Change Tomcat Port from 8080

For changing Tomcat port you need to change the connection port in server.xml  :
 
sudo vim /etc/tomcat8/server.xml

Then search for “Connector port” and change the port number (example 8080 to 7000):

   Connector port="7000" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />

In example above we change the port from 8080 to 7000 
 
Then you need to restart tomcat :
 
sudo service tomcat8 restart