1 Introduction | Adv Java Servlet programming Tutorial |advance java tutorial

Using Java we can develop different types of application:
1) Standalone application
2) Desktop application
3) Web Application
4) Enterprise application & etc

To develop, execute and text web application we need-
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1) Web Technologies (To develop web resource programs)
Ex. Html, Servlets, JSP & etc.
2) Web Server Software (To automate the whole execution process of web application)
Ex. Tomcat, IIS etc....
3) Database software (Optional)
Ex. Oracle, Mysql, postgresql, maria db etc....
4) Browser Software's (Web clients)
Ex. Mozilla firefox, Netscape Navigator, IE, chrome etc ...
Q. What is the difference between WEB APPLICATION & WEB SITE?
- Web application that are placed on the internet network having domain name like ( ex www.techfort.com ) is called as web site.
- Web site provide 24x7 access.
- Web site allows both known & unknown clients to interact.
- Web site provide global accessibility, visibility for application data & logic.
- Web Site can be executed in LAN/ WAN etc.
(- In 1 tier/standalone/desktop applicaiton data & logic is specific to one layer.
- In 2 tier, data & logic is specific to one network or known clients only.
- If we want globalization then think about web applicaiton.)
- Once web application is placed(Hosted) on the internet network by having domain name (after purchasing sufficient amount/quantity of space to run the applicaiton) then it is called as web site.
Normal Text & Hyertext:
- Normal text allows only sequential reading (Ex. Notepad, .txt, Novels, story, ), No hyperlink.
- Hypertext contains/allows non-sequential, because of hyperlink (Ex. Webpage content)
- We use HTML to design & develop hypertext based web pages.
- Following are the two types of web pages.
1) Static Webpages.
2) Dynamic Web Pages.
To develop these web pages we need web resource programs, and web resource programs either may be
a) Static web resource program.
b) Dynamic web resource program.
- A web application is a collection of web resource program having the capacity/logic to generate webpages as a output of ur web appln.
- Static web page contains, same contents/info forever (like about us, contact us page in every web site)
- In dynamic webpages, the content of webpage will be changed based on the time of request generation or based on the values of request.
- Web resource programs generate following web pages.
1) Static web resource program generate static web pages
Ex. HTML program.
2) Dynamic web resource program generate dynamic web pages.
Ex. Servlet program, JSP program, ASP. NET program, PHP etc...
(live cricket score page, mail inbox page etc)
- image file, java script file, jquery etc can not generate web pages directly but they act as helper programs to other web resource programs.
- Web application is a collection of static, dyanamic and helper web resource programs.
To execute java application/program we need JRE and JVM.

To call Servlet program from client side we need appletviewer(with the help of applet container) or browser window.

To execute servlet program we need servlet container.

to execute JSP program we need jsp container.


web server software (like tomcat) supplies these containers along with the installation.
To develop, execution setup of application.
Here r1, r2, r3 etc are the web resource programs of a web application.

With respect to the above diagram:

1)Browser window generates the request web resource program of the web application using HTTP protocol.
2) Web server takes the request & Passes the request to appropriate web resource program of the web application.
3) 4) This web resource program will process, executes the logic of the request & generates the results. In this process/step the web resource program interacts with Database software if necessary.
5) Web resource program sends the results to web server
6) Web server sends the results to browser window as http response in the form of web page.
Note:Web application can be developed as 2 tier application (without database software) or as 3 tier application (with database software)
Based on static or dynamic content they generate, there are two types of web resource programs:
1) Static web resource program.
(all client side web pages are static w r p)
2) Dynamic web resource program.
(all server side web resource programs are dyanamic w r p).
Based on the place of where web resource program execution, there are two types of web resource programs.
1) client side web resource program.
(comes to browser window-clients from the web application of web server for execution). Ex. HTML, Javasript, css etc
2) Server side web resource program.
(Executes in web server.)
Ex. Servlet program, JSP, Asp. net, php etc
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