By Sue Spielman, Meeraj Kunnumpurath, Neil Ellis, Visit Amazon's James L. Weaver Page, search results, Learn about Author Central, James L. Weaver,

This bankruptcy has lined loads of flooring. After analyzing it, you'll have a radical figuring out of the hot positive factors on hand within the JSP 2.0 specification. We lined what you want to comprehend to put in writing your personal customized activities, despite which imple­ mentation you decide. customized activities are helpful for developing reusable JSP compo­ nents. New within the JSP 2.0 specification are the notions of tag records and JSP fragments. those are basic how one can create customized activities with no need to grasp the best way to write Java. they supply a mechanism for web page authors to create their very own customized tag libraries with out the concern of getting to write down complex Java code. utilizing tag documents presents a mechanism for disposing of writing TLD records because the JSP box gener­ ates implicit TLD documents for them. there is additionally a versatile mechanism in position for packag­ ing and deploying tag libraries in JSP 2.0. you may as well write vintage activities utilizing a number of the interfaces to be had. those comprise the subsequent: • Tag • BodyTag • IterationTag one other characteristic brought during this bankruptcy was once the recent JSP 2.0 easy Tag interface, which has a far less complicated existence cycle outlined than the vintage tag interfaces. uncomplicated Tag allows the entire strength of cooperating and generation tags with much less trouble within the coding. different new good points contain utilizing dynamic attributes in activities that let tag handlers to simply accept attributes that have not been declared in a TLD.

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4 --%> Hello World - test the J2EE SDK installation <% for (int i = 1; i < s; i++) { %> <% >Hello World> } %> When the JSP file is compiled into a servlet, that servlet code expands the JSP file's code snippets and HTML into code that writes HTML to an output stream (see listing 1-2). Listing 1-2. write("\n"); 15 Chapter 1 That code, when executed, will write the HTML code in Listing 1-3 to the stream that's sent back to the requesting browser.

Usually, some component needs to serve as a bridge between information given to the View, through the Controller, to the Model. For example, if you're submitting an input form from a Web page, sometimes the Controller will pull the values of the request out into another component that's then passed to the Model. This isn't always required, as it's possible for the Model to pull everything it needs out of the request itself. However, having a standard way to do this task sometimes is quite handy.

It's possible to use filters in any Web application that needs the functionality provided in the filter. If there's static content that's generic, you can incorporate the access to that content into a filter. Filters are defined in the web. xml file, similar to the way a servlet is defined. For example, you may define a validation filter to check if a user has a valid session. SessionValidateFilter This filter can be used to check if a user has a valid session Chapter 7 goes into the complete details of defining, building, and configuring a filter, but this should give you an idea of how useful they can be for Web application development.

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