How to create a custom user login account page where user can upload papers that stores in mysql database?

Suppose i've already made a Dynamic page using sessions in servlet that generates a user login page and in that account if User has uploaded paper in his own account, after he logs in again , that should be there already.

How can we stored image in database, and how can we transfer image to another account also known to be reviewer that gets to be review the paper uploaded by user in his account.

How can this be possible, Anyone please help me, Because i have no idea, i am studying Servlets right now. Please Help. Thanks