Head First Servlets and JSP, 2nd Edition

Here’s the architecture...

Even though this is a tiny application, we’ll build it using a simple MVC architecture. That way, when it becomes THE hottest site on the web, we’ll be ready to extend the application.

1 - The client makes a request for the form.html page.

2 - The Container retrieves the form.html page.

3 - The Container returns the page to the browser, where the user answers the questions on the form and...

4 - The browser sends the request data to the container.

5 - The Container finds the correct servlet based on the URL, and passes the request to the servlet.

6 - The servlet calls the BeerExpert for help.

7 - The expert class returns an answer, which the servlet adds to the request object.

8 - The servlet forwards the request to the JSP.

9 - The JSP gets the answer from the request object.

10 - The JSP generates a page for the Container.

11 - The container returns the page to the happy user.

Note

From here on out when you don’t see the web server, assume it’s there.