Tuesday, March 1, 2011

Quick Recap: Chapters 1 to 5

Let us quickly go over the concepts we have covered in the past few chapters.

JSP & Servlet History

• ARPANET was the initial backbone based on which Internet was built
• Tim Berners Lee paved the way for the current day Internet and World Wide Web
• CGI helped people transfer data from one computer to another
• Because CGI was not scalable, people looked out for better alternatives
• JSP and Servlets became an easier and a more scalable alternative to CGI

Advantages of Using Servlets

a. They are faster than CGI scripts because each CGI script produces an entirely new process that takes a lot of time to execute, whereas a servlet creates only a new thread.
b. Servlet API is standard and available easily on the internet (like JSPs)
c. Servlets have the advantages like ease of development & platform independence (like Java)
d. They can access all the J2SE and J2EE APIs
e. Can take the full advantage & capabilities of the Java programming language

Advantages of Using JSPs

a. Write Once, Run Anywhere
b. Code Re-use
c. Support for Scripting
d. Supports Actions
e. Supports both Static & Dynamic Content
f. Supports N-tier Enterprise Application Architecture
g. Superior Quality Documentation & Examples (All over the internet)
h. Reusable Tag Libraries

Web Servers & Servlet Containers

• A web server is the server on which our J2EE application runs
• A Servlet container is similar to a JVM for java programs and executes our Servlets
• Data is transferred using the request/response model

JSP to Servlet Conversion

• A JSP file gets converted into a Servlet at run time
• The web server (Ex: Tomcat) does the conversion of the JSP
• The web server invokes the converted Servlet version of the JSP page, every time the JSP is invoked.

Previous Chapter: Chapter 5 - JSP to Servlet Conversion

Next Chapter: Self Test - Chapters 1 to 5

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