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User interface development
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Demonstrates use of XSLT with Java servlets Compares pure J2EE user interface development with an XML approach Shows how to build multidevice and multilocale user interfaces Covers XML web publishing frameworks
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User interface development
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Creating a robust presentation layer for your J2EE application is a challenging endeavor. This is so because the vast majority of J2EE applications are webbased, also known as thin-client , applications. In this chapter, we examine some emerging challenges in J2EE user interface design and discuss ways you might use XML technology to overcome them. We begin by exploring the nature of thin-client user interface development and the challenges you are likely to face when building and maintaining an advanced presentation layer. We then examine the pure J2EE approach to building such a layer to see where the current J2EE architecture is lacking. The remainder of the chapter focuses on overcoming the limitations of the pure J2EE approach using XSLT technology. First we develop an XSLT-based presentation layer from scratch. Then we use XSLT from within a web publishing framework to discover the benefits and drawbacks of using a third party API. The goal of this chapter is not to convince you that one architecture or product is superior to another. We wish only to make you aware of the available options, see them in action, and understand the positive and negative aspects of taking each approach.
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Creating a thin-client user interface
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In this chapter, we focus almost exclusively on web-based, thin-client distributed applications. Before diving into the details of overcoming challenges associated with these types of applications, we should take a moment to discuss what they are and why building interfaces for them is so difficult.
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DEFINITION
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A thin-client application is one in which the server side is responsible for generating the user interface views into the application. The client side usually consists only of generic rendering software, e.g., a web browser.
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If you have built web-based applications before, you are no doubt familiar with the thin-client architecture. Until recently, the burden of generating the user interface for your application on the server side was not too difficult. Two relatively recent developments, however, are now making the development and maintenance of your presentation layer components more challenging.
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Creating a thin-client user interface
Serving different types of devices
The first new challenge relates to the ongoing proliferation of web-enabled devices. It seems as though anything that runs on electricity these days now has a web browser on it. These smart devices include cell phones, PDAs, and refrigerators. (That only sounds like a joke.) The trouble with these smart devices is that they are usually quite dumb, virtually light years behind the current version of your favorite computer-based Internet browser. Some understand a subset of the HTML specification, and others require an entirely separate markup language. An example of the latter is the WAP-enabled cell phone, which requires web pages to be rendered using the Wireless Markup Language (WML).
DEFINITION
WML is an XML-based presentation markup language specifically designed for web browsing on cellular telephones. These phones typically feature small display areas and very limited rendering capabilities. WML arranges content into a deck of cards (pages), each of which should contain very little data and uncomplicated navigation.
Creating a single, integrated user interface that can render content for various types of devices is difficult to do using the traditional J2EE (or ASP, or Cold Fusion, etc.) approach. User interface components in these technologies were not designed to change the entire structure of the generated content based on the type client requesting it. This means that, in order to serve web browser and cell phone client types from your J2EE web application, you must develop and maintain two separate presentation layers. One layer would generate an HTML interface, and the other a WML interface. Some updates to the application would require updates to both user interfaces. If you think managing two interfaces is scary, consider supporting three more types of client devices in the same application.
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