Java基础网络编程指南

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"《基础网络编程：Java实战》是一本由Esmond Pitt撰写的专著，旨在深入介绍Java在网络安全领域的基础理论与实践应用。该书作为《Java远程方法调用指南》（Addison Wesley, 2001）系列的一部分，与Kathleen McNiff共同探讨了Java网络编程的核心概念。Esmond Pitt以其丰富的经验和专业知识，为读者呈现了一本全面且实用的教程。书中涵盖了Java I/O（Input/Output）和NIO（Non-blocking Input/Output）库的深入解析，这些都是Java网络编程不可或缺的基础。I/O库用于处理应用程序与计算机硬件之间的数据交换，而NIO则提供了一种更高效、线程友好的方式来处理网络通信，特别是对于大量并发连接的场景。 Esmond Pitt利用Adobe FrameMaker、Acrobat和Distiller等工具创建了跨平台的PDF格式版本，确保了内容的可读性和兼容性。文本采用了10/11号FF Scala和Scala Sans字体，配以Lucida Sans Typewriter字体的程序代码，以保持清晰易读的排版风格。本书不仅包含了理论知识，还提供了实际案例分析和步骤指导，使得读者能够迅速掌握Java网络编程的基础技能，包括TCP/IP协议栈、Socket编程、多线程网络编程、服务器端编程、以及RMI（Remote Method Invocation，远程方法调用）技术的运用。此外，版权信息表明，除非出于研究、私人学习目的或批评与评论，否则未经许可，不得复制或商业使用该书的内容。《基础网络编程：Java实战》是Java开发人员和网络工程师的理想参考资料，无论是初学者还是进阶者，都能从中受益匪浅，提升在现代IT行业中进行网络编程的能力。"

xviii Fundamental Networking in Java

This book started life in 1993 as a 25-page paper written in collaboration with

my brother and colleague David Pitt: the paper was privately distributed to

employees and clients, and has subsequently turned up in all sorts of surprising

places.

Several anonymous reviewers contributed significantly to the final form and

content of this book. All errors however remain mine.

My thanks go to Sun Microsystems Inc. for producing Java and supplying it

free of charge, and to Sun Microsystems Ltd, Melbourne, Australia, for providing

Solaris and Linux testing facilities.

Thanks also to my long-standing colleague Neil Belford for advice, assistance,

and encouragement. Finally, thanks to Tilly Stoové and all the Pitt family for their

understanding and support during the writing of this book.

Esmond Pitt, Melbourne, June 2005.

4 Fundamental Networking in Java

fects of conditions like sigsegv on Unix platforms, or of general protec-

tion faults (GPFs) on win32 platforms: neither of these can even occur in

Java except via bugs at the jvm or jni level.

(d) Java’s extensive and well-designed class library encapsulates ip networking

perhaps an order of magnitude more simply than the Berkeley Sockets api

(the original C-language programming interface for ip), without losing any-

thing of major significance except the ability to deal with raw sockets or ip

protocols other than tcp and udp.

The Java networking classes are also

considerably simpler and more complete than any C++ networking class

library I am aware of.

The ‘new I/O’ package and the other new networking features introduced in jdk

1.4 now make Java the ideal implementation language for advanced network pro-

gramming as well, providing well-encapsulated access to non-blocking and mul-

tiplexed I/O.

1.2 Organization

Part I of the book introduces network programming and outlines some of the

special problems associated with it.

Part II introduces the ip protocol, namely the concepts of ip address, port,

and socket, and their manifestations in Java.

Part III covers the tcp protocol. Chapter 3 describes tcp client-server pro-

gramming using Java streams; Chapter 4 introduces the jdk 1.4 ‘new I/O’ pack-

age: channels and buffers; Chapter 5 describes scalable tcp programming using

‘new I/O’ channels and buffers; Chapter 6 discusses firewalls; Chapter 7 dis-

cusses secure sockets—ssl and tls; and Chapter 8 discusses scalable tls and

ssl.

Part IV covers the udp protocol. Chapter 9 describes udp peer-to-peer pro-

gramming using Java streams and DatagramPackets; Chapter 10 describes scal-

able udp programming using ‘new i/O’ channels and buffers; and Chapter 11

describes udp broadcasting and multicasting concepts and their programming

in Java in detail.

Part V covers practical matters. Chapter 12 discusses a range of scalable archi-

tectures for Java tcp servers and clients. Chapter 13 discusses numerous falla-

cies of network programming.

All sources cited are listed in the Appendices. A comprehensive glossary, a

cross-index of Java classes and methods, and a general index are provided.

1. This in turn excludes the ability to ‘ping’ at the icmp level from Java, or to discover or

manipulate ip routes.

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