This week's book giveaway is in the Agile and other Processes forum. We're giving away four copies of The Mikado Method and have Ola Ellnestam and Daniel Brolund on-line! See this thread for details.
You should be able to open a Connection and open a binary stream you can write to using a PreparedStatement. In our database we store images as blobs and upload them with this methodology. Unfortunately the source isn't something I can post here, but that should give you an idea of where to look.