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Core JSTL: Mastering the JSP™ Standard Tag Library

Name: Core JSTL: Mastering the JSP™ Standard Tag Library
Author: David M. Geary
ISBN: 0131001531

by David M. Geary

November 2002

Intermediate to advanced

608 pages

12h 17m

English

Pearson

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Copyright
About Prentice Hall Professional Technical Reference
Preface
1.1. What This Book Is About1.2. The Servlet and JSP APIs This Book Depends Upon1.3. The Book's Web Site1.4. How This Book's Code Was Tested1.5. This Book's Audience1.6. How To Use This Book1.7. Conventions Used in This Book
Acknowledgments
1. Introduction
1.1. JSTL OverviewWhat Is JSTL?The JSTL Expression LanguageThe JSTL Tag LibrariesTwin LibrariesCore ActionsFormatting ActionsSQL ActionsXML ActionsThe JSTL Tag Library Validators1.2. Getting StartedThe JSTL SpecificationThe JSTL Reference ImplementationDownloading and Installing a Servlet ContainerTomcatResin1.3. A Simple JSTL Web Application1.4. JSTL Design PrinciplesNaming Conventions for JSTL ActionsScoped Variables vs. Scripting VariablesThe var and scope AttributesScoped Variable VisibilityStatic vs. Dynamic Action AttributesError HandlingConfiguration Settings
2. The JSTL Expression Language
2.1. Expression Language OverviewHow the Expression Language WorksHow to Use the Expression Language2.2. Expressions2.3. Identifiers2.4. OperatorsOperator PrecedenceThe . and [] OperatorsAccessing JavaBeans ComponentsAccessing Objects Stored in Arrays, Lists, and MapsA Closer Look at the [] OperatorThe [] Operator's Special AbilityThe empty Operator2.5. Type Coercion2.6. Literal Values2.7. Implicit ObjectsAccessing Request ParametersAccessing Request HeadersAccessing Context Initialization ParametersAccessing CookiesAccessing Scoped AttributesAccessing JSP Page and Servlet Properties2.8. Method Invocation2.9. EL Expressions in Custom Actions2.10. Common MistakesForgetting Curly BracesForgetting taglib DeclarationsNeglecting to Store Variables in a ScopeUsing Illegal Characters for Attribute ValuesInadvertently Using Implicit Objects
3. General-Purpose and Conditional Actions
3.1. General-Purpose ActionsThe <c:out> ActionSetting Attributes for HTML ElementsRetaining Values for HTML Text ElementsAccessing Bean PropertiesThe <c:set> ActionSetting Bean Properties and Map EntriesSetting Bean PropertiesSetting Compound Bean PropertiesAdding, Removing, and Modifying Map EntriesThe <c:remove> ActionThe <c:catch> Action3.2. Conditional ActionsSimple ConditionsRetaining Values for HTML Option ElementsMutually Exclusive ConditionsImplementing If/Else ConstructsImplementing Switch Statement Constructs3.3. Using Conditional and General-Purpose Actions Together3.4. Conditional Custom Actions
4. Iteration Actions
4.1. The <c:forEach> ActionIterating Over Integer ValuesIterating Over Data StructuresUsing the begin, end, and step Attributes for Data Structures4.2. The <c:forTokens> Action4.3. Iteration StatusIteration Status for Integer IterationsIteration Status for Data Structure Iterations4.4. Custom Iteration ActionsCollaboration Custom ActionsIteration Custom ActionsCustom Actions That Iterate Over Integer ValuesCustom Actions That Iterate Over Data Structures
5. URL Actions
5.1. Overview5.2. The <c:import> Action5.3. The <c:redirect> Action5.4. The <c:url> Action5.5. The <c:param> Action5.6. Accessing External Resources5.7. Accessing Resources in Foreign Contexts5.8. Redirecting a Response
6. Configuration Settings
6.1. OverviewThe FMT_LOCALE Configuration SettingTemporarily Overriding Configuration Settings6.2. The Config ClassAccessing Configuration Settings in ServletsAccessing Configuration Settings in Life-Cycle ListenersAccessing Configuration Settings in Custom Actions

7. I18N Actions
7.1. OverviewLocalizing MessagesMultiple Resource BundlesCompound Messages7.2. I18N and L10NLocalesResource BundlesResource Bundles as Properties FilesResource Bundles as Java ClassesUnicode and Charsets7.3. Localization Contexts7.4. An Overview of the I18N Actions7.5. Use of <fmt:message>Localization Context Lookup1. If the <fmt:message> bundle attribute is specified, use it.2. If the <fmt:message> action is nested in a <fmt:bundle>, use the enclosing <fmt:bundle> action's localization context.3. Use the FMT_LOCALIZATION_CONTEXT configuration setting.Resource Bundle LookupLocalesThe Resource Bundle Lookup AlgorithmAn Example of Dynamically Switching LocalesCompound Messages and <fmt:param>7.6. Request Encoding7.7. I18NCustom ActionsValidation with JSP PagesValidation with a Custom Action That Uses javax.servlet.jsp.jstl.fmt.LocaleSupport
8. Formatting Actions
8.1. Formatting and Parsing NumbersCustom Number PatternsPercentsCurrencies8.2. Formatting and Parsing Dates and TimesCustom Patterns for Dates and Times8.3. Using Time Zones8.4. Determining a Formatting Locale1. An Enclosing <fmt:bundle> Action2. The FMT_LOCALIZATION_CONTEXT Configuration Setting3. Formatting Locale LookupFormatting Locale Lookup
9. Database Actions
9.1. OverviewSQL ActionsConfiguration Settings9.2. A Simple Database9.3. How JSTL Locates Data Sources9.4. Creating Data SourcesSpecify Your Data Source in the Deployment DescriptorSpecify Your Data Source with <sql:setDataSource>Create Your Data Source in a Business ComponentA Simple Data SourceCreating a Data Source in an Initialization Servlet9.5. Querying a DatabaseUsing <sql:query>Accessing Query PropertiesScrolling Through Large QueriesPrepared Statements and SQL ParametersDate Parameters9.6. Updating a DatabaseDatabase InsertsDatabase UpdatesDatabase Deletes9.7. Executing Database Transactions9.8. Implementing Database Custom Actions
10. XML Actions
10.1. A Simple XML File10.2. XML Actions Overview10.3. XPath OverviewXPath Expressions and TypesXPath Type CoercionXPath Functions10.4. Parsing XML10.5. Using Scoped Variables in XPath Expressions10.6. Transforming XML with XSLTUsing Transformation Parameters10.7. Filtering XML10.8. Accessing External Entities
11. JSTL Reference
11.1. Action Reference IndexCore ActionsFormatting ActionsSQL ActionsXML ActionsExposed Classes and Interfaces IndexCore Classes and InterfacesFormatting Classes and InterfacesSQL Classes and Interfaces11.2. General-Purpose Actions11.3. Conditional ActionsJSTL Conditional ActionsExposed Class11.4. Iteration ActionsJSTL Iteration ActionsExposed Classes and Interfaces11.5. URL Actions11.6. Internationalization ActionsOverview of JSTL Internationalization ActionsJSTL Internationalization Configuration SettingsFMT_LOCALEFMT_FALLBACK_LOCALEFMT_LOCALIZATION_CONTEXTJSTL Internationalization ActionsExposed Classes11.7. Formatting ActionsOverview of the JSTL Formatting ActionsJSTL Formatting Configuration SettingsJSTL Formatting Actions11.8. Database ActionsOverview of JSTL SQL ActionsJSTL SQL Configuration SettingsJSTL SQL ActionsExposed Classes and Interface11.9. XML Core Actions11.10. XML Flow Control Actions11.11. XML Transform Actions
Setting Up the MySQL Database Used in This Book
A.1. Download and Install MySQLA.2. Download and Install a JDBC Driver for MySQLA.3. Create a MySQL Database for Core JSTL ExamplesA.4. Populate the MySQL Database Used in Core JSTL Examples

Content preview from Core JSTL: Mastering the JSP™ Standard Tag Library

Chapter 4. Iteration Actions

Topics in This Chapter

The <c:forEach> Action
The <c:forTokens> Action
Iteration Status
Custom Iteration Actions

In any programming language, the ability to iterate over a set of values is essential. Before JSTL, JSP did not provide an explicit means to accomplish that fundamental task, so developers had two choices: use a scriptlet or implement a custom action, neither of which is very attractive.

JSTL provides two actions that iterate over a set of values: <c:forEach> and <c:forTokens>. JSTL also exposes an interface and two classes that you can use to implement custom iteration actions: LoopTag, LoopTagSupport, and LoopTagStatus, respectively.^[1] This chapter describes the <c:forEach> and <c:forTokens> actions and shows ...

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Core JSTL: Mastering the JSP™ Standard Tag Library

by David M. Geary

Chapter 4. Iteration Actions

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