Google Web Toolkit Solutions
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Google Web Toolkit Solutions
Cu> Google Web Toolkit (GWT) is an open source Java development framework for building Ajax-enabled web applications. Instead of the hodgepodge of technologies that developers typically use for Ajax–JavaScript, HTML, CSS, and XMLHttpRequest–GWT lets developers implement rich client applications with pure Java, using familiar idioms from the AWT, Swing, and SWT. GWT goes beyond most Ajax frameworks by making it easy to build desktop-like applications that run in the ubiquitous browser, where the richness of the user interface is limited only by the developer’s imagination. This book focuses on the more advanced aspects of GWT that you need to implement real-world applications with rich user interfaces but without the heavy lifting of JavaScript and other Ajax-related technologies. Each solution in this practical, hands-on book is more than a recipe. The sample programs are carefully explained in detail to help you quickly master advanced GWT techniques, such as implementing drag-and-drop, integrating JavaScript libraries, and using advanced event handling methodologies. Solutions covered include • Building custom GWT widgets, including both high-level composites and low-level components • Implementing a viewport class that includes iPhone-style automated scrolling • Integrating web services with GWT applications • Incorporating the Script.aculo.us JavaScript framework into GWT applications • Combining Hibernate and GWT to implement database-backed web applications • Extending the GWT PopupPanel class to implement a draggable and resizable window • Creating a drag-and-drop module, complete with drag sources and drop targets • Deploying GWT applications to an external server • Dynamically resizing flex tables • Using GWT widgets in legacy applications developed with other frameworks, such as Struts and JavaServer Faces Complete Sample Code Available at www.coolandusefulgwt.com All of the code used in this book has been tested, both in hosted and web modes, and in an external version of Tomcat (version 5.5.17), under Windows, Linux, and Mac OS X. For Windows and Linux, we used 1.4.60, and for the Mac we used 1.4.61. NOTE: There are three separate versions of the code. Please download the correct JAR file for the operating system you are using. Foreword xiii Preface xvi Acknowledgments xviii About the Authors xix Solution 1: GWT Fundamentals and Beyond 1 Solution 2: JavaScript Integration 53 Solution 3: Custom Widget Implementation 71 Solution 4: Viewports and Maps 103 Solution 5: Access to Online Web Services 133 Solution 6: Drag and Drop 167 Solution 7: Simple Windows 199 Solution 8: Flex Tables 237 Solution 9: File Uploads 283 Solution 10: Hibernate Integration 303 Solution 11: Deployment to an External Server 325 Solution 12: GWT and Legacy Code 343 Index 371
Google Web Toolkit Solutions
Cu> Google Web Toolkit (GWT) is an open source Java development framework for building Ajax-enabled web applications. Instead of the hodgepodge of technologies that developers typically use for Ajax–JavaScript, HTML, CSS, and XMLHttpRequest–GWT lets developers implement rich client applications with pure Java, using familiar idioms from the AWT, Swing, and SWT. GWT goes beyond most Ajax frameworks by making it easy to build desktop-like applications that run in the ubiquitous browser, where the richness of the user interface is limited only by the developer’s imagination. This book focuses on the more advanced aspects of GWT that you need to implement real-world applications with rich user interfaces but without the heavy lifting of JavaScript and other Ajax-related technologies. Each solution in this practical, hands-on book is more than a recipe. The sample programs are carefully explained in detail to help you quickly master advanced GWT techniques, such as implementing drag-and-drop, integrating JavaScript libraries, and using advanced event handling methodologies. Solutions covered include • Building custom GWT widgets, including both high-level composites and low-level components • Implementing a viewport class that includes iPhone-style automated scrolling • Integrating web services with GWT applications • Incorporating the Script.aculo.us JavaScript framework into GWT applications • Combining Hibernate and GWT to implement database-backed web applications • Extending the GWT PopupPanel class to implement a draggable and resizable window • Creating a drag-and-drop module, complete with drag sources and drop targets • Deploying GWT applications to an external server • Dynamically resizing flex tables • Using GWT widgets in legacy applications developed with other frameworks, such as Struts and JavaServer Faces Complete Sample Code Available at www.coolandusefulgwt.com All of the code used in this book has been tested, both in hosted and web modes, and in an external version of Tomcat (version 5.5.17), under Windows, Linux, and Mac OS X. For Windows and Linux, we used 1.4.60, and for the Mac we used 1.4.61. NOTE: There are three separate versions of the code. Please download the correct JAR file for the operating system you are using. Foreword xiii Preface xvi Acknowledgments xviii About the Authors xix Solution 1: GWT Fundamentals and Beyond 1 Solution 2: JavaScript Integration 53 Solution 3: Custom Widget Implementation 71 Solution 4: Viewports and Maps 103 Solution 5: Access to Online Web Services 133 Solution 6: Drag and Drop 167 Solution 7: Simple Windows 199 Solution 8: Flex Tables 237 Solution 9: File Uploads 283 Solution 10: Hibernate Integration 303 Solution 11: Deployment to an External Server 325 Solution 12: GWT and Legacy Code 343 Index 371
Google Web Toolkit Applications
“Ryan clearly understands the GWT value proposition and how GWT integrates into a diverse web technology stack—and not just in a theoretical way. With the popularity of gpokr.com and kdice.com, Ryan can speak with the authority of concrete success.” —Bruce Johnson, creator of Google Web Toolkit “This book distinguishes itself from other books on GWT in that it walks through the entire process of building several nontrivial GWT applications, not the toy applications that most books present.” —R. Mark Volkmann, Object Computing, Inc. “GoogleTM Web Toolkit Applications is an excellent resource for any GWT developer. Solutions to challenges commonly encountered in GWT are presented through the design and development of actual applications. The applications developed throughout the text demonstrate best practices from simple UI design all the way to custom code generation, and are presented with little pretext about the amount of Java knowledge a given developer may have. Advanced concepts are not withheld but are presented in a way that will be understood by both novice and seasoned developers alike. Good application development practices and proper Model View Controller design is reinforced throughout the book, nearly guaranteeing that the reader will come away a better programmer. “ —Jason Essington, Senior Web/Java Engineer, Green River Computing “Dewsbury’s GoogleTM Web Toolkit Applications is a book for both experts and beginner programmers who want to discover this open source Java software development framework, as well as write Ajax applications. A very detailed book!” —Massimo Nardone, Advisory IT Security Architect Accelerate and Simplify Ajax Development with Google Web Toolkit Get the edge you need to deliver exceptional user experiences with GoogleTM Web Toolkit Applications, a guidebook that provides web developers with core information and instructions for creating rich web applications. Whether you’re a developer who needs to build a high-performance front end for Java, PHP, or Ruby applications, or to integrate with external web services, this resource from expert Google Web Toolkit (GWT) developer Ryan Dewsbury delivers the in-depth coverage you’ll need. In this valuable book, insider Ryan Dewsbury provides instructions for using the robust tool set and gets you on your way to creating first-class web applications by providing a comprehensive overview of GWT technology. In addition, he shares his “in-the-trenches” insights on Building elegant and responsive user interfaces with Cascading Style Sheets and GWT’s Widgets and Panels Creating seamless user experiences through asynchronous communication with HTTP, REST, JSON/JSONP, and RPC Interoperating with web standards—such as XML, RSS, and Atom—and web services—such as Google Maps, Amazon Books, Yahoo! Search, Flickr, and Blogger Overcoming browser security restrictions, such as HTTP’s two-connection limit and the Same-Origin policy Accelerating development, using software engineering, code generation, internationalization, application patterns, and Java tools Deploying for optimal performance with resource compression and caching Building five non-trivial applications: a gadget application with a rich drag-and-drop interface, a multi-search application that makes requests to many search engines, a blog editor application for managing entries across multiple blogs, a web-based instant messenger, and a database manager for a traditional web page This practical guide to GWT introduces you to the technology; provides techniques, tips, and examples; and puts you on the road to delivering top-notch user experiences for your web applications.