Quick Recap: Chapters 6 to 19

Let us quickly go through what we learnt in the previous chapters…

Request Handling Basics:

• The HTTP methods GET, POST, and PUT are how browsers and Web servers trade data with each other
• The GET retrieves a page without providing much information, while a POST can package huge amounts of information with its request
• The most important objects in the servlet process are the request and response objects
• The request parameters for the servlet are the strings sent by the client to the Servlet Container. The container parses the request and puts the information in a HttpServletRequest object which is passed to the servlet
• The container wraps the response parameters with the HttpServletResponse object which is passed back to the container

Scope:

• When something has Context scope it is application-wide and all users can share data
• Session scope means one user can share data across page views, but other users can't
• Request scope restricts data to only that page


Servlet Lifecycle:

• The init() method is used to initialize the Servlet
• The service() methods (doGet(), doPost() etc) get invoked everytime a user request gets submitted
• The destroy() method is used to kill/invalidate the Servlet once it is no longer required.


Key Terms we Learnt:

The key terms we learnt and understood in these chapters were:

1. Redirection
2. Servlet Life-Cycle
3. Servlet Forwarding and Includes
4. Servlet attribute
5. Context parameters
6. Application session
7. listeners

Previous Chapter: Chapter 19 - Listeners & Interfaces in the Web Context

Next Chapter: Self Test - Chapters 6 to 19