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.
Do you have your application in a WAR file (wiki.war)? If yes, then you simply need to copy wiki.war to the webapps directory of your Tomcat installation. After starting Tomcat, it will deploy your application automatically on http://<server>:<port>/wiki
To customize this, you need to edit the <Context> element of your webapp in server.xml. See the documentation for more info.