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<big>J</big>AVA<big>S</big>ERVER <big>P</big>AGES<SUP><small>TM</small></SUP><BR>
A Simplified Guide
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<b class="heading">1. Executive Summary</b></td>
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<p>The Internet was once full of Web sites hosting static pages ("brochure-ware") or simple
forms at best. Now it's an interactive environment for transacting daily business, from
shopping to trading stocks to interacting with suppliers, in a personalized and dynamic
setting. Today, the tools and products to build dynamic, Web-based applications are
still maturing. Traditionally, companies used CGI applications to generate dynamic
content for Web pages. But that solution hasn't scaled well to support complex
functionality and growing numbers of concurrent users. JavaServer Pages
<SUP><small>TM</small></SUP> (JSP<SUP><small>TM</small></SUP>) technology provides a
highly scalable method for creating dynamic content for the Web. As part of the
Java<SUP><small>TM</small></SUP> family of APIs, JSP technology shares the Write Once,
Run Anywhere<SUP><small>TM</small></SUP> benefits of the Java platform, with easy access
to a broad range of Java APIs. JSP technology enables a tiered development methodology
that lets organizations leverage internal programming expertise to create applications
that are fast to deploy and easy to maintain.</P>
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<b class="heading">2. Multitier Application Architectures</b></td>
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<P>The growth and acceptance of the Internet in both businesses and homes is changing the
face of many industries - and the information systems that support them. From new .com
companies to brick-and-mortar establishments, businesses everywhere are finding new ways
to leverage the power of the Internet. Software developers have been quick to realize
the possibilities of Web-based clients in application architectures. With a browser on
virtually every desktop, companies can deploy a multitier architecture in which Web
servers act as a middle tier, managing interactions with Web-based clients.</P>
<P>A Web-based client architecture may have three or more layers. This multitier architecture
provides many benefits over a traditional (two-tiered) client/server architecture.</P>
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<LI>Installing and deploying the user interface is virtually instantaneous - only the Web
interface in the middle tier needs to be updated.</LI>
<LI>Because the application itself is server-based, users always access the most
up-to-date version.</LI>
<LI>Without a "thick" client interface, it is easier to deploy, maintain, and modify
applications - no matter where the client is located.</LI>
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<P>These benefits explain the growing popularity of the multitier architecture, and why
almost every client/server application provider has retooled or is retooling to support
Web-based clients.</P>
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<h4>Development Tools and Methodologies Are Maturing</h4>
<P>Companies building and deploying applications on this model are faced with an application
environment that is still maturing. A number of different technologies - ranging from
traditional CGI scripts to JSP technology - are available today to build the interactive,
"customer-facing" component of these applications. The challenge is selecting an
application architecture and component design that meets the evolving user needs (whether
they be customers, partners, or internal staff) as well as the enterprise's own IT
requirements.</P>
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<h4>Users Have Heightened Requirements</h4>
<P>Internet users have heightened expectations for application availability and reliability.
They want to be able to access applications at any time of day or night to perform a
wide variety of tasks online. They expect up-to-date information and fast response
times.</P>
<P>To support these requirements, application providers need high-performance, highly
reliable applications that can be updated easily. They need applications that can scale
to support large numbers of users, and that can interact with vital business systems.</P>
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<h4>Solutions Must Meet Demanding Enterprise Software Requirements</h4>
<P>The organizations that are building and maintaining these applications also have
stringent requirements when selecting the architectures, products, and tools for creating
Web-based applications.</P>
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<LI>The development platform must support fast application deployment and rapid updates.</LI>
<LI>The application must be easy to maintain using minimal developer resources. Many
organizations face a shortage of qualified Web developers and need to protect the
developers they already have.</LI>
<LI>Finally, the organization needs to retain the ability to adopt new tools or technologies
as needed, so the development environment should not close out options. With new tools,
systems, and information sources appearing nearly everyday, there is a risk to selecting
a solution that leaves the organization entirely at the mercy of a single vendor - even
if that vendor is the market leader.</LI>
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Web Page Made By : <i><a href="mailto:chengchien@linkline.com">Cheng-chien Yu</a></i><br>
Attaendant Class : Santa Monica College - CIS 36H<br>
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