如何使用Java中的Google Drive API库强制从Google Team Drive下载文件 [英] How to force download of file from Google Team Drive using Google Drive API libraries in Java
问题描述
在我的应用程序中,当用户点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。
In my application, I am trying to force a download of a file from a Google Team Drive when the user clicks on a link on a form in my application.
一些更新:
-
我的代码可以上传到Team Drive,也可以在Team Drive上创建文件夹。
I have code that can upload to the Team Drive as well as create folders on the Team Drive.
Team Drives支持 - 此应用程序可与Team Drives中的文件一起正常运行。无法启用Google Drive API设置 - 我可以选中此框,但我无法点击保存更改按钮,因为该按钮始终处于禁用状态。但是,我不认为这是问题,因为我可以在我的代码中与团队驱动器进行交互。
The "Team Drives support - This application works properly with files in Team Drives." on the Google Drive API settings CANNOT be enabled - I can check this box, but I cannot click the Save Changes button, since the button is always disabled. However, I don't think that is the issue, since I can interact with the Team Drive in my code.
我已阅读Google文档,该文档非常有限:
I have read the Google documentation, which is very limited:
https://developers.google.com/drive/v3/web/manage-downloads
https://developers.google.com/drive/v3/reference/files/get
我还读了几篇文章:
但是,我找不到有效的答案。我已经构建了一些使用服务帐户的代码。代码设置驱动器服务并使用服务帐户作为凭据。我根据此Google文档示例提供了代码的下载部分:
But, I can't find an answer that works. I have built some code which uses a Service Account. The code sets the drive service and uses the Service Account as the credentials. I based the download part of my code from this Google documentation example:
https://developers.google.com/drive/v3/web/manage-downloads#examples
以下是我正在使用的代码:
Here is the code I am using:
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某些内容或不正确,请随时提供我应该使用的示例或正确的代码。
When my code runs, there are no errors and nothing happens. I am guessing I am missing some code in the downloadFile function. If I am missing something or incorrect in my coding, please feel free to provide examples or the correct code I should be using.
我感谢您的帮助。
推荐答案
此演示不使用服务帐户。
我将演示如何下载团队驱动器文件,并希望它能让您深入了解您的项目。
I'm just going to demonstrate how I downloaded a Team drive file and hopefully it gives you insight on your project.
代码的基础取自 Drive API Java快速入门:
public static void main(String... args) throws IOException, GeneralSecurityException {
// Build a new authorized API client service.
final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
Drive service = new Drive.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials(HTTP_TRANSPORT))
.setApplicationName(APPLICATION_NAME)
.build();
//this is what you're looking for - a way to download a file using 'webContentLink'
try {
Desktop desktop = java.awt.Desktop.getDesktop();
//place your webContentLink in the oURL variable
URI oURL = new URI("https://drive.google.com/a/google.com/uc?id=YOUR_FILE_ID&export=download");
desktop.browse(oURL);
} catch (Exception e) {
e.printStackTrace();
}
}
执行时,此程序会打开一个空白的浏览器窗口,将文件下载到您的计算机。
Upon execution, this program opens a blank browser window and downloads the file to your computer.
我生成 webContentLink
的方式只是使用 Files.get试一试并确保我设置 supportsTeamDrives
到 true
并将 fields
参数设置为 webContentLink
所以它只返回。
The way I generated the webContentLink
was just use the Files.get Try-it and made sure I set supportsTeamDrives
to true
and also setting fields
parameter to webContentLink
so it returns just that.
当然,您始终可以通过编程方式使用Java files.get
来获取 webContentLink
但使用Try-it获取 webContentLink
更容易进行测试。
Of course you can always use the Java files.get
programmatically to fetch webContentLink
but fetching the webContentLink
using the Try-it was easier for testing purposes.
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