Reading the Google Docs API I find this:
Downloading
Files cannot be downloaded in a format other than the one in which they were originally uploaded. The download URL for files looks something like this:
https://doc-04-20-docs.googleusercontent.com/docs/secure/m7an0emtau/WJm12345/YzI2Y2ExYWVm?h=16655626&e=download&gd=true
Given a public Google Documents file URL, say,
https://docs.google.com/open?id=0B1-vl-dPgKm_NTNhZjZkMWMtZjQxOS00MGE1LTg2MjItNGVjYzdmZjYxNmQ5
How can I turn it into a download link?
Hi nightcracker try this:
https://docs.google.com/uc?export=download&id=DOCIDGOESHERE
I've only tried it with one pdf and it worked ok so maybe having a play with that will help....
All the best,
Dave
For a published document, the method suggested by dkcwd did not worked.
I have found the following method in this page. Given a publish document URL, such as
https://docs.google.com/document/pub?id=[ID]
The download link is
https://docs.google.com/document/export?format=[FORMAT]&id=[ID]
where [FORMAT] can have one of these values: pdf, doc, docx, oo, rtf, txt.
来源：https://stackoverflow.com/questions/9045392/getting-the-download-link-for-a-public-google-docs-file