Configure embedded tomcat server to only listen to localhost connections

Question

I am running an application with an embedded tomcat server which by default listens to any connections (binds to 0.0.0.0). I am trying to bind the server to listen to localhost connections only. How can I achieve this within my launcher class? (without using any special configuration files)

        tomcat.setPort(8080);
        tomcat.setHostname("localhost");
        ...(adding webapp and servlet)...
        tomcat.start();
        tomcat.getServer().await();