Web Application Development with Java Server Pages (JSP)
JSP technology speeds the development of dynamic web pages in a number of ways:
* Separating content generation from presentation
Using JSP technology, web page developers use HTML or XML tags to design and format the results page. They use JSP tags or scriptlets to generate the dynamic content (the content that changes according to the request, such as requested account information or the price of a specific bottle of wine). The logic that generates the content is encapsulated in tags and JavaBeans components and tied together in scriptlets, all of which are executed on the server side. If the core logic is encapsulated in tags and beans, then other individuals, such as web masters and page designers, can edit the JSP page without affecting the generation of the content.
On the server, a JSP engine interprets JSP tags and scriptlets, generates content (for example, by accessing JavaBeans components, accessing a database with JDBCTM technology, or including files), and sends the results back in the form of an HTML (or XML) page to the browser. This helps authors protect proprietary code while ensuring complete portability for any HTML-based web browser.
* Emphasizing reusable components
Most JSP pages rely on reusable, cross-platform components (JavaBeans or Enterprise JavaBeansTM components) to perform the more complex processing required of the application. Developers can share and exchange components that perform common operations, or make them available to larger user or customer communities. The component-based approach speeds overall development and lets organizations leverage their existing expertise and development efforts for optimal results.
* Simplifying page development with tags
Web page developers are not always programmers familiar with scripting languages. The JavaServer Pages technology encapsulates much of the functionality required for dynamic content generation in easy-to-use, JSP-specific XML tags. Standard JSP tags can access and instantiate JavaBeans components, set or retrieve bean attributes, download applets, and perform other functions that are otherwise more difficult and time-consuming to code.
The JSP technology is extensible through the development of customized tag libraries. Over time, third-party developers and others will create their own tag libraries for common functions. This lets web page developers work with familiar tools and constructs, such as tags, to perform sophisticated functions.
// By Ricky
