Apple WebObjects 5 Uživatelský manuál Strana 19
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Hodnocené. / 5. Na základě hodnocení zákazníků
CHAPTER 2
What Is WebObjects?
Rapid Development
19
Apple Computer, Inc. January 2002
Rapid Development
WebObjects is both powerful and flexible. With that power and flexibility, however,
comes a certain degree of complexity. For many applications, whether HTML-based
or Java Client–based, it’s more important to develop the application quickly than
strive for maximum flexibility or polish. As an example, a simple data-browsing
and editing application, intended only for internal use by a system administrator,
probably wouldn’t warrant the same degree of effort you would put into an
Internet-enabled application accessible by the general public. To simplify the
development of applications like the former, WebObjects includes a set of
rapid-development technologies: Direct to Web and Direct to Java Client.
Direct to Web and Direct to Java Client are similar in approach. Their primary
difference is in how the application interacts with the end user. Direct to Web
creates HTML-based WebObjects applications, whereas Direct to Java Client creates
WebObjects applications that employ Java Client to partition the application
between server and client. Both are useful not only for creating simple database
browser applications, but in many situations can also serve as rapid prototyping
tools. Because Direct to Web and Direct to Java Client both allow customization on
various levels, they are well-suited for bootstrapping and creating your
mission-critical applications.
Direct to Web
Direct to Web is a system for creating HTML-based WebObjects applications that
access a database. All Direct to Web needs to create the application is a model of the
database, which you can build using EOModeler (a data-modeling tool).
Direct to Web applications are not a set of static Web pages. Instead, Direct to Web
uses information from the data model available at runtime to dynamically generate
the pages. Consequently, you can modify your application’s configuration at
runtime—using the Direct to Web Assistant—to hide objects of a particular class,
hide their properties, reorder properties, and change the way they are displayed
without recompiling or relaunching the application.
- WebObjects Overview 1
- Contents 3
- CONTENTS 4
- Figures and Tables 7
- FIGURES AND TABLES 8
- 1 About This Book 9
- Further Investigations 10
- Online Documentation 11
- 2 What Is WebObjects? 13
- CHAPTER 2 16
- Java Client Applications 17
- Rapid Development 19
- The WebObjects Advantage 20
- State Management 21
- 3 Enterprise Objects 25
- CHAPTER 3 26
- Paradigm 28
- 34
- 4 HTML-Based Applications 37
- CHAPTER 4 38
- Dynamic Elements 39
- Reusing Components 40
- Maintaining State 41
- The WebObjects Architecture 43
- Project Builder 45
- WebObjects Builder 46
- 5 Direct to Web Applications 49
- CHAPTER 5 50
- Figure 5-2 A query-all page 50
- Figure 5-3 A query page 51
- Figure 5-4 A list page 52
- Figure 5-5 An inspect page 52
- Figure 5-6 An edit page 53
- Figure 5-8 The menu header 54
- How Direct to Web Works 55
- The Direct to Web Assistant 58
- Figure 5-15 The Rule Editor 61
- Limitations 63
- 6 WebObjects Desktop 65
- Applications 65
- Java Client Features 66
- Better User Experience 67
- Object Distribution 67
- The Best of WebObjects 67
- Deployment Options 68
- Rapid Application Development 68
- When To Choose Java Client 69
- CHAPTER 6 70
- Two Approaches to Java Client 71
- Choosing an Approach 74
- Java Client Architecture 76
- 78 Java Client Architecture 78
- Managing the User Interface 79
- Development Tasks and Tools 83
- 7 J2EE Integration 87
- Enterprise JavaBeans 88
- JSP and Servlets 89
- 8 Choosing Your Approach 91
- User Interface Requirements 92
- CHAPTER 8 93
- Combining Approaches 94
- Adding Rapid Development 95
- Where to Go From Here 96
- 9 Glossary 97
- GLOSSARY 100
- Glossary 102
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