By Larne Pekowsky
This ebook teaches newbie programmers how one can create dynamic websites with JavaServer Pages (JSP) utilizing many examples. This tutorial/reference brings JavaServer Pages to the large viewers of non-programmers and permits them to get the main productiveness from JSPs, with the least attempt. This moment variation covers the most recent liberate of the JSP specification (2.0), together with overviews of a few similar applied sciences resembling servlets, the Java common tag library (JSTL), Jakarta Struts, and databases. the second one version of this bestseller incorporates a variety of commonplace extensions to JSPs, in addition to a few top practices which were constructed because the first version used to be written.Over the prior few years, JavaServer Pages became a well-liked and significant know-how for construction dynamic websites. numerous advertisement implementations, in addition to time-honored open-source ones, exist already and are in vast use. not like Microsoft's lively Server Pages, JSPs don't tie the developer to any specific platform, and come to builders without charge.
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Extra info for JavaServer Pages, Second Edition
A simple mechanism allows JSP authors to specify any of several lifetimes for their beans. These lifetimes are called scopes, and they indicate the period of activity during which the bean is available. If a bean is created and placed in a scope, any changes to that bean made via jsp:setProperty tags will be visible to other pages using the same bean. A scope may be given to a bean by adding scope= to the jsp:useBean tag:
By supporting serialization, beans also help pull changeable data out of pages, which allows a bean to be customized and stored. This customization can tailor a bean for a site or a period of time. Chapter 10 discusses how to write beans in more detail. In the meantime, the source code for all the beans used in this chapter is included on the CD-ROM for interested readers to explore. In order to complete the calculator and quiz examples from this chapter, a page must be able to customize itself based on certain criteria.
The tag used this time is called awl:maybeShow, and it has a parameter, show, that controls what the tag should do with its body. This parameter may be set to no, in which case the body is hidden from the page; yes, in which case the body is displayed; or reverse, in which case the body is shown backward. Note that the body of the awl:maybeShow tag may include anything, including other JSP tags. This was also true of the jsp:useBean tag and in fact is true of any custom tag that has been properly programmed.