Groovyのレシピ本 - みちしるべ

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http://pragprog.com/book/sdgrvr/groovy-recipes
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Groovy Recipes: Greasing the Wheels of Java
1 Preface 12
2 Introduction 14
2.1 Groovy, the Way Java Should Be . . . . . . . . . . . . . . 16
2.2 Stripping Away the Verbosity . . . . . . . . . . . . . . . . 18
2.3 Groovy: The Blue Pill or the Red Pill? . . . . . . . . . . . 19
2.4 Road Map . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3 Getting Started 23
3.1 Installing Groovy . . . . . . . . . . . . . . . . . . . . . . . 23
3.2 Running a Groovy Script (groovy) . . . . . . . . . . . . . 26
3.3 Compiling Groovy (groovyc) . . . . . . . . . . . . . . . . . 27
3.4 Running the Groovy Shell (groovysh) . . . . . . . . . . . 28
3.5 Running the Groovy Console (groovyConsole) . . . . . . 33
3.6 Running Groovy on a Web Server (Groovlets) . . . . . . . 33
3.7 Groovy + Eclipse . . . . . . . . . . . . . . . . . . . . . . . 36
3.8 Groovy + IntelliJ IDEA . . . . . . . . . . . . . . . . . . . . 39
3.9 Groovy + TextMate . . . . . . . . . . . . . . . . . . . . . . 39
3.10 Groovy + [Insert Your IDE or Text Editor Here] . . . . . 40
4 New to Groovy 41
4.1 Automatic Imports . . . . . . . . . . . . . . . . . . . . . . 41
4.2 Optional Semicolons . . . . . . . . . . . . . . . . . . . . . 42
4.3 Optional Parentheses . . . . . . . . . . . . . . . . . . . . 44
4.4 Optional Return Statements . . . . . . . . . . . . . . . . 45
4.5 Optional Datatype Declaration (Duck Typing) . . . . . . 46
4.6 Optional Exception Handling . . . . . . . . . . . . . . . . 48
4.7 Operator Overloading . . . . . . . . . . . . . . . . . . . . 50
4.8 Safe Dereferencing (?) . . . . . . . . . . . . . . . . . . . . 51
4.9 Autoboxing . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4.10 Groovy Truth . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.11 Embedded Quotes . . . . . . . . . . . . . . . . . . . . . . 56CONTENTS 8
4.12 Heredocs (Triple Quotes) . . . . . . . . . . . . . . . . . . 56
4.13 GStrings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.14 List Shortcuts . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.15 Map shortcuts . . . . . . . . . . . . . . . . . . . . . . . . 61
4.16 Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
4.17 Closures and Blocks . . . . . . . . . . . . . . . . . . . . . 66
5 Java and Groovy Integration 69
5.1 GroovyBeans (aka POGOs) . . . . . . . . . . . . . . . . . 69
5.2 Autogenerated Getters and Setters . . . . . . . . . . . . 71
5.3 getProperty and setProperty . . . . . . . . . . . . . . . . 74
5.4 Making Attributes Read-Only . . . . . . . . . . . . . . . . 75
5.5 Constructor Shortcut Syntax . . . . . . . . . . . . . . . . 76
5.6 Optional Parameters/Default Values . . . . . . . . . . . 77
5.7 Private Methods . . . . . . . . . . . . . . . . . . . . . . . 78
5.8 Calling Groovy from Java . . . . . . . . . . . . . . . . . . 79
5.9 Calling Java from Groovy . . . . . . . . . . . . . . . . . . 81
5.10 Interfaces in Groovy and Java . . . . . . . . . . . . . . . 81
5.11 The Groovy Joint Compiler . . . . . . . . . . . . . . . . . 82
5.12 Compiling Our Project with Ant . . . . . . . . . . . . . . 84
5.13 Compiling Our Project with Maven . . . . . . . . . . . . 85
6 Groovy from the Command Line 86
6.1 Running Uncompiled Groovy Scripts . . . . . . . . . . . 86
6.2 Shebanging Groovy . . . . . . . . . . . . . . . . . . . . . 87
6.3 Accepting Command-Line Arguments . . . . . . . . . . . 88
6.4 Running a Shell Command . . . . . . . . . . . . . . . . . 89
6.5 Using Shell Wildcards in Groovy Scripts . . . . . . . . . 90
6.6 Running Multiple Shell Commands at Once . . . . . . . 91
6.7 Waiting for a Shell Command to Finish Before Continuing 91
6.8 Getting System Properties . . . . . . . . . . . . . . . . . . 92
6.9 Getting Environment Variables . . . . . . . . . . . . . . . 94
6.10 Evaluating a String . . . . . . . . . . . . . . . . . . . . . 95
6.11 Calling Another Groovy Script . . . . . . . . . . . . . . . 96
6.12 Groovy on the Fly (groovy -e) . . . . . . . . . . . . . . . . 98
6.13 Including JARs at the Command Line . . . . . . . . . . . 98
CLICK HERE to purchase this book now.CONTENTS 9
7 File Tricks 100
7.1 Listing All Files in a Directory . . . . . . . . . . . . . . . 100
7.2 Reading the Contents of a File . . . . . . . . . . . . . . . 104
7.3 Writing Text to a File . . . . . . . . . . . . . . . . . . . . . 105
7.4 Copying Files . . . . . . . . . . . . . . . . . . . . . . . . . 108
7.5 Using AntBuilder to Copy a File . . . . . . . . . . . . . . 109
7.6 Using AntBuilder to Copy a Directory . . . . . . . . . . . 110
7.7 Moving/Renaming Files . . . . . . . . . . . . . . . . . . . 112
7.8 Deleting Files . . . . . . . . . . . . . . . . . . . . . . . . . 112
7.9 Creating a ZIP File/Tarball . . . . . . . . . . . . . . . . . 113
7.10 Unzipping/Untarring Files . . . . . . . . . . . . . . . . . 114
8 Parsing XML 116
8.1 The “I’m in a Hurry” Guide to Parsing XML . . . . . . . . 116
8.2 Understanding the Difference Between XmlParser and XmlSlurper117
8.3 Parsing XML Documents . . . . . . . . . . . . . . . . . . 121
8.4 Dealing with XML Attributes . . . . . . . . . . . . . . . . 121
8.5 Getting the Body of an XML Element . . . . . . . . . . . 123
8.6 Dealing with Mixed-Case Element Names . . . . . . . . 125
8.7 Dealing with Hyphenated Element Names . . . . . . . . 125
8.8 Navigating Deeply Nested XML . . . . . . . . . . . . . . . 127
8.9 Parsing an XML Document with Namespaces . . . . . . 131
8.10 Populating a GroovyBean from XML . . . . . . . . . . . . 134
9 Writing XML 136
9.1 The “I’m in a Hurry” Guide to Creating an XML Document 136
9.2 Creating Mixed-Case Element Names . . . . . . . . . . . 137
9.3 Creating Hyphenated Element Names . . . . . . . . . . . 138
9.4 Creating Namespaced XML Using MarkupBuilder . . . . 138
9.5 Understanding the Difference Between MarkupBuilder and StreamingMarkupBuilder139
9.6 Creating Parts of the XML Document Separately . . . . 140
9.7 Creating Namespaced XML Using StreamingMarkupBuilder141
9.8 Printing Out the XML Declaration . . . . . . . . . . . . . 142
9.9 Printing Out Processing Instructions . . . . . . . . . . . 143
9.10 Printing Arbitrary Strings (Comments, CDATA) . . . . . 143
9.11 Writing StreamingMarkupBuilder Output to a File . . . 145
9.12 StreamingMarkupBuilder at a Glance . . . . . . . . . . . 145
9.13 Creating HTML on the Fly . . . . . . . . . . . . . . . . . . 145
9.14 Converting CSV to XML . . . . . . . . . . . . . . . . . . . 148
9.15 Converting JDBC ResultSets to XML . . . . . . . . . . . 151
CLICK HERE to purchase this book now.CONTENTS 10
10 Web Services 153
10.1 Finding Our Local IP Address and Name . . . . . . . . . 153
10.2 Finding a Remote IP Address and Domain Name . . . . 155
10.3 Making an HTTP GET Request . . . . . . . . . . . . . . . 156
10.4 Working with QueryStrings . . . . . . . . . . . . . . . . . 160
10.5 Making an HTTP POST Request . . . . . . . . . . . . . . 164
10.6 Making an HTTP PUT Request . . . . . . . . . . . . . . . 168
10.7 Making an HTTP DELETE Request . . . . . . . . . . . . 170
10.8 Making a RESTful Request . . . . . . . . . . . . . . . . . 171
10.9 Making a CSV Request . . . . . . . . . . . . . . . . . . . 173
10.10Making a SOAP Request . . . . . . . . . . . . . . . . . . . 173
10.11Making an XML-RPC Request . . . . . . . . . . . . . . . 175
10.12Parsing Yahoo Search Results as XML . . . . . . . . . . 177
10.13Parsing an Atom Feed . . . . . . . . . . . . . . . . . . . . 178
10.14Parsing an RSS Feed . . . . . . . . . . . . . . . . . . . . . 180
11 Metaprogramming 182
11.1 Discovering the Class . . . . . . . . . . . . . . . . . . . . 183
11.2 Discovering the Fields of a Class . . . . . . . . . . . . . . 184
11.3 Checking for the Existence of a Field . . . . . . . . . . . 186
11.4 Discovering the Methods of a Class . . . . . . . . . . . . 189
11.5 Checking for the Existence of a Method . . . . . . . . . . 191
11.6 Creating a Field Pointer . . . . . . . . . . . . . . . . . . . 193
11.7 Creating a Method Pointer . . . . . . . . . . . . . . . . . 194
11.8 Calling Methods That Don’t Exist (invokeMethod) . . . . 194
11.9 Creating an Expando . . . . . . . . . . . . . . . . . . . . 195
11.10Adding Methods to a Class Dynamically (Categories) . . 196
11.11Adding Methods to a Class Dynamically (ExpandoMetaClass) 199
12 Working with Grails 201
12.1 Installing Grails . . . . . . . . . . . . . . . . . . . . . . . 201
12.2 Creating Your First Grails App . . . . . . . . . . . . . . . 205
12.3 Understanding Grails Environments . . . . . . . . . . . 213
12.4 Running Grails on a Different Port . . . . . . . . . . . . 214
12.5 Generating a WAR . . . . . . . . . . . . . . . . . . . . . . 215
12.6 Changing Databases . . . . . . . . . . . . . . . . . . . . . 215
12.7 Changing the Home Page . . . . . . . . . . . . . . . . . . 219
12.8 Understanding Controllers and Views . . . . . . . . . . . 220
12.9 Dynamic Scaffolding . . . . . . . . . . . . . . . . . . . . . 222
12.10Validating Our Data . . . . . . . . . . . . . . . . . . . . . 224
12.11Managing Table Relationships . . . . . . . . . . . . . . . 228
CLICK HERE to purchase this book now.CONTENTS 11
12.12Mapping Classes to Legacy Databases . . . . . . . . . . 232
13 Grails and Web Services 234
13.1 Returning XML . . . . . . . . . . . . . . . . . . . . . . . . 234
13.2 Returning JSON . . . . . . . . . . . . . . . . . . . . . . . 236
13.3 Returning an Excel Spreadsheet . . . . . . . . . . . . . . 238
13.4 Setting Up an Atom Feed . . . . . . . . . . . . . . . . . . 240
13.5 Setting Up an RSS Feed for Podcasts . . . . . . . . . . . 244
13.6 Installing Plug-Ins . . . . . . . . . . . . . . . . . . . . . . 248
Index 249
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