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Introduction to the Web Application development |
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Gone are the days of serving static HTML pages to
the world. Now a days most website serves the dynamic pages
based on the user and their inputs.
This tutorial will take you through the
process of developing a search engine. We will use Java Servlets
to accomplish all this.
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This tutorial
assumes that you are already familiar with Web concepts such as
HTTP, browsers, and Web Servers as well as the Java programming
language.
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| What is Web
Application? |
First of all we
learn what is Web Application? Any application that uses Web
Technologies including web browsers, web servers and Internet
protocols is called Web Application.
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| A web application
can be divided into three different layers. Presentation
layer which forms the first tier of the application,
consists of web server and the web browser, which is responsible
for assembling the data into presentable format. Application
layer constitutes the second tier of the application and is
consisting of server side program and scripts. Finally the third
tier provides the programmable access to the databases. In
an e-comm scenario when a user (first tier), send a request to
the web server, web server process the request (Second and third
tier), formats the result and finally sends the formatted
results (first tier) to the client.
In this process server side scripts play a very
important role of processing the users request and in the
generation of dynamic pages, based on user and its input.
In the next section we will describe the scripts
used for generating the dynamic content. |
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