使用Java从Google云端硬盘下载文件

Question

My end goal is to write a simple program that downloads one specific Google spreadsheet at the end of each week to my local hard drive. The file will be edited on a week to week basis by other people, and I will constantly need to download the updated version to pull out data and pass to a bash script that I have written. I am now doing this manually, but if I can pull down the spreadsheet in a csv format, can automate the entire process.

I am slightly confused by Google's Documentation. I have copied their example method downloadFile , but am still unclear about the exact parameters that are being passed, and the InputStream return.

If I were to add a main method to call the downloadFile method, what would be example parameters that I pass.

Then, can I use the InputPut stream it returns to save the file is csv format?

Also, is this the only method I need or do is there more to it?

downloadFile method is defined here (left out the import statements):

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) {
            e.printStackTrace();
            return null;
        }
    }
    else {
        return null;
    }
}

Answer 1

For the second parameter you need an instance of the File class. From what I have found out. Google's proprietory File class in it's simplest form can be instantiated with zero arguments. Like this.

File f = new File();

To build a drive object there is an example on how to do it. Scroll down to USE OAUTH 2.0 credentials. https://developers.google.com/drive/credentials