Book Image

Learning Jakarta Struts 1.2: a concise and practical tutorial

By : Stephan Wiesner
Book Image

Learning Jakarta Struts 1.2: a concise and practical tutorial

By: Stephan Wiesner

Overview of this book

<p>Jakarta Struts is an Open Source Java framework for developing web applications. By cleanly separating logic and presentation, Struts makes applications more manageable and maintainable.<br />Since its donation to the Apache Foundation&nbsp; in 2001, Struts has been rapidly accepted as the leading Java web application framework, and community support and development is well established.<br /><br />Struts-based web sites are built from the ground up to be easily modifiable and maintainable, and internationalization and flexibility of design are deeply rooted. Struts uses the Model-View-Controller design pattern to enforce a strict separation between processing logic and presentation logic, and enables efficient object re-use.<br /><br />The book is written as a structured tutorial, with each chapter building on the last. The book begins by introducing the architecture of a Struts application in terms of the Model-View-Controller pattern. Having explained how to install Jakarta and Struts, the book then goes straight into an initial implementation of the book store. The well structured code of the book store application is explained and related simply to the architectural issues.<br /><br />Custom Actions, internationalization and the possibilities offered by Taglibs are covered early to illustrate the power and flexibility inherent in the framework. The bookstore application is then enhanced in functionality and quality through the addition of logging and configuration data, and well-crafted forms. At each stage of enhancement, the design issues are laid out succinctly, then the practical implementation explained clearly. This combination of theory and practical example lays a solid understanding of both the principles and the practice of building Struts applications.</p>
Table of Contents (20 chapters)
Learning Jakarta Struts 1.2
Credits
Preface
About the Book
Glossary
Literature

9.1 Consistent Layout without Struts


Let’s start by creating a new context shop5, as a copy of shop4.

First, we will develop our own controller servlet and then look at possibilities offered by Struts. This will give us a thorough understanding of the controller’s function and will highlight particular problems such as having to restart the context after each modification in the configuration file. You should view the first part as the theoretical background (despite the purely practical approach) that precedes the actual work in the second part.

9.1.1 Why Central Control?

This is the first question we should consider. It is definitely possible to create a main menu, perhaps with HTML frames, that allows all JSP pages to be accessed via direct links. We can also connect individual pages with each other directly, for instance, in the way BookView.jsp follows Book.jsp. This approach is certainly simple and

sensible for small and straightforward pages, but for large projects, it could easily lead...