throws GeneralSecurityException,
    IOException
{
    ClassLoader classLoader = this.getClass().getClassLoader();
    java.io.File path = new java.io.File(classLoader.getResource("test-test123.p12").getFile());

    HttpTransport httpTransport = new NetHttpTransport();
    JacksonFactory jsonFactory = new JacksonFactory();
    GoogleCredential credential = new GoogleCredential.Builder()
        .setTransport(httpTransport)
        .setJsonFactory(jsonFactory)
        .setServiceAccountId(SERVICE_ACCOUNT_EMAIL)
        .setServiceAccountScopes(Arrays.asList(DriveScopes.DRIVE, DriveScopes.DRIVE_FILE, DriveScopes.DRIVE_METADATA))
        .setServiceAccountUser(userEmail)
        .setServiceAccountPrivateKeyFromP12File(path)
        .build();
    Drive service = new Drive.Builder(httpTransport, jsonFactory, null)
        .setApplicationName("sonora project")
        .setHttpRequestInitializer(credential).build();
    return service;
}

private static List<File> retrieveAllFiles(Drive service) throws IOException
{
    List<File> result = new ArrayList<File>();
    Drive.Files.List request = service.files().list();

    do
    {
        try
        {
            FileList files = request.execute();

            result.addAll(files.getFiles());
            request.setPageToken(files.getNextPageToken());
        }
        catch (IOException e)
        {
            System.out.println("An error occurred: " + e);
            request.setPageToken(null);
        }
    }
    while (request.getPageToken() != null
        && request.getPageToken().length() > 0);

    return result;
}

当我尝试列出文件时，我收到错误401。你知道我怎么解决这个问题吗？

当我只运行身份验证部分时，代码正在运行。

Answer 1

正如此SO question中所述，您可能因为访问令牌过期而导致错误，并且您必须使用刷新令牌获取新错误。可以通过调用refreshToken来处理令牌到期。如果该呼叫失败并且出现＆＃34;无效凭证＆＃34;错误，问题可能是用户已撤销访问权限。对于撤销访问和令牌到期以外的所有问题，最好的解决方法是重定向用户通过OAuth对话框重新授予访问权限。

401 Unauthorized - 无法列出Google Drive文件

1 个答案: