Introduction Of JSP
JSP technology is used to create web application
just like Servlet technology. It can be thought of as an extension to Servlet
because it provides more functionality than servlet such as expression
language, JSTL, etc.
A
JSP page consists of HTML tags and JSP tags. The JSP pages are easier to
maintain than Servlet because we can separate designing and development. It
provides some additional features such as Expression Language, Custom Tags,
etc.
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Fig: Introduction Of JSP |
Advantages of JSP over Servlet
There
are many advantages of JSP over the Servlet. They are as follows:
1) Extension to Servlet
JSP
technology is the extension to Servlet technology. We can use all the features
of the Servlet in JSP. In addition to, we can use implicit objects, predefined
tags, expression language and Custom tags in JSP, that makes JSP development
easy.
JSP
technology is the extension to Servlet technology. We can use all the features
of the Servlet in JSP. In addition to, we can use implicit objects, predefined
tags, expression language and Custom tags in JSP, that makes JSP development
easy.
2)
Easy to maintain
JSP
can be easily managed because we can easily separate our business logic with
presentation logic. In Servlet technology, we mix our business logic with the
presentation logic.
JSP
can be easily managed because we can easily separate our business logic with
presentation logic. In Servlet technology, we mix our business logic with the
presentation logic.
3)
Fast Development: No need to recompile and redeploy
If
JSP page is modified, we don't need to recompile and redeploy the project. The
Servlet code needs to be updated and recompiled if we have to change the look
and feel of the application.
If
JSP page is modified, we don't need to recompile and redeploy the project. The
Servlet code needs to be updated and recompiled if we have to change the look
and feel of the application.
4)
Less code than Servlet
In
JSP, we can use many tags such as action tags, JSTL, custom tags, etc. that
reduces the code. Moreover, we can use EL, implicit objects, etc.
Creating
a simple JSP Page
To
create the first JSP page, write some HTML code as given below, and save it by
.jsp extension. We have saved this file as index.jsp. Put it in a folder and
paste the folder in the web-apps directory in apache tomcat to run the JSP page.
index.jsp
The
simple example of JSP where we are using the scriptlet tag to put Java code in
the JSP page. We will learn scriptlet tag later.
How to run a simple JSP
Page?
Follow
the following steps to execute this JSP page:
- Start
the server
- Put
the JSP file in a folder and deploy on the server
- Visit the browser by the URL http://localhost:portno/contextRoot/jspfile, for
example, http://localhost:8888/myapplication/index.jsp
In
JSP, we can use many tags such as action tags, JSTL, custom tags, etc. that
reduces the code. Moreover, we can use EL, implicit objects, etc.
Creating a simple JSP Page
To
create the first JSP page, write some HTML code as given below, and save it by
.jsp extension. We have saved this file as index.jsp. Put it in a folder and
paste the folder in the web-apps directory in apache tomcat to run the JSP page.
index.jsp
The
simple example of JSP where we are using the scriptlet tag to put Java code in
the JSP page. We will learn scriptlet tag later.
<html>
<body>
<% out.print(2*5); %>
</body>
</html>
How to run a simple JSP Page?
Follow
the following steps to execute this JSP page:
- Start
the server
- Put
the JSP file in a folder and deploy on the server
- Visit the browser by the URL http://localhost:portno/contextRoot/jspfile, for
example, http://localhost:8888/myapplication/index.jsp
Hello, my name is Pramod Dwivedi. I'm a 5 year old self-employed in online business Industry.
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