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JavaServer Pages Overview
JavaServer Pages (JSP) technology enables Web developers and designers to rapidly
develop and easily maintain, information-rich, dynamic Web pages that leverage
existing business systems. As part of the Java technology family, JSP technology
enables rapid development of Web-based applications that are platform independent.
JSP technology separates the user interface from content generation, enabling
designers to change the overall page layout without altering the underlying dynamic
content.
Benefits for Developers
If you are a Web page developer or designer who is familiar with HTML, you can:
Use JSP technology without having to learn the Java language: You can use JSP
technology without learning how to write Java scriplets. Although scriptlets are
no longer required to generate dynamic content, they are still supported to provide
backward compatibility.
Extend the JSP language: Java tag library developers and designers can extend the
JSP language with "simple tag handlers," which utilize a new, much simpler and
cleaner, tag extension API. This spurs the growing number of pluggable, reusable
tag libraries available, which in turn reduces the amount of code needed to write
powerful Web applications.
Easily write and maintain pages: The JavaServer Pages Standard Tag Library (JSTL)
expression language is now integrated into JSP technology and has been upgraded to
support functions. The expression language can now be used instead of scriptlet
expressions.
JSP Technology and Java Servlets
JSP technology uses XML-like tags that encapsulate the logic that generates the
content for the page. The application logic can reside in server-based resources
(such as JavaBeans component architecture) that the page accesses with these tags.
Any and all formatting (HTML or XML) tags are passed directly back to the response
page. By separating the page logic from its design and display and supporting a
reusable component-based design, JSP technology makes it faster and easier than ever
to build Web-based applications.
JavaServer Pages technology is an extension of the Java Servlet technology.
Servlets are platform-independent, server-side modules that fit seamlessly into a
Web server framework and can be used to extend the capabilities of a Web server with
minimal overhead, maintenance, and support. Unlike other scripting languages,
servlets involve no platform-specific consideration or modifications; they are
application components that are downloaded, on demand, to the part of the system
that needs them. Together, JSP technology and servlets provide an attractive
alternative to other types of dynamic Web scripting/programming by offering:
platform independence; enhanced performance; separation of logic from display; ease
of administration; extensibility into the enterprise; and, most importantly, ease
of use.
Today servlets are a popular choice for building interactive Web applications.
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