This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff 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.