Core JavaServer Faces (Sun Microsystems Press Java Series) - ISBN 0131463055.pdf

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Faces (JSF) at the 2002 Java One conference,

we were very excited. Both of us had extensive experience with client-side Java

programming, and had lived to tell the tale—David in

™

Graphic Java

, and Cay in

, both published by Sun Microsystems Press. When we ﬁrst tried web

programming with servlets and JavaServer Pages (JSP), we found it to be

rather unintuitive and tedious. JavaServer

promised to put a friendly face

in front of a web application, allowing programmers to think about text ﬁelds

and menus instead of fretting over page ﬂips and request parameters. Each of

us proposed a book project to the publisher, who promptly suggested that we

should jointly write the Sun Microsystems Press book on this technology.

It took the JSF expert group (of which David is a member) another two years to

release the JSF 1.0 speciﬁcation and reference implementation. This release ful-

ﬁlls many of the original promises. You really can design web user interfaces

by putting components on a form and linking them to Java objects, without

having to write any code at all. The framework was designed for tool support,

and the ﬁrst batch of drag-and-drop GUI builders is now emerging. The frame-

work is extensible—you are not limited to the standard set of HTML compo-

nents, and you can even use completely different rendering technologies, to

support, for example, wireless devices. And ﬁnally, unlike competing technolo-

gies that let you tumble down a deep cliff once you step beyond the glitz, JSF

supports the hard stuff—separation of presentation and business logic, naviga-

tion, connections with external services, and conﬁguration management.

Faces

When we heard about JavaServer

Core Java

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xvi

Preface

Of course, being a 1.0 release, the current version of JSF is far from perfect.

Some of the APIs are awkward. We supply you with utility classes in the

package to reduce your pain. Also, there are fewer components

than we originally expected. While JSF has a powerful and convenient data

table component, some useful components such as tabbed panes, scrollers, ﬁle

uploads, and so on, were not included for lack of time. In the book, we show

you how to implement these features. Of course, we expect the next release of

JSF to remedy many of these shortcomings.

We are still excited about JSF, and we hope you will share this excitement when

you learn how this technology makes you a more effective web application

developer.

About This Book

. These tags are similar to HTML form tags. They are the basic building

blocks for JSF user interfaces. No programming is required for use of to use the

tags. We only assume only basic HTML skills for web pages and standard Java

programming for the business logic.

The ﬁrst part of the book covers these topics:

• Setting up your programming environment (Chapter 1)

• Connecting JSF tags to application logic (Chapter 2)

• Navigating between pages (Chapter 3)

• Using the standard JSF tags (Chapters 4 and 5)

• Converting and validating input (Chapter 6)

Starting with the ﬁnal sections of Chapter 6, we begin JSF programming in ear-

nest. You will learn how to perform advanced tasks, and how to extend the JSF

framework. Here are the main topics of the second part:

•

tags

Implementing custom converters and validators (Chapter 6)

•

Event handling (Chapter 7)

•

Including common content among multiple pages (Chapter 8)

•

Implementing custom components (Chapter 9)

•

Connecting to databases and other external services (Chapter 10)

com.corejsf.util

This book is suitable for web developers whose main focus is user interface

design, as well as for programmers who implement reusable components for

web applications. This is in stark contrast to the ofﬁcial JSF speciﬁcation, a

dense and pompously worded document whose principal audience is frame-

work implementors, as well as long-suffering book authors.

The ﬁrst half of the book, extending to the middle of Chapter 6, focuses on the

JSF

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Preface

xvii

• Supporting wireless clients (Chapter 11)

We end the book with a chapter that aims to answer common questions of the

form “How do I….?” We encourage you to have a peek at that chapter as soon

as you become comfortable with the basics of JSF. There are helpful notes on

debugging and logging, and we also give you implementation details and

working code for features that are missing from JSF 1.0, such as ﬁle uploads,

popup menus, and a pager component for long tables.

JSF is built on top of servlets and JSP, but from the point of view of the JSF

developer, these technologies merely form the low-level plumbing. While it

can’t hurt to be familiar with other web technologies such as servlets, JSP, or

Struts, we do not assume any such knowledge.

Required Software

All software that you need for this book is freely available. You need the Java

Software Development Kit from Sun Microsystems, a servlet container such as

Tomcat, and, of course, a JSF implementation, such as Sun’s reference imple-

mentation. The software runs identically on Linux, Mac OS X, Solaris, and Win-

dows. We used the 1.4.2 J2SE and Tomcat 5.0.19 on both Linux and Mac OS X to

develop the code examples in the book.

We also expect that integrated environments will become commercially avail-

able in the near future.

Web Support

The web page for this book is

http://corejsf.com

. It contains

•

The source code for all examples in this book

•

Useful reference material that we felt is more effective in browseable form

than in print

•

A list of known errors in the book and the code

•

A form for submitting corrections and suggestions

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First and foremost, we’d like to thank Greg Doench, our editor at Prentice Hall,

who has shepherded us through this project, never losing his nerve in spite of

numerous delays and complications. Thanks to Mary Lou Nohr for editing the

manuscript, and to Patti Guerrieri for her production work. We very much

appreciate our reviewers who have done a splendid job, ﬁnding errors and

suggesting improvements in various drafts of the manuscript. They are:

•

Larry Brown

•

Frank Cohen

•

Rob Gordon, all-around Java guru and author of

Essential JNI

•

Marty Hall, author of

Core Java Servlets and JavaServer Pages

•

Jeff Markham

•

Angus McIntyre

•

John Muchow, author of

Core J2ME

•

Sergei Smirnov of Exadel Inc.

•

Roman Smolgovsky of Flytecomm

•

Stephen Stelting

•

Christopher Taylor

•

Michael Yuan, author of

Enterprise J2ME

Finally, thanks to our families and friends who have supported us through this

project and who share our relief that it is ﬁnally completed.

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