Tomcat introduction

Ø  Apache Tomcat, formerly Jakarta Tomcat, which most people just call "tomcat", is an HTTP server for running Java applications. Apache tomcat is an open source web container.

Ø  Apache tomcat is a webserver and can easy to deploy our web application on server. Specially java applications.

Ø  In the Java world, they decided to create small pieces of code to serve application requests, without having to worry about how HTTP requests/responses work.

Ø  The biggest advantage in a Java-centric environment: It’s open source, lots of people know how to work with it, and you can change something that you find doesn't work for whatever reason. Other advantages: It's smaller than some other Java-based solutions. If you’re deploying Servlets, going lightweight and small is a good thing.

Ø  Tomcat uses several Java EE specifications such as Java Servlet, (JSP), EL, and WebSocket, and provides a “pure Java” HTTP web server environment for Java concept to run in.

Ø  There is a built in web container called Catalina in the tomcat bin directory. It loads all http related request and has privilege to instantiate the GET and POST method's object.

Ø  Request and Response flow of Tomcat:

It receives a HTTP request over a TCP connection. It parses it into a Request object, and calls your Servlet. Your Servlet generates all the output in a Response object. Tomcat sends this back as a HTTP response over that TCP connection.