Dynamic web pages in java

Dynamic Web Pages In Java: How To
Create Web Pages In Java?

Website
 Website is a collection of related web pages that
may contain text, images, audio and video. The
first page of a website is called home page. Each
website has specific internet address (URL) that
you need to enter in your browser to access a
website.
 Website is hosted on one or more servers and
can be accessed by visiting its homepage using a
computer network. A website is managed by its
owner that can be an individual, company or an
organization

Static website
 Static website is the basic type of website that is
easy to create. You don't need the knowledge of web
programming and database design to create a static
website. Its web pages are coded in HTML.
 The codes are fixed for each page so the information
contained in the page does not change and it looks
like a printed page.

Dynamic website
 Dynamic website is a collection of dynamic web pages whose
content changes dynamically. It accesses content from a
database or Content Management System (CMS). Therefore,
when you alter or update the content of the database, the
content of the website is also altered or updated.
 Dynamic website uses client-side scripting or server-side
scripting, or both to generate dynamic content.
 Client side scripting generates content at the client computer
on the basis of user input. The web browser downloads the
web page from the server and processes the code within the
page to render information to the user.
 In server side scripting, the software runs on the server and
processing is completed in the server then plain pages are
sent to the user.

Static vs Dynamic website
Static Website Dynamic Website
Prebuilt content is same every time the page
is loaded.
Content is generated quickly and changes
regularly.
It uses the HTML code for developing a
website.
It uses the server side languages such
as PHP,SERVLET, JSP, and ASP.NET etc.
for developing a website.
It sends exactly the same response for every
request.
It may generate different HTML for each of
the request.
The content is only changed when someone
publishes and updates the file (sends it to the
web server).
The page contains "server-side" code which
allows the server to generate the unique
content when the page is loaded.
Flexibility is the main advantage of static
website.
Content Management System (CMS) is the
main advantage of dynamic website.

Dynamic Web Pages
 Dynamic web pages are server-side web pages, each
time it is viewed, we see different content.It is controlled
by Application server processing server-side scripts. The
dynamic web pages can also change their contents on
the request of the client. They have the capability to
generate new content according to time and need. Which
simply means that dynamic web pages are never the
same for all users.
 We all are well aware of the need for dynamic web pages
in day to day life.
 The best example of a dynamic web page we always see
is captcha.
 The main difference between static and dynamic web
pages is that static web page remains the same for all
clients or users while dynamic web page changes itself
according to the time and as per the user’s request.

Servlets
 In Java, a servlet is a way to create those
dynamic web pages. Servlets are nothing but the
java programs. In Java, a servlet is a type of java
class which runs on JVM(java virtual machine) on
the server side. Java servlets works on server
side.Java servlets are able to handle large and
complex problems and requests by users.
 Let us move further with dynamic web pages in
java

What is a web server?
 A web server is used to transfer data in the form
of the HTTP protocol. The client just has to type
the URL in a browser and the web server
provides her/him the required web page to read.
So, how it works..? What a web server does
inside?
 The web server converts the client typed URL into
the HTTP protocol in order to respond to the
request and with the help of Servlets, it serves
the client’s request.

Properties of servlets
 Servlets work on server side extensions to handle
the complex problems.
 Servlets covers all the limitations of CGI.

What is CGI?
 CGI (common gateway interface), is an application
which is used to produce dynamic contents of web
pages. Common gateway interface can be created by
using any programming language like c,c++, etc.
 While using CGI, when client request anything, the
web server performs the following tasks sequentially:-
 It receives the request and the required CGI.
 It generates a new process and calls the required CGI
application.
 CGI generates the output and after getting the
information of the request made by the client.
 It sends the output(response) to the web server and
destroys the process.
 Web server displays it on client’s screen.

Servlets are cheaper than CGI and are capable to handle cookies.
The java servlet follows a simple process, showing by the below
block diagram:-
Steps
 A client sends the request to a web server.
 The web server receives the request from client.
 Servlets receives the request.
 Servlets process the request and produce the
output.
 Servlet sends the output to the web server.
 A web server sends it to the client’s browser and
browser display it on the client’s screen.
 There are two packages by which servlets can build
javax.servlet(Basic)
javax.servlet.http(Advance)

Advantages of Servlets
 They are platform independent.
 They are cheaper than CGI.
 They are capable to handle cookies.
 They overcome the limitations of CGI.
 NO need to create new process for any request.
 As it is server-side application, it can inherit the
security from a web server.

What is servlet container
 Users did not have the facility to request and
access the static pages but dynamic also, where
dynamic web pages can work differently each
time for different inputs and according to the time.
 A servlet container is nothing but a concept or
idea to use them

Dynamic web pages in java

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