Question

我是Google Drive集成的新手。我将图片保存在Google驱动器中，并通过以下方法获取了该文件。

File file = getDriveService().files().get(fileId).execute();

现在，当我尝试将此文件转换为InputStream并在HttpResponse中写入此InputStream时，文件将返回，但不会显示图像。

public InputStream convertGoolgeFileToInputStream( String fileId ) throws IOException {

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        getDriveService().files().get(fileId).executeAndDownloadTo(outputStream);
        InputStream in = new ByteArrayInputStream(outputStream.toByteArray());
        return in;

        //return getDriveService().files().get(fileId).executeAsInputStream();
}

Answer 1

您可能想尝试检查下载示例Drive sample

private static void downloadFile(boolean useDirectDownload, File uploadedFile)
      throws IOException {
    // create parent directory (if necessary)
    java.io.File parentDir = new java.io.File(DIR_FOR_DOWNLOADS);
    if (!parentDir.exists() && !parentDir.mkdirs()) {
      throw new IOException("Unable to create parent directory");
    }
    OutputStream out = new FileOutputStream(new java.io.File(parentDir, uploadedFile.getTitle()));

    MediaHttpDownloader downloader =
        new MediaHttpDownloader(httpTransport, drive.getRequestFactory().getInitializer());
    downloader.setDirectDownloadEnabled(useDirectDownload);
    downloader.setProgressListener(new FileDownloadProgressListener());
    downloader.download(new GenericUrl(uploadedFile.getDownloadUrl()), out);
  }

Java：如何将com.google.api.services.drive.model.File转换为InputStream？

1 个答案: