Change Tomcat port to 80 with Apache?
You can use mod_proxy for passing the data over to tomcat.
you could use something in the lines of:
ProxyPass /myservlet http://localhost:8080/myservlet
ProxyPassReverse /myservlet http://localhost:8080/myservlet
That will proxy the data to the tomcat instance and rewrite replies so that they match the given path. I would recommend using something like nginx for plain proxying, but if you already need apache for something, it can be done with it too.