Well, my understanding is If you're using Tomcat, you want yout html to be the user interface to some background logic such as servlet/ejb. if that's correct, just write your html, deploy that using a deploytool, make the deployment descriptor. the deploytool will create a .war file for you and then put the war file inwebapps directory and then restart tomcat server. that will solve it.
usually when you're talking about tomcat , it means you're trying to make a web app so that's the way to do it usually.