J2EE 模式设计指南：最佳实践和策略

需积分: 43 21 浏览量更新于2024-07-26 收藏 3.1MB PDF 举报

Core J2EE 模式 - 最佳实践和设计策略 Core J2EE 模式：Best Practices and Design Strategies 这本书旨在为 Java 2 Platform, Enterprise Edition（J2EE）架构师和开发者提供实用的指南，帮助他们设计和实现高效、可扩展、可维护的企业级应用程序。本书涵盖了 J2EE 模式、设计策略、最佳实践和反模式等多方面的内容。 **J2EE 模式是什么？** J2EE 模式是指在 J2EE 平台上开发企业级应用程序时所使用的一些通用解决方案和最佳实践。这些模式可以帮助开发者解决常见的问题，提高开发效率和应用程序的质量。 **J2EE 平台概述** J2EE 平台是一种基于 Java 的企业级应用程序开发平台，由 Sun Microsystems 公司开发。J2EE 平台提供了一系列的 API 和工具，帮助开发者快速开发企业级应用程序。J2EE 平台包括 Web 容器、EJB 容器、JMS provider、JNDI provider 等多个组件。 **J2EE 模式目录** J2EE 模式目录是指 J2EE 平台中所有模式的集合。这些模式涵盖了 Presentation Tier、Business Tier 和 Integration Tier 等多个方面，帮助开发者设计和实现高效、可扩展、可维护的企业级应用程序。 **模式、框架和重用** 模式、框架和重用是 J2EE 平台中三个紧密相关的概念。模式是指解决特定问题的通用解决方案，框架是指实现模式的具体实现，重用是指在不同的应用程序中重用模式和框架。 **Presentation Tier 设计考虑和反模式** Presentation Tier 是指 J2EE 应用程序的用户界面层。Presentation Tier 设计考虑包括如何设计高效的用户界面、如何实现 internacionalization 和 localization、如何处理用户输入等。反模式是指一些常见的设计错误，例如使用过多的 JavaScript、忽视 Accessibility 等。 **Business Tier 设计考虑和反模式** Business Tier 是指 J2EE 应用程序的业务逻辑层。Business Tier 设计考虑包括如何设计高效的业务逻辑、如何实现事务处理、如何处理异常等。反模式是指一些常见的设计错误，例如使用过多的 Database Query、忽视 Transaction 等。 **J2EE 重构** J2EE 重构是指对 J2EE 应用程序进行重新设计和改进，以提高应用程序的性能、可扩展性和可维护性。重构可以包括 Presentation Tier 重构、Business Tier 重构和 Integration Tier 重构等。 **J2EE 模式目录概述** J2EE 模式目录概述是指对 J2EE 模式的总体介绍。该部分涵盖了 J2EE 模式的定义、J2EE 模式的分类、J2EE 模式的使用等多方面的内容。 **结论** Core J2EE 模式：Best Practices and Design Strategies 是一本非常实用的书籍，对于 J2EE 架构师和开发者来说非常有价值。本书涵盖了 J2EE 模式、设计策略、最佳实践和反模式等多方面的内容，帮助开发者设计和实现高效、可扩展、可维护的企业级应用程序。

- 15 -

The last few years have been extraordinary with respect to the

changing landscape of enterprise software development. At the

center of this change is the Java 2 Platform, Enterprise Edition (J2EE),

which provides a unified platform for developing distributed,

server-centric applications. The widespread adoption of the strategic,

enabling technologies of the J2EE have provided the development

community with open standards on which to build service-based

architectures for the enterprise.

At the same time, learning J2EE technologies is too often confused

with learning to design with J2EE technologies. Many existing Java

books do an excellent job of explaining specific aspects of the

technology, but are not always clear on how to apply it.

A J2EE architect needs to understand more than the relevant APIs,

including

• What are the best practices?

• What are the bad practices?

• What are the common recurring problems and proven solutions

to these problems?

• How is code refactored from a less optimal scenario, or bad

practice, to a better one typically described by a pattern?

That is what this book is all about. Good designs are discovered from

experience. When these designs are communicated as patterns using

a standard pattern template, they become a powerful mechanism for

communication exchange and reuse, and can be leveraged to improve

the way we design and build software.

What Is J2EE?

J2EE is a platform for developing distributed enterprise software

applications. Since the inception of the Java language, it has

undergone tremendous adoption and growth. More and more

technologies have become part of the Java platform, and new APIs

and standards have been developed to address various needs.

Eventually, Sun and a group of industry leaders, under the auspices of

the open Java Community Process (JCP), unified all these

enterprise-related standards and APIs into the J2EE Platform.

The J2EE Platform offers numerous advantages to the enterprise:

• J2EE establishes standards for areas of enterprise computing

needs such as database connectivity, enterprise business

- 16 -

components, message-oriented middleware (MOM),

Web-related components, communication protocols, and

interoperability.

• J2EE promotes best-of-breed implementations based on open

standards, protecting technological investment.

• J2EE provides a standard platform for building software

components that are portable across vendor implementations,

avoiding vendor lock-in.

• J2EE increases time-to-market since much of the infrastructure

and plumbing is provided by the vendors' products that are

implemented according to the standard J2EE specification. IT

organizations can now get out of the middleware business and

concentrate on building applications for their business.

• J2EE increases programmer productivity, since Java

programmers can relatively easily learn J2EE technologies

based on the Java language. All enterprise software

development can be accomplished under the J2EE platform,

using Java as the programming language.

• J2EE promotes interoperability within existing heterogenous

environments.

We discuss the J2EE Platform in greater detail in Chapter 2, so refer to

that chapter for more information. Now we will take a brief look at

patterns, their history, and the types of patterns in the J2EE Pattern

Catalog that you will find in Part 3 of this book.

What Are Patterns?

Historical References

In the 1970s, Christopher Alexander [Alex, Alex2] wrote a number of

books documenting patterns in civil engineering and architecture. The

software community subsequently adopted the idea of patterns based

on his work, though there was burgeoning interest in the software

community in these ideas already.

Patterns in software were popularized by the book Design Patterns:

Elements of Reusable Object-Oriented Software by Erich Gamma,

Richard Helm, Ralph Johnson, and John Vlissides (also known as the

Gang of Four, or GoF). Of course, while the Gang of Four work

resulted in patterns becoming a common discussion topic in software

development teams around the world, the important point to

remember is that the patterns they describe were not invented by

- 19 -

taxonomies have been suggested, there is no one right way to

document these ideas.

We refer to the patterns in the catalog simply as “J2EE patterns”. Each

pattern hovers somewhere between a design pattern and an

architectural pattern, while the strategies document portions of each

pattern at a lower level of abstraction. The only scheme we have

introduced is to classify each pattern within one of the following three

logical architectural tiers:

• presentation tier

• business tier

• integration tier

At some point in the evolution of the pattern catalog, perhaps it will

grow to a size that will warrant its being classified using a more

sophisticated scheme. Currently, however, we prefer to keep things

simple and not to introduce any new terms unnecessarily.

J2EE Pattern Catalog

Continuous Evolution

The J2EE patterns described in this book are based on our collective

experience of working on the J2EE platform with Sun Java Center

clients around the world. The Sun Java Center, a part of Sun

Professional Services, is a consulting organization focused on building

Java technology-based solutions for customers. We have been

creating solutions for the J2EE platform since the platform's inception,

focusing on achieving Quality of Service goals such as scalability,

availability, and performance.

During the early days, as we designed, developed, and implemented

various systems on the J2EE platform, we started documenting our

experiences in an informal way as design considerations, ideas, and

notes. As the knowledge base grew, we recognized a need for a

slightly more formal documentation to capture and communicate this

knowledge. We transitioned to documenting these ideas as patterns,

since patterns are ideally suited to capturing and communicating

knowledge related to recurring problems and solutions.

The first order of business was to sort out the level of abstraction with

which the patterns were to be documented. Some problems and

solutions overlapped others in that the core of the problem was the

剩余419页未读，继续阅读

wowcxy2009

粉丝: 0
资源: 1

J2EE 模式设计指南：最佳实践和策略

React Design Patterns and Best Practices [2017]

Design Patterns and Best Practices in Java

Core J2EE Patterns - Best Practices and Design Strategies - 2nd Edition

设计一个有L1、L2、L3三个指示灯的循环流水灯电路，1表示灯亮，0表示灯灭

怎样在flink中配置flinkcdc

vue3+ts+vite 如何使用credit-card-type

用python写一个垃圾数据过滤

wsl opensuse patterns-wsl-systemd

能不能找出那种专著类型的参考文献至少三个外文的，跟Java，JavaEE有关的并且是2018年以后的

patterns, principles, and practices of domain-driven design mobi pdf

最新资源