（Java）下载网址无效 [英] (Java) Download URL not working

问题描述

我正在努力尝试使用谷歌驱动器API下载文件。我只是写代码，应该从我的驱动器下载文件到我的电脑上。我终于进入了一个认证阶段，可以查看文件元数据。出于某种原因，我仍然无法下载文件。我收到的downLoadURL如下所示：

I am battling with trying to download files using the google drive API. I'm just writing code that should download files from my drive onto my computer. I've finally got to a stage where I am authenticated and can view the file metadata. For some reason, I'm still unable to download files. The downLoadURL I get looks like:

https://doc-04-as-docs.googleusercontent.com/docs/securesc/XXXXXXXXXXXXXX/0B4dSSlLzQCbOXzAxNGxuRUhVNEE?e=download&gd=true

当我运行我的代码或将其复制并粘贴到浏览器中时，URl不会下载任何内容。但是，在浏览器中，当我删除URL的& gd = true部分时，它会下载该文件。

This URl isn't downloading anything when I run my code or when I copy and paste it in a browser. But, in the browser, when i remove the "&gd=true" part of the URL it downloads the file.

我的下载方法是直接从Google驱动器API文档：

My download method is straight out of the google drive API documentation:

public static InputStream downloadFile(Drive service, File file) {
  if (file.getDownloadUrl() != null && file.getDownloadUrl().length() > 0) {
    try {
      System.out.println("Downloading: "+ file.getTitle());
      return service.files().get(file.getId()).executeMediaAsInputStream();
    } catch (IOException e) {
      // An error occurred.
      e.printStackTrace();
      return null;
    }
  } else {
    // The file doesn't have any content stored on Drive.
    return null;
  }
}

任何人都知道这是怎么回事？

Anyone know whats going on here?

在此先感谢。

推荐答案

由于您使用Drive v2，方法（同样在文档上）是为了获得 InputStream 通过 HttpRequest 对象。

Since you're using Drive v2, a different approach (also on the documentation) is for you to get the InputStream thru the HttpRequest object.

/**
* Download a file's content.
*
* @param service Drive API service instance.
* @param file Drive File instance.
* @return InputStream containing the file's content if successful,
* {@code null} otherwise.
*/
private static InputStream downloadFile(Drive service, File file) {
    if (file.getDownloadUrl() != null && file.getDownloadUrl().length() > 0) {
        try {
            HttpResponse resp =
            service.getRequestFactory().buildGetRequest(new GenericUrl(file.getDownloadUrl()))
            .execute();
            return resp.getContent();
        } catch (IOException e) {
            // An error occurred.
            e.printStackTrace();
            return null;
        }
    } else {
        // The file doesn't have any content stored on Drive.
        return null;
    }
}

这篇关于（Java）下载网址无效的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！