How client server and deployed Java code connects each other?

Generally we learnt through http connection client server connection happens,my q is we deploy .class files in server say tomcat,do tomcat understands .class files? As I learnt .class files are byte code understood by jvm means as per my understanding everything(protocal-webserver-javacode )first converts to binary code and then communicates with each other,correct me if I'm wronge if so then please explain me in details and links to read more on it?