在我的应用程序中，当用户单击我的应用程序中表单上的链接时，我试图强制从Google Team Drive下载文件。

一些更新：

1. 我有可以上传到Team Drive以及在Team Drive上创建文件夹的代码。

2. “团队驱动器支持-此应用程序可与团队驱动器中的文件正常工作”。无法启用Google Drive API设置上的-我可以选中此框，但是由于总是禁用该按钮，因此无法单击“保存更改”按钮。但是，我认为这不是问题，因为我可以在代码中与Team Drive进行交互。

我已阅读了非常有限的Google文档：

https://developers.google.com/drive/v3/web/manage-
downloads

https://developers.google.com/drive/v3/reference/files/get

我还阅读了一些帖子：

使用Java API从Google
Drive下载文件

但是，我找不到有效的答案。我建立了一些使用服务帐户的代码。该代码设置驱动器服务并将服务帐户用作凭据。我基于此Google文档示例的代码下载部分：

https://developers.google.com/drive/v3/web/manage-
downloads#examples

这是我正在使用的代码：

public static void downloadFile(String fileID) {
    // Set the drive service...
    Drive service = null;
    try {
        service = getDriveService();
    } catch (IOException e) {
        e.printStackTrace();
    }
    OutputStream outputStream = new ByteArrayOutputStream();
    try {
        service.files().get(fileID).executeMediaAndDownloadTo(outputStream);
        // NEED CODE HERE???????


    } catch (IOException e) {
        e.printStackTrace();
    }
}

/**
 * Build and return an authorized Drive client service.
 * 
 * @return an authorized Drive client service
 * @throws IOException
 */
public static Drive getDriveService() throws IOException {
    Logger.info("GoogleDrive: getDriveService: Starting...");
    GoogleCredential credential = null;
    Drive googleDrive = null;
    try {
        credential = authorize();
        Logger.info("GoogleDrive: getDriveService: Credentials set...");
        googleDrive = new Drive.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
                .setApplicationName(APPLICATION_NAME).build();
    } catch (IOException ex) {
        System.out.println(ex.toString());
        ex.printStackTrace();
    }
    return googleDrive;
}

/**
 * Creates an authorized Credential object.
 * 
 * @return an authorized Credential object.
 * @throws IOException
 */
@SuppressWarnings("deprecation")
public static GoogleCredential authorize() throws IOException {
    GoogleCredential credential = null;
    String credentialsFileName = "";
    try {
        Logger.info("GoogleDrive: authorize: Starting...");

        Logger.info("GoogleDrive: authorize: Getting credentialsFileName path...");
        credentialsFileName = Configuration.root().getString("google.drive.credentials.file");
        Logger.info("GoogleDrive: authorize: credentialsFileName = " + credentialsFileName);

        Logger.info("GoogleDrive: authorize: Setting InputStream...");
        InputStream in = GoogleDrive.class.getClassLoader().getResourceAsStream(credentialsFileName);
        if (in == null) {
            Logger.info("GoogleDrive: authorize: InputStream is null");
        }
        Logger.info("GoogleDrive: authorize: InputStream set...");

        Logger.info("GoogleDrive: authorize: Setting credential...");
        credential = GoogleCredential.fromStream(in, HTTP_TRANSPORT, JSON_FACTORY)
                .createScoped(Collections.singleton(DriveScopes.DRIVE));
    } catch (IOException ex) {
        System.out.println(ex.toString());
        System.out.println("Could not find file " + credentialsFileName);
        ex.printStackTrace();
    }
    Logger.info("GoogleDrive: authorize: Ending...");
    return credential;
}

当我的代码运行时，没有错误，也没有任何反应。我猜我在downloadFile函数中缺少一些代码。如果我在编码中遗漏了一些东西或不正确，请随时提供示例或我应该使用的正确代码。

感谢您的帮助。