TCP/IP Sockets in Java

by Calvert; Donahoo

• ISBN13: 9780123742551
• ISBN10: 0123742552
• eBook ISBN(s): 9780123742551
• Additional ISBN(s): 9780080568782
• Edition: 2nd
• Format: Paperback
• Copyright: 2/8/2008
• Publisher: Elsevier Science

Summary

The networking capabilities of the Java platform have been extended considerably since the first edition of the book. This new edition covers version 1.5-1.7, the most current iterations, as well as making the following improvements: The API (application programming interface) reference sections in each chapter, which describe the relevant parts of each class, have been replaced with (i) a summary section that lists the classes and methods used in the code, and (ii) a ?gotchas? section that mentions nonobvious or poorly-documented aspects of the objects. In addition, the book covers several new classes and capabilities introduced in the last few revisions of the Java platform. New abstractions to be covered include NetworkInterface, InterfaceAddress, Inet4/6Address, SocketAddress/InetSocketAddress, Executor, and others; extended access to low-level network information; support for IPv6; more complete access to socket options; and scalable I/O. The example code is also modified to take advantage of new language features such as annotations, enumerations, as well as generics and implicit iterators where appropriate. Most Internet applications use sockets to implement network communication protocols. This book's focused, tutorial-based approach helps the reader master the tasks and techniques essential to virtually all client-server projects using sockets in Java. Chapter 1 provides a genral overview of networking concepts to allow readers to synchronize the concepts with terminology. Chapter 2 introduces the mechanics of simple clients and servers. Chapter 3 covers basic message construction and parsing. Chapter 4 then deals with techniques used to build more robust clients and servers. Chapter 5 (NEW) introduces the scalable interface facilities which were introduced in Java 1.5, including the buffer and channel abstractions. Chapter 6 discusses the relationship between the programming constructs and the underlying protocol implementations in more detail. Programming concepts are introduced through simple program examples accompanied by line-by-line code commentary that describes the purpose of every part of the program. The book's Web site contains many examples of command-based sockets-related code discussed throughout the book. No other resource presents so concisely or so effectively the material necessary to get up and running with Java sockets programming. KEY FEATURES * Focused, tutorial-based instruction in key sockets programming techniques allows reader to quickly come up to speed on Java applications. * Concise and up-to-date coverage of the most recent platform (1.7) for Java applications in networking technology * Provides code for all example programs via a companion Web site to let the reader see the important objects and methods in context and to understand the purpose of each line of code.

Author Biography

Kenneth L. Calvert is a professor at the University of Kentucky, where he teaches and researches computer network systems.

Table of Contents

Preface	p. xi
Introduction	p. 1
Networks, Packets, and Protocols	p. 1
About Addresses	p. 4
About Names	p. 6
Clients and Servers	p. 6
What Is a Socket?	p. 7
Exercises	p. 8
Basic Sockets	p. 9
Socket Addresses	p. 9
TCP Sockets	p. 15
TCP Client	p. 16
TCP Server	p. 21
Input and Output Streams	p. 25
UDP Sockets	p. 26
DatagramPacket	p. 27
UDP Client	p. 29
UDP Server	p. 34
Sending and Receiving with UDP Sockets	p. 36
Exercises	p. 38
Sending and Receiving Data	p. 39
Encoding Information	p. 40
Primitive Integers	p. 40
Strings and Text	p. 45
Bit-Diddling: Encoding Booleans	p. 47
Composing I/O Streams	p. 48
Framing and Parsing	p. 49
Java-Specific Encodings	p. 55
Constructing and Parsing Protocol Messages	p. 55
Text-Based Representation	p. 58
Binary Representation	p. 61
Sending and Receiving	p. 63
Wrapping Up	p. 71
Exercises	p. 71
Beyond the Basics	p. 73
Multitasking	p. 73
Java Threads	p. 74
Server Protocol	p. 76
Thread-per-Client	p. 80
Thread Pool	p. 82
System-Managed Dispatching: The executor Interface	p. 84
Blocking and Timeouts	p. 86
accept(), read(), and receive()	p. 87
Connecting and Writing	p. 87
Limiting Per-Client Time	p. 87
Multiple Recipients	p. 89
Broadcast	p. 90
Multicast	p. 90
Controlling Default Behaviors	p. 95
Keep-Alive	p. 96
Send and Receive Buffer Size	p. 96
Timeout	p. 97
Address Reuse	p. 97
Eliminating Buffering Delay	p. 98
Urgent Data	p. 98
Lingering after Close	p. 99
Broadcast Permission	p. 99
Traffic Class	p. 100
Performance-Based Protocol Selection	p. 100
Closing Connections	p. 101
Applets	p. 107
Wrapping Up	p. 107
Exercises	p. 108
Nio	p. 109
Why Do We Need This?	p. 109
Using Channels with Buffers	p. 112
Selectors	p. 115
Buffers in Detail	p. 121
Buffer Indices	p. 121
Buffer Creation	p. 122
Storing and Retrieving Data	p. 124
Preparing Buffers: clear(), flip(), and rewind()	p. 126
Compacting data in a Buffer	p. 128
Buffer Perspectives: duplicate(), slice(), etc.	p. 129
Character Coding	p. 131
Stream (TCP) Channels in Detail	p. 132
Selectors in Detail	p. 135
Registering Interest in Channels	p. 135
Selecting and Identifying Ready Channels	p. 138
Channel Attachments	p. 140
Selectors in a Nutshell	p. 140
Datagram (UDP) Channels	p. 141
Exercises	p. 145
Under the Hood	p. 147
Buffering and TCP	p. 150
Deadlock Danger	p. 152
Performance Implications	p. 155
TCP Socket Life Cycle	p. 155
Connecting	p. 156
Closing a TCP Connection	p. 160
Demultiplexing Demystified	p. 163
Exercises	p. 165
Bibliography	p. 167
Index	p. 169
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