June 2004
Intermediate to advanced
480 pages
14h 30m
English
Content preview from Programming Jakarta Struts, Second Edition
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JavaServer Pages
The first thing to understand about JavaServer Pages is that it’s a natural extension to the Java Servlet technology. In fact, after some preprocessing by a translator, JSP pages end up being nothing more than Java servlets. This is a point that many beginning developers have a hard time understanding. JSP pages are text documents that have a .jsp extension and contain a combination of static HTML and XML-like tags and scriptlets. The tags and scriptlets encapsulate the logic that generates the content for the pages. The .jsp files are preprocessed and turned into .java files. At this point, a Java compiler compiles the source and creates a .class file that can be executed by a servlet container.
The translator that turns the .jsp file into a .java file takes care of the tedious work of creating a Java servlet from the JSP page. Figure 1-2 illustrates how a JSP page is translated and compiled into a servlet.
Figure 1-2. A JSP page is translated and compiled into a Java servlet
JSP technology has become an extremely popular solution for building web applications using the Java platform. JSP offers several advantages over its competitors:
JSP is a specification, not a product. Developers are able to choose a “best of breed” approach.
JSP pages are compiled, not interpreted, which can lead to better performance.
JSP pages support both scripting and access to the full Java ...
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