Java NIO.pdf

Java™ NIO

Ron Hitchens

Publisher: O’Reilly

First Edition August 2002

ISBN: 0-596-00288-2, 312 pages

Java NIO explores the new I/O capabilities of version 1.4 in detail and shows you how to put

these features to work to greatly improve the efficiency of the Java code you write. This

compact volume examines the typical challenges that Java programmers face with I/O and

shows you how to take advantage of the capabilities of the new I/O features. You'll learn how

to put these tools to work using examples of common, real-world I/O problems and see how

the new features have a direct impact on responsiveness, scalability, and reliability.

Because the NIO APIs supplement the I/O features of version 1.3, rather than replace them,

you'll also learn when to use new APIs and when the older 1.3 I/O APIs are better suited to

your particular application.

Table of Contents

Dedication ............................................................................................................................. 1

Preface ................................................................................................................................... 2

Organization ....................................................................................................................... 3

Who Should Read This Book............................................................................................. 5

Software and Versions ....................................................................................................... 5

Conventions Used in This Book......................................................................................... 6

How to Contact Us ............................................................................................................. 7

Acknowledgments .............................................................................................................. 8

Chapter 1. Introduction ..................................................................................................... 10

1.1 I/O Versus CPU Time ................................................................................................ 10

1.2 No Longer CPU Bound .............................................................................................. 11

1.3 Getting to the Good Stuff ........................................................................................... 12

1.4 I/O Concepts............................................................................................................... 13

1.5 Summary .................................................................................................................... 21

Chapter 2. Buffers ..............................................................................................................22

2.1 Buffer Basics .............................................................................................................. 23

2.2 Creating Buffers ......................................................................................................... 36

2.3 Duplicating Buffers .................................................................................................... 38

2.4 Byte Buffers ............................................................................................................... 40

2.5 Summary .................................................................................................................... 52

Chapter 3. Channels........................................................................................................... 54

3.1 Channel Basics ........................................................................................................... 55

3.2 Scatter/Gather............................................................................................................. 62

3.3 File Channels.............................................................................................................. 67

3.4 Memory-Mapped Files ............................................................................................... 80

3.5 Socket Channels ......................................................................................................... 91

3.6 Pipes ......................................................................................................................... 109

3.7 The Channels Utility Class....................................................................................... 114

3.8 Summary .................................................................................................................. 115

Chapter 4. Selectors ......................................................................................................... 117

4.1 Selector Basics ......................................................................................................... 117

4.2 Using Selection Keys ............................................................................................... 125

4.3 Using Selectors......................................................................................................... 128

4.4 Asynchronous Closability ........................................................................................ 137

4.5 Selection Scaling ...................................................................................................... 138

4.6 Summary .................................................................................................................. 143

Chapter 5. Regular Expressions ..................................................................................... 145

5.1 Regular Expression Basics ....................................................................................... 145

5.2 The Java Regular Expression API............................................................................ 147

5.3 Regular Expression Methods of the String Class..................................................... 168

5.4 Java Regular Expression Syntax .............................................................................. 169

5.5 An Object-Oriented File Grep.................................................................................. 172

5.6 Summary .................................................................................................................. 178

Chapter 6. Character Sets ............................................................................................... 180

6.1 Character Set Basics................................................................................................. 180

6.2 Charsets .................................................................................................................... 182

6.3 The Charset Service Provider Interface ................................................................... 201

6.4 Summary .................................................................................................................. 214

Appendix A. NIO and the JNI......................................................................................... 215

Appendix B. Selectable Channels SPI ............................................................................ 217

Appendix C. NIO Quick Reference ................................................................................ 220

C.1 Package java.nio ...................................................................................................... 220

C.2 Package java.nio.channels ....................................................................................... 227

C.3 Package java.nio.channels.spi ................................................................................. 240

C.4 Package java.nio.charset.......................................................................................... 242

C.5 Package java.nio.charset.spi .................................................................................... 246

C.6 Package java.util.regex ............................................................................................ 246

Colophon ........................................................................................................................... 250

Java NIO

Dedication

To my wife, Karen.

What would I do without you?

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