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CodeNotes for Web Services in Java And . NET

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Overview

CodeNotes provides the most succinct, accurate, and speedy way for a developer to ramp up on a new technology or language. Unlike other programming books, CodeNotes drills down to the core aspects of a technology, focusing on the key elements needed in order to understand it quickly and implement it immediately. It is a unique resource for developers, filling the gap between comprehensive manuals and pocket references.

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Author Information

Bio of Gregory Brill

Gregory Brill is the series editor of CodeNotes and the founder and president of Infusion Development Corporation, a technology training and consulting firm that specializes in architecting securities trading and analytic systems for several of the world's largest investment banks. He has written for C++ Users Journal, and is the author of Applying COM+. He lives in New York.

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Additional Info

Imprint

Random House Trade Paperbacks

Filesize

2.39 MB

Number of Pages

240

eBook ISBN

9781588362544

Excerpt from: CodeNotes for Web Services in Java And . NET by Gregory Brill

Chapter 1

INTRODUCTION

What Are Web Services?

If you search the Internet, you will find an astounding variety of answers to the question "What is a web service?" The only common consensus is that web services share the following characteristics:

1. Web services use XML-based standards. As you will see in this book, web services are built on numerous APIs, standards, and protocols. Almost all of these systems use XML as a core component.

2. Web services use the Internet. In truth, most web services use standard Internet protocols, including HTTP and TCP/IP. However, web service technologies can also be deployed over messaging systems and other transport protocols.

3. Web services are platform- and language-neutral. You can build and deploy web services on almost any platform, using almost any language. Assuming you use the same version(s) of the same standard(s), a client developed in Java could easily use a web service developed in C# and hosted on Microsoft's Internet Information Services.

The next obvious question is "How can I use web services?" The answer to this question varies, depending on your specific need:

1. Linking legacy systems. If you work in a large corporation, you may want to take advantage of web services to provide cross-language and cross-platform compatibility. Why spend the time and money to rewrite your perfectly functional COBOL system in Java when you can develop a web service layer that allows your COBOL system to communicate with your new Java web portal?

2. Business to Business (B2B). The long-standing dream of simple, workable B2B communication can take a giant step forward with web services. Because web services work on open protocols, using XML you can develop B2B systems that actually work. No longer do you have to struggle with shared platforms or open large holes in your corporate firewall. Simply create straightforward web services that let your B2B partner build his own client using his own technology choices. Each side maintains control of the important pieces (technology choice, infrastructure, security, etc.), but both sides share a common, easy-to-understand set of services.