This document provides an overview of Java web programming concepts. It discusses how web servers, servlets, and browsers communicate using HTTP and HTTPS. Servlets act as controllers that can read requests, call model classes to retrieve data, and write responses that include view content like HTML. JSPs allow generating dynamic HTML content by separating code and content into different files for easier maintenance of pages that frequently change. The document demonstrates a simple "Hello World" example using a servlet to generate output in the browser.

1. Java Web Programming
Week 1

7. what is web programming?

8. Why Can’t We Have a Simple Java
Main Class?
How do I How do you How do the world
talk to a class? talk to a class? talk to a class?

9. YEAH I KNOW THAT! THAT’S HTTP, XML,
(X)HTML(5), WS .. ALL THOSE RUBBISH!
BUT..
Source:http://onjava.com

10. Some Movie Stars’ Names For Rest Of
Your Life To Dream On!
Web Server/Servlet Container/Application
Server
HTTP/HTTPS : All of em’ understand these guys!
GET/POST .. again?
Browser : a genius!

11. Web/Application Servers
http://www.yarlithub.org:8080/yschool/crash/oops.html
Apache
IIS
Websphere
weblogic
Jetti! Netti

12. Model View Controller

13. Bite on JSP/Servlet
+ Servlet is your controller!
+ Container understand which request is for which
servlet!
+ Servlet can read the request, “call the friend” if doesn’t
know the answer! Then write the response.
+ That friend can be a “Model” Or a “Service”!
+ What is written in the response is the “VIEW” .. HTML
Servlet is the controller, response is the view & person who
knows the answer is the model!

14. Sample Servlet
Source : http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/Servlet-Tutorial-First-Servlets.html

15. Result in Browser
http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/Servlet-Tutorial-First-Servlets.html

16. Wait A Sec .. Where is this damn JSP?
We should have
– THINK
written the html
content into a file!
If files vary then its
fine! … But if the
content vary?

17. An ultimate web application!

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