Snell,Tidwell - Programming Web Services with SOAP (O'Reilly, 2001).pdf - Najnowsze ksiazki(26) - walbo48

Programming Web Services with SOAP

Doug Tidwell

James Snell

Pavel Kulchenko

Publisher: O'Reilly

First Edition December 2001

ISBN: 0-596-00095-2, 216 pages

Programming Web Services with SOAP introduces you to building distributed Wb-based

applications using the SOAP, WSDL, and UDI protocols. You'll learn the XML underlying

these standards, as well as how to use the popular toolkits for Java and Perl. The book also

addresses security and other enterprise issues.

Table of Contents

Preface ...........................................................

Audience for This Book ...............................................

Structure of This Book ...............................................

Conventions ......................................................

Comments and Questions ..............................................

Acknowledgments ..................................................

1. Introducing Web Services ............................................

1.1 What Is a Web Service? ............................................

1.2 Web Service Fundamentals ..........................................

1.3 The Web Service Technology Stack ...................................

1.4 Application ...................................................

1.5 The Peer Services Model ..........................................

2. Introducing SOAP ................................................

2.1 SOAP and XML ................................................

2.2 SOAP Messages ................................................

2.3 SOAP Faults ..................................................

2.4 The SOAP Message Exchange Model ..................................

2.5 Using SOAP for RPC-Style Web Services ...............................

2.6 SOAP's Data Encoding ............................................

2.7 SOAP Data Types ...............................................

2.8 SOAP Transports ...............................................

3. Writing SOAP Web Services .........................................

3.1 Web Services Anatomy 101 ........................................

3.2 Creating Web Services in Perl with SOAP::Lite ...........................

3.3 Creating Web Services in Java with Apache SOAP .........................

3.4 Creating Web Services In .NET ......................................

3.5 Interoperability Issues ............................................

4. The Publisher Web Service ..........................................

4.1 Overview .....................................................

4.2 The Publisher Operations ..........................................

4.3 The Publisher Server .............................................

4.4 The Java Shell Client .............................................

5. Describing a SOAP Service ..........................................

5.1 Describing Web Services ..........................................

5.2 Anatomy of a Service Description ....................................

5.3 Defining Data Types and Structures with XML Schemas .....................

5.4 Describing the Web Service Interface ..................................

5.5 Describing the Web Service Implementation ..............................

5.6 Understanding Messaging Patterns ....................................

6. Discovering SOAP Services ..........................................

6.1 The UDDI Registry ..............................................

6.2 The UDDI Interfaces .............................................

6.3 Using UDDI to Publish Services ....................................

6.4 Using UDDI to Locate Services .....................................

6.5 Generating UDDI from WSDL .....................................

6.6 Using UDDI and WSDL Together ...................................

6.7 The Web Service Inspection Language (WS-Inspection) .....................

101

105

106

109

111

7. Web Services in Action ............................................

7.1 The CodeShare Service Network ....................................

7.2 The Code Share Index ...........................................

7.3 Web Services Security ...........................................

7.4 Definitions and Descriptions .......................................

7.5 Implementing the CodeShare Server ..................................

7.6 Implementing the CodeShare Owner ..................................

7.7 Implementing the CodeShare Client ..................................

7.8 Seeing It in Action ..............................................

7.9 What's Missing from This Picture? ...................................

7.10 Developing CodeShare ..........................................

114

118

120

123

128

137

141

143

144

8. Web Services Security ............................................

8.1 What Is a "Secure" Web Service? ....................................

8.2 Microsoft Passport, Version 1.x and 2.x ................................

8.3 Microsoft Passport, Version 3.x .....................................

8.4 Give Me Liberty or Give Me ... .....................................

8.5 A Magic Carpet ...............................................

8.6 The Need for Standards ..........................................

8.7 XML Digital Signatures and Encryption ...............................

145

147

148

149

9. The Future of Web Services ........................................

9.1 The Future of Web Development ....................................

9.2 The Future of SOAP ............................................

9.3 The Future of WSDL ............................................

9.4 The Future of UDDI ............................................

9.5 Web Services Battlegrounds .......................................

9.6 Technologies .................................................

9.7 Web Services Rollout ............................................

151

152

155

156

158

163

A. Web Service Standardization .......................................

A.1 Packaging Protocols ............................................

A.2 Description Protocols ...........................................

A.3 Discovery Protocols ............................................

A.4 Security Protocols ..............................................

A.5 Transport Protocols .............................................

A.6 Routing and Workflow ..........................................

A.7 Programming Languages/Platforms ..................................

165

166

167

168

B. XML Schema Basics .............................................

B.1 Simple and Complex Types .......................................

B.2 Some Examples ...............................................

B.3 XML Spy ...................................................

170

172

175

C. Code Listings ..................................................

C.1 Hello World in Perl .............................................

C.2 Hello World Client in Visual Basic ..................................

C.3 Hello World over Jabber .........................................

C.4 Hello World in Java ............................................

C.5 Hello, World in C# on .NET .......................................

C.6 Publisher Service ..............................................

C.7 SAML Generation ..............................................

C.8 Codeshare ...................................................

177

178

179

181

194

207

Colophon .......................................................

221

Programming Web Services with SOAP

Preface

You'd be hard-pressed to find a buzzword hotter than web services . Breathless articles

promise that web services will revolutionize business, open new markets, and change the way

the world works. Proponents call web services "The Third-Generation Internet," putting them

on a par with email and the browseable web. And no protocol for implementing web services

has received more attention than SOAP, the Simple Object Access Protocol.

This book will give you perspective to make sense of all the hype. When you finish this book,

you will come away understanding three things: what web services are, how they are written

with SOAP, and how to use other technologies with SOAP to build web services for the

enterprise.

While this book is primarily a technical resource for software developers, its overview of the

relevant technologies, development models, standardization efforts, and architectural

fundamentals can be easily grasped by a nontechnical audience wishing to gain a better

understanding of this emerging set of new technologies.

For the technical audience, this book has several things to offer:

• A detailed walk-through of the SOAP, WSDL, UDDI, and related specifications

• Source code and commentary for sample web services

• Insights on how to address issues such as security and reliability in enterprise

environments

Web services represent a powerful new way to build software systems from distributed

components. But because many of the technologies are immature or only address parts of the

problem, it's not a simple matter to build a robust and secure web service. A web service

solution today will either dodge tricky issues like security, or will be developed using many

different technologies. We have endeavored to lay a roadmap to guide you through the many

possible technologies and give you sound advice for developing web services.

Will web services revolutionize everything? Quite possibly, but it's not likely to be as

glamorous or lucrative, or happen as quickly as the hype implies. At the most basic level, web

services are plumbing, and plumbing is never glamorous. The applications they make possible

may be significant in the future, and we discuss Microsoft Passport and Peer-to-Peer (P2P)

systems built with web services, but the plumbing that enables these systems will never be

sexy.

Part of the fundamental utility of web services is their language independence—we come

back to this again and again in the book. We show how Java, Perl, C#, and Visual Basic code

can be easily integrated using the web services architecture, and we describe the underlying

principles of the web service technologies that transcend the particular programming language

and toolkit you choose to use.

Audience for This Book

There's a shortage of good information on web services at all levels. Managers are being

bombarded with marketing hyperbole and wild promises of efficiency, riches, and new

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