This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
As another suggestion, I highly highly recommend that you move the JDBC code from the Servlet an place it in a plain old Java object that the Servlet could call.
By having JDBC code in your Servlet, you are tightly coupling JDBC with your Servlet. Unless this is a class homework or one-off quick test. You would not want the code you currently have in production.
Well a Servlet is Java code right? So to call a plain old Java object, you just create an instance of it in your Servlet, then call one method that will bo your Database stuff for you and return the information that you want, that you then put into the Response object to send back to the client in any way you wish.