Core J2EE Patterns: Best Practices and Design Strategies
Prentice Hall PTR, 2001 - 459 ページ
Over the last few years, Java 2 Platform, Enterprise Edition (J2EE) technology has emerged and matured as a standard platform for building enterprise applications. While the platform has matured into a solid offering for developing and deploying enterprise applications, it does offer its challenges. As developers, often we confuse learning the technology with learning to design with the technology. In this book, senior architects from the Sun Java Center, Sun's Java consulting organization share with the reader their cumulative design experience with and expertise on J2EE technology.
The primary focus of the book is on patterns, best practices, design strategies, and proven solutions using the key J2EE technologies including JavaServer Pages (JSP), Servlets, Enterprise Java Beans (EJB), and Java Message Service (J.M.S) API. Other ancillary technologies like JDBC and JNDI are also discussed as relevant to their usage in these patterns. The J2EE Patterns catalog with 16 patterns and numerous strategies is presented to document and promote best practices for these technologies.
In addition to the patterns and strategies, the book offers the following:
Core J2EE Patterns delivers:
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General Refactorings Separate Data Access Code Data access code is
embedded directly within a class that has other unrelated responsibilities. Extract
the data access code into a new class and move the new class logically and lor ...
Example Consider an example where a servlet has embedded data access code
to access some user information. Applying the first two bullets, assume we
change the design, as shown in Figure 5.22. Figure 5.22 Separate Data Access
Such disparate data sources offer challenges to the application and can
potentially create a direct dependency between application code and data
access code. When business components — entity beans, session beans, and
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J2EE Platform Overview
Design Considerations Bad Practices and Refactorings
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