How Can I generate a file in RemoteServiceServlet and send it to a user?

问题

Maybe I can disable RemoteServiceServlet response serialization or define RemoteService interface with method that returns ServletOutputStram? I would like not to save request in any database to file to process it in another request.

回答1:

If you want to provide a download to the user, you can do it like this:

1. Write another servlet which simply writes out the file content through the ServletResponse
2. Make sure you have a binary header and provide the filename in there, too.
3. In your client, make an <iframe ..> (The widget class for this is Frame) and point its url to your new servlet.

Due to the binary header your browser will now provide the user with a Save as.. popup. That should be all.

来源：https://stackoverflow.com/questions/7086114/how-can-i-generate-a-file-in-remoteserviceservlet-and-send-it-to-a-user