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。
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。
" Team Drives支持 - 此应用程序适用于Team Drives中的文件。"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,我不认为这是问题所在,因为我可以在代码中与团队驱动器进行互动。
我已阅读Google文档,该文档非常有限:
https://developers.google.com/drive/v3/web/manage-downloads
https://developers.google.com/drive/v3/reference/files/get
我还阅读了几篇文章:
Download files from google drive using java API
但是,我无法找到有效的答案。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Google文档示例编写了代码的下载部分:
https://developers.google.com/drive/v3/web/manage-downloads#examples
以下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。
我很感激帮助。
答案 0 :(得分:2)
此演示不使用服务帐户。
我将演示如何下载Team驱动器文件,并希望它可以为您提供有关项目的见解。
代码的基础取自Drive API Java Quickstart:
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();
}
}
该程序执行后,将打开一个空白浏览器窗口,并将文件下载到您的计算机中。
我生成webContentLink
的方式只是使用Files.get Try-it,并确保将supportsTeamDrives
设置为true
,并将fields
参数设置为{{ 1}},因此它仅返回该值。
当然,您始终可以始终以编程方式使用Java webContentLink
来获取files.get
,但是使用Try-it来获取webContentLink
更容易进行测试。