Grails 1.1. Web Application. Development. Reclaiming Productivity for Faster. Java Web Development. Jon Dickinson PUBLISHING J MUMBAI BIRMINGHAM

Transcription

1 Grails 1.1 Development Web Application Reclaiming Productivity for Faster Java Web Development Jon Dickinson PUBLISHING J BIRMINGHAM - MUMBAI

2 Preface Chapter 1: Getting Started with Grails 7 Why Grails? 7 Less configuration 8 Faster setup 8 Shorter develop/test cycle 9 Consistent development environment 9 Domain-specific language for web development 10 Fewer dependencies 10 Installing Grails 11 Build a team communication portal 14 Summary 15 Chapter 2: Managing Users with Scaffolding 17 What is scaffolding? 17 Create the domain classes 18 Create the User domain class 19 Create the Role domain class 20 Creating controllers to enable scaffolding 21 Control through constraints 25 Meeting the relations 29 Relating roles and users 29 Ordering fields through constraints 31 Bootstrapping demo data 31 Summary 33 Chapter 3: Posting Messages 35 Message domain class 36 Rendering a form 37 Message controller 37 1_

3 Tabic of Contents Groovy Server Pages Create message view Grails layouts Show the form Handling user input Binding the request to the domain Validate and save Flash scope Redirect Render validation errors Feedback to the user Create a home page HomeController List all messages Home page view Styles and navigation Set the default page Update the layout Tidying up HTML encoding Overriding validation error messages Summary Chapter 4: Introduction to Groovy What is Groovy? 59 Object-Oriented 60 Dynamic 60 Functional 61 Loosely typed and strongly typed 61 Why Groovy? 62 Familiar syntax 62 Direct integration with Java 62 Running Groovy 63 Installing Groovy 63 Groovy shell 65 Groovy console 66 Execute Groovy scripts 66 Groovy classes and scripts 67 Groovy Features 68 Semicolons 68 Strings 69 Numbers

4 Lists 72 Maps 74 Ranges 75 Truth and equality 76 Closures Plain old Groovy objects 78 Metaprogramming 79 Adding dynamic behavior 80 The great pretender 80 Builders 81 Summary 83 Chapter 5: Authentication with JSecurity Plug-in 85 Where to find plug-ins 86 Installing a plug-in 86 Configuring JSecurity plug-in 88 How does JSecurity work? 88 More about realms Create a simple realm 90 Implement authenticate 91 Dynamic finders 92 Implement hasrole 94 Install the authentication controller 94 The authentication filter Password encryption 97 Add the missing pieces 99 Encryption of users' passwords 99 Permission denied page 101 Sign out link 103 Who posted that? 105 Relate messages to users 106 Making it happen 107 Showing the user 108 Hibernate lazy loading 109 Eager load users 110 Summary 111 Chapter 6: Testing 113 Writing unit tests 114 Why we write unit tests 114 Confidence in code 114 Improve design 114 Developer productivity 114 Document code

5 How to write unit tests 115 Test discreet units of code Trust your libraries 115 Test your production code 116 Descriptive test names 116 Test one thing at a time 117 JUnit refresher 117 SetUp and TearDown 118 Asserting expectations 118 Unit tests in Grails 119 Groovy test extensions 119 Create a grails test 121 Running our tests 121 Grails testing plug-in 122 Testing Metacontroller 123 Testing validation 127 Limitations of Grails in unit tests 128 Integration testing 128 External dependencies 129 Repeatable tests 129 Integration tests in Grails 129 Bootstrap for environments 130 Functional testing 132 Environment setup 132 Repeatable tests 133 Test performance 133 Fragility of tests 133 Making tests understandable 133 Functional testing In Grails 134 Benefits of functional testing in Grails 134 Installing the functional testing plug-in 134 Testing guidance 136 Summary 137 Chapter 7: File Sharing 139 File domain object 139 FileController 140 File Upload GSP 141 Saving the file 143 Grails file upload 143 The save action 143 Validation messages 145 Viewing files 145 H5

6 Modeling for efficiency 147 Downloading files 149 Summary 150 Chapter 8: More GORM and Criteria 151 Sort order of relationships 153 Update validation messages 153 Querying with criteria 153 Comparing criteria and dynamic finders 154 Using logical operators 155 Querying across relationships 155 Specifying a fetch mode for relationships 156 Criteria reference 156 Logical criteria Setting criteria properties 158 Updating FileController 159 Updating the create file view 159 Handling save 160 Render file versions 161 Fix file download 164 Summary 164 Chapter 9: Services 165 Introducing services 165 Dependency injection 166 Service scope 167 Implementing FileService 168 Summary 172 Chapter 10: Managing Content through Tagging 173 Add basic tagging 173 Tagging domain model 174 The Tag class 174 The Tagger class 174 Tagging a message 176 Tagging a file GORM inheritance Taggable superclass 181 Polymorphic queries 182 Exposing tagging to the users 185 Add the Tags input field 185 Add multiple tags to Taggable 186 Saving the users tags 186 Displaying tags M

7 Customize the home page 189 Introducing templates 189 Passing data to a template 190 Render a map "191 Render an object "191 Render a collection 191 Template namespace 192 Create the message and file templates 192 User tags 193 User to tag relationship 193 User ProfileController 194 The mytags form 195 Personalizing the home page 196 Content service 196 Update the HomeController 199 Update the home page 199 All Messages and Files 201 Summary 204 Chapter 11: AJAX and RIA Frameworks 205 Edit tags inline 205 The remotelink tag 206 The formremote tag 207 Taggable controller 208 Tag views 209 Tagging domain changes 211 Include the Prototype library 211 Try it out 212 Auto-complete tags 213 Installing the RichU I 213 Implement the auto-complete 214 Suggest tags action 214 RichUI autocomplete widget 215 Introducing tag clouds 219 RichUI tag cloud component 219 Fetch the tag cloud map 221 Filter by tags 221 Rendering the tag cloud 224 Summary 225 Chapter 12: Searching, RSS, and REST Services 227 Searching 227 Make our objects searchable 228 Integrate searching 229

8 Table ofcontents RSS Site-wide search Create the search controller 230 View the search results Update the templates 232 More searching 234 A note about builders 235 Create the RSS feed 236 Remove authorization check REST services 239 REST overview URL mapping 240 Mapping to variables 241 Mapping to HTTP response codes 241 Mapping to HTTP methods 241 REST service mappings 242 Mapping to wildcards 242 Applying constraints 242 Our Message API mapping 243 Implementing the RESTful controller 243 Retrieving messages 244 Creating new messages 245 Authentication for REST API 247 A test script 248 Summary 250 Chapter 13: Build Your Own Plug-in 251 The tagger plug-in 251 Extract the tagging code 253 Accessing plug-in templates through Tag Libraries 253 Calling tags from controllers 255 Current limitations 256 Packaging a plug-in 256 Using plug-in events 257 Grails plug-in lifecycle events 257 dowithspring 258 dowithwebdescriptor 259 dowithapplicationcontext 259 dowithdynamicmethods 259 onchange and onconfigchange 259 Inspecting Grails artifacts 260 The GrailsApplication class 260 Find Taggable domain classes 261 Re-modeling tag relationships 262 Adding Taggable behavior

9 Groovy MetaClass Getting the home page working Items of Interest Create messages and files 272 Update tags List messages and files RSS Summary Chapter 14: Deployment and the Real World 283 Set up the environment 283 Install MySQL 283 Install Tomcat 284 Configure Grails 285 Set up the DataSource ^ ' DataSource configuration 285 Environmentally aware 286 Database management 287 Update your DB configuration 288 Control the bootstrap 289 Package the WAR file 291 Deploy 292 Hosting options 292 Next steps 292 Java Hibernate classes with GORM 292 Integrating with other presentation frameworks 293 Data migration 294 Summary 295 Index 297