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.
That's the wrong question. You don't decide to write your HTML based on how somebody decided to write the servlet. It's the other way around. You write your HTML and decide whether to use GET or POST based on the usual meaning of those methods. Then you write the servlet which processes the request and use doGet or doPost based on how you decided to write your HTML.