WAP Servlets: Developing Dynamic Web Content with Java and WML (Professional Developer's Guide Series) - Softcover

Über die Autorin bzw. den Autor

JOHN L. COOK III is a Senior Architect, responsible for R&D of emerging wireless client/server technology at Cerulean Technology, an Aether company, a leading provider of wireless solutions. His company?s representative to the high-profile WAP Forum, Cook is also the inventor and patent holder for five networking/wireless technologies.

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Get ready for the next wave Internet and learn to create Java servlets for handheld WAP browsers

To join the wireless Internet revolution, programmers will need to write Web applications for the #1 wireless standard, the Wireless Application Protocol (WAP). Bringing together the two technologies essential for modern WAP development--servlets and WML (Wireless Markup Language)--this powerful book/CD package gives you a complete set of tools for creating Java servlets for WAP browsers.

Expert John Cook guides you through all the necessary steps and code examples, demonstrating in detail how Sun Microsystems Java Servlet Development Kit (JSDK) and WML can be used to develop dynamic Web content for a variety of handheld devices.

With an emphasis on features and techniques useful to the WAP servlet developer, Cook provides:
* An introduction to WAP software architecture
* Step-by-step WML, including examples, screenshots, and how to build a WML home page
* The most useful methods of JSDK classes/interfaces plus a real-world example of a WAP servlet
* An overview of WAP push technology, including the Push Access Protocol (PAP)
* How to acquire, install, and setup the various development environments and phone SDKs
* Appendices covering WML 1.2 and JSDK 2.1.1, and how to implement servlet engines on HTTP servers

The CD-ROM contains the JSDK, Phone.Com's SDK, Nokia's SDK, and other useful public domain software.

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Wap Servlets : Developing Dynamic Web Content with Java and WML By Cook III, John L.

Chapter 1: Introduction

The Internet has changed the way individuals work, play, and live. The advent of the Internet is the single most important happening in computing history and has changed the desktop computer from a business-productivity tool to a household appliance. The ultimate impact that the Internet will have on humanity is just beginning to unfold. In the early stages of this revolution in technology, a relatively new twist is beginning to have its own profound influence: the wireless Internet. The primary vehicle for the transition from wired to wireless Internet is the hand-held browser, and the developer's key to unlocking its mysteries is the WAP Servlet.

Why Develop for the WAP Browser?

Perhaps the first question that you should ask is, "Why develop for the wireless Internet?" After all, Internet companies are coming out with unbelievable evaluations, and these companies do not necessarily have anything to do with wireless technologies. Furthermore, many of these companies do not even have a wireless strategy. Developers would certainly not be making a mistake by focusing on traditional wired networking.

h1 order to see why the wireless Internet is an equally intriguing choice, you should consider two areas. First, how has the wired Internet impacted society? Second, how does wireless technology augment and improve the wired Internet? By examining these topics, you should see that wireless technology will have a profound effect on how people use the Internet in the future.

So how exactly has the wired Internet impacted humanity? You might begin to answer this question by reviewing your own online shopping habits over the last few years.

Online shopping (or e-commerce, as it is commonly known) has many advantages to the consumer: no travel time, more product information, better prices, and delivery in the case of gift shopping. Besides the advantages to consumers, retailers also gain benefits from e-commerce: a new channel, reduction in sales staff, and lower facility costs.

The Internet has also improved individuals' abilities to communicate. Workers can choose from many technologies that improve their ability to communicate with co-workers, customers, and partners: e-mail, conferencing, Web sites, and online tools. Virtual private networking has enabled individuals to participate in their corporate networks regardless of their location. Web-based communications services have enabled people to access their e-mail and voice mail from virtually anywhere on the planet. Additionally, you cannot forget the roots of the Web in its ability to convey information. Using this unique aspect of the Internet, corporations and individuals have the ability to make information known to every Internet user in a matter of moments.

Besides its utility for e-commerce and business at large, the Internet has rapidly moved into the realm of entertainment. The Internet has extended the value of existing media (such as radio, television, periodicals, and books) by supporting its content with online supplements. New Web-based streaming audio and video programs are on the market. Both individual and multi-player games are available for the entertainment of Internet users. With all that the Internet has brought to humanity, it does have one fundamental limitation, however: portability. In order words, e-mail, e-commerce, gaming, streaming video, surfing, and so on all require sitting at a desktop system-either at home or at the office. The ability to connect a laptop via a cellular phone or wireless modem has greatly improved portable access to the Internet; however, there are many situations when a wireless laptop is inconvenient or unavailable. Furthermore, when moving from location to location, you tend to turn off these devices and pack them in cases that are not convenient to carry in many situations.

New wireless hand-top and palm-top devices (such as the Palm OS and Windows-CE devices that have been wirelessly enabled) have been introduced in recent years. While these devices improve the ability to be connected while away from the desktop, they are unable to provide the same level of experience that users have come to expect from the Internet. Users are beginning to realize, however, that the goal of the wireless Internet is to augment the wired Internet, not to replace it. Technology has extended the reach of the Internet past the wire. The Wireless Application Protocol (WAP) standards define the framework for connecting a WAP browser to the Internet. The WAP browser is a software application that is suitable for implementation in common hand-held wireless devices: cellular phones, two-way pagers, and personal information managers. Unlike a laptop or palm-top that uses standard Internet protocols over a wireless modem, the WAP architecture was designed to support rather than replace the wired Internet. Because the WAP browser runs on devices that are designed to be carried about and operated around the clock, WAP leads to an important evolution in Internet usage: 24-hours-a-day, seven-days-a-week connectivity.

Full time connectivity to the Internet means that you can stay connected with your desktop e-mail, contact list, and calendar...