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

Chapter 3: The Struts Shop


Exercise 2

How can we store the data in files instead of a database? What advantages and disadvantages would this have?

Every good book on databases will contain at least one chapter describing the situation before the development of databases. Spend some time creating the following file:

Listing A.1: Orders.txt
Wiesner, Stephan; Struts Book; 01.02.2004; 34,99
Müller, Lieschen; Grow Roses; 03.12.2003; 13,98
Beutling, Frodo; Adventure in the wilderness; 03.02.2004; 47,00
Bergsten, Dietrich, Programming for everybody; 05.05.2004

Now try to read the individual rows and columns and sort them. Search in the file for all the orders placed in a certain time frame and within certain price range. Naturally, you have to write a second program to access the file. You will now understand how strenuous this is and will learn to admire a good database.

A side aspect is naturally the resource hunger of any database. The Oracle 9 standard installation takes almost 1GB of space on disk. This is unimaginable for an application that runs on Mobile phones. On the other hand, HSQLDB (http://www.hsqldb.org), which is an open‑source Java Database, requires only 160 KB of main memory.