Jabber开发者手册：探索即时通讯技术

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"Jabber Developer's Handbook" 《Jabber Developer's Handbook》是一本由Dana Moore和William Wright合著的书籍，由Sams Publishing出版，专注于介绍Jabber技术，该技术是基于XML的即时通讯（IM）协议。本书是开发者图书馆系列的一部分，旨在帮助开发者深入了解并应用Jabber技术。 Jabber是一种开放源代码的即时通讯系统，它使用了Extensible Messaging and Presence Protocol (XMPP) 协议。XMPP是一种实时通信协议，最初由Jabber社区开发，现在已经成为IETF的标准（RFC 6120）。该协议支持多种服务，包括聊天、文件传输、多用户聊天（MUC）、实时位置共享等。在《Jabber Developer's Handbook》中，读者可以期待获取以下关键知识点： 1. **XMPP协议基础**：书中会详细介绍XMPP协议的架构和工作原理，包括XML流、客户端-服务器模型、服务器-服务器通信以及如何建立和维护连接。 2. **Jabber服务器部署与配置**：学习如何设置和管理Jabber服务器，包括安装、配置、安全性和扩展性方面的考量。 3. **客户端开发**：探讨创建Jabber客户端应用的方法，包括使用各种编程语言（如Java、Python、C++等）的API和库。 4. **服务扩展**：了解如何通过XMPP实现额外功能，例如通过Jabber组件或Jabber协议扩展（XEPs）添加自定义服务。 5. **安全性与隐私**：讨论如何确保Jabber网络的安全，包括认证、加密和防止滥用策略。 6. **多用户聊天**：介绍如何建立和管理多用户聊天室，包括权限控制和管理功能。 7. **集成与API**：解释如何将Jabber集成到其他系统中，如企业级应用程序、社交媒体平台或物联网设备。 8. **实践案例与示例代码**：书中可能包含实际项目案例和示例代码，帮助开发者快速上手和理解Jabber技术的应用。 9. **最佳实践和设计模式**：作者可能会分享在开发Jabber应用时的最佳实践和常见设计模式，以提升开发效率和软件质量。 10. **故障排查与性能优化**：涵盖如何解决Jabber系统可能出现的问题，以及如何进行性能监控和调优。此书适合对即时通讯技术感兴趣的开发者，无论他们是初次接触Jabber还是寻求深入理解XMPP的资深人士。通过这本书，读者将能够掌握Jabber平台的核心概念和技术，从而能够构建自己的即时通讯解决方案。

Acknowledgments

The authors would like to thank our colleague, Rich Kilmer, the author of the Ruby

Jabber library, for introducing us to Jabber.We also thank the editors and reviewers for

their invaluable help in making this book clear, correct, and readable.

We would also like to acknowledge Dr. Mark Greaves and the DARPA Ultralog

Program for giving us a testbed for trying out ideas that materially informed both our

philosophy and technical approach.

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Introduction: Let’s Jabber

“First principles, Clarice. Simplicity. Read Marcus Aurelius. Of each particular thing, ask,‘What is

it, in itself, what is its nature…?’”

Dr. Hannibal Lecter, Silence of the Lambs

IN LOOKING AT HOW WE COULD BEST SERVE our readers, we had to decide whether to

ask you to spend your time wading through the detail of what particular messages look

like (and there are many of them) or to focus more on interesting applications. Because

the details of message formats are well-documented elsewhere (see Appendixes A and C

for resources), and because the debugger capabilities incorporated in many of the freely

available IM-style Jabber clients accurately show the XML structure of messages sent and

received, we felt that your interests as a developer would be best served if we would give

you more interesting examples with lots of working code that you could build on.

As developers ourselves, we felt that one good example is worth a thousand words

of protocol specification.That is not to say that we won’t cover message structure and

protocol—we will. However, we learned Jabber by constructing model applications and

observing how they worked, and we suspect that most other developers work this way,

too. Frankly, it’s more leverageable to learn the high-level APIs in the JabberBeans (Java)

and JabberPy (Python) libraries than to know the precise XML structure of every poten-

tial message and message type.

Jabber Enables Peer-to-Peer Computing

We will also cover the open-source Jabber server and how it works. Although Jabber

makes use of a server between clients, we tend to think of it as enabling an inherently

peer-to-peer (P2P) application model.

In truth, P2P can take many shapes, some of which have servers in the Net, and some

of which don’t. Jabber is, we maintain, very much a way to create P2P applications. In

one of the applications we show in Chapter 3, “Jabber Client Protocol,” for example, we

show you a P2P style application for photo and MP3 sharing. In Chapter 7, “Jabber and

Web Services,” we offer code that shows off Jabber’s capability to tunnel firewalls.

01 0672325365 Intro 1/21/05 2:22 PM Page 1

Introduction

With its use of Jabber Identifiers as an alternate address space, its capability to tran-

scend firewalls, and its capability to queue messages and create long-lived sessions, Jabber

is the very essence of P2P services.

In this book, we are specifically interested in presenting Jabber as a P2P protocol for

unifying the various pieces of distributed applications and providing applications that

demonstrate a preferred way to create architectural patterns such as software agents and

Web services.

Jabber Enables an Evolved System Architecture

Software paradigms tend to move much more slowly than we think.The World Wide

We b, for example, ignored the vast computing power at the end of a network connec-

tion, turning the personal computer back into a glass terminal, recapitulating for users

the ancient experience of the old 3270 style bi-synchronous terminal. Although the

implementation was worlds apart from mainframe computing, the users’ experience had

much the same feel.

When we think about systems, especially distributed systems 10, 20, 50 years hence,

we might therefore imagine that things may be very different, or not change much really.

In the last 50 years, we have evolved from single large monolithic systems to loosely

coupled architectures that are systems of systems. One genuinely new model has been

the notion of “conversational systems,” in which software modules exchange messages

with one another. Sometimes the content of these messages may be intended for human

participants and sometimes not.What we think of as program modules may start to look

like software agents, with request/response semantics transported as messages.

Therefore, it may be that conversational systems, transporting richly encoded contents

between software elements, offer the most elegant and robust mechanism for solving the

toughest programming challenge we face today: constructing robust systems of systems.

This may still be true even years from now. A single software process may contain just

enough functionality to either service requests from other processes or make requests

from other processes.

Successful software may therefore involve knitting together the capabilities of bits of

code written not as a part of some narrowly focused application but as a contributor to a

global software conversation. Every program will exist in a network fabric of other soft-

ware from which it will get significant parts of its functionality.

It is an underlying theme of this book, then, that future systems of systems will

indeed be based on a conversational, message-based transport architecture such as Jabber

because all network endpoints will look like loosely coupled, highly autonomous, dis-

tributed computational entities with conversation-like syntactic/semantic capabilities.You

will find concrete examples of computational entities engaged in conversational relation-

ships throughout the sample applications in the book.

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Jabber开发者手册：探索即时通讯技术

Sams.Jabber.Developer's.Handbook

gloox-0.9.9.3.rar_Jabber_gloox_gloox examples _gloox src_jabber

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wildfire_src_3_1_1.zip_ 即时消息_install4j_jabber server_wildfire_wi

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