Designing Enterprise Applicationswith the J2EETM Platform 2nd phần 1 pot

[...]... Application 347 11 .1 J2EE Architecture Approaches 348 11 .1. 1 Model-View-Controller Architecture 348 xi DEA2e.book Page xii Friday, March 8, 2002 12 : 31 AM xii CONTENTS 11 .2 11 .3 11 .4 11 .5 11 .6 11 .1. 2 J2EE Design Patterns 350 Sample Application Overview 352 Designing the Sample Application ... 309 10 J2EE Internationalization and Localization 311 10 .1 Internationalization Concepts and Terminology 312 10 .1. 1 Internationalization, Localization, and Locale 312 10 .1. 2 Character Sets 313 10 .1. 3 Encodings 314 10 .2 Using J2SE Internationalization APIs in J2EE Applications 316 10 .2 .1. .. one or two people may perform all these roles, while on others 11 DEA2e.book Page 12 Friday, March 8, 2002 12 : 31 AM 12 CHAPTER 1 INTRODUCTION these tasks may be further subdivided into more specific skill sets (such as user interface designers, programmers, and so on) 1. 2.2.2 Integrating Existing Enterprise Information Systems The J2EE platform, together with the J2SE platform, includes a number of industry... together— and building smarter—can be the key to successfully growing a marketplace that offers more for everyone With the release of the J2EE 1. 3 platform, the momentum continues Six months after the initial release of the J2EE 1. 3 platform, the introduction of compatible products is running 56% over the rate for the previous version Part of the reason for this phenomenal uptake is, of course, the. .. 8, 2002 12 : 31 AM THE PLATFORM FOR ENTERPRISE SOLUTIONS In many ways, the J2EE platform and EJB architecture have complementary goals The EJB component model is the backbone of industrial-strength application architectures in the J2EE programming model The J2EE platform complements the EJB specification by: • Fully specifying the APIs that an enterprise bean developer can use to implement enterprise. .. Defining the larger, distributed programming environment in which enterprise beans are used as business logic components 1. 2 .1. 5 Support for the J2EE Standard The J2EE standard is defined through a set of related specifications Key among these are the J2EE specification, the Enterprise JavaBeans specification, the Java Servlet specification, and the JavaServer Pages specification Together, these specifications... Friday, March 8, 2002 12 : 31 AM 10 CHAPTER 1 INTRODUCTION development, and the J2EE Tutorial, which provides step-by-step examples and information that developers need to begin working with the platform Another word on J2EE standards and portability: The J2EE specifications have, by design, set the platform- compatibility bar at a level that’s relatively easy to clear Because the platform specifications... component-based development model Because it is based on the Java programming language and the Java 2 Platform, Standard Edition (J2SETM platform) , this model offers “Write-Once-Run-AnywhereTM” portability, supported by any server product that conforms to the J2EE standard DEA2e.book Page 11 Friday, March 8, 2002 12 : 31 AM THE PLATFORM FOR ENTERPRISE SOLUTIONS The component-based J2EE development model can enhance... and back-end enterprise information systems providing data management Figure 1. 1 illustrates the various components and services that make up a typical J2EE environment Figure 1. 1 1. 2 .1. 1 J2EE Environment Multitier Model As illustrated, the J2EE platform provides a multitier distributed application model This means that the various parts of an application can run on different devices The DEA2e.book... the client tier, business logic is often implemented on the J2EE platform in the middle tier as Enterprise JavaBeans components (also known as enterprise beans) Enterprise beans allow the component or application developer to concentrate on the business logic while the complexities of delivering a reliable, scalable service are handled by the EJB container DEA2e.book Page 9 Friday, March 8, 2002 12 :31 . 345 11 Architecture of the Sample Application . . . . . . . . . . . . . . . . . . . . .347 11 .1 J2EE Architecture Approaches . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348 11 .1. 1 Model-View-Controller. 5 1. 2 The Platform for Enterprise Solutions . . . . . . . . . . . . . . . . . . . . . . . . 5 1. 2 .1 J2EE Platform Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1. 2.2 J2EE Platform. . . . 309 10 J2EE Internationalization and Localization . . . . . . . . . . . . . . . . . 311 10 .1 Internationalization Concepts and Terminology. . . . . . . . . . . . . . . 312 10 .1. 1 Internationalization,