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首页JSTL 1.1预发布版：Java服务器页面标准标签库教程

JSTL 1.1预发布版：Java服务器页面标准标签库教程

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JSTL (JavaServer Pages Standard Tag Library) 是由Sun Microsystems公司开发的一个强大的Java技术，旨在简化服务器端编程，特别是对于Java Server Pages (JSP) 开发者来说。这份英文版的帮助手册版本为1.1 Pre-FCS，发布于2003年6月16日，由Pierre Delisle编辑，适用于Java Server Pages Standard Tag Library 1.1规格。该文档是JSTL规格的详细说明，涵盖了库的各个组成部分，包括标签库的标准元素（如c:forEach、c:out、c:choose等），这些标签提供了一种结构化的编程方式，使得在JSP页面上进行条件判断、循环操作以及数据绑定变得更加直观和高效。例如，c:forEach用于迭代集合，c:out用于输出变量值，c:choose则用于根据条件执行不同的代码块。 JSTL版本1.1 Pre-FCS是一个维护版，意味着它可能包含了修复过的错误、性能优化和功能增强。版权方面，所有内容受Sun Microsystems及其可能的许可人保护，未经Sun的书面授权，禁止任何形式的复制或使用，除非按照协议条款进行。这意味着开发者在使用JSTL时必须遵循相应的许可协议，尊重知识产权。这份帮助手册提供了丰富的API文档和示例，使得开发者能够快速理解和掌握如何在JSP项目中集成和使用JSTL。它不仅有助于提升开发效率，还能帮助开发者避免潜在的陷阱和最佳实践建议。如果你是一名JSP开发者，无论是初学者还是经验丰富的专业人士，这本手册都是不可或缺的学习资源。通过阅读和理解JSTL帮助手册，你将能更好地利用Java平台的这一强大工具，简化服务器端的编程任务，实现动态网页的高效构建。学习和掌握JSTL不仅可以提升个人技能，还能推动项目的成功实施。

xiv JSTL 1.1 • July 2003

CHAPTER

Introduction

This is the JavaServer Pages™ Standard Tag Library 1.1 (JSTL 1.1) specification,

developed by the JSR-52 expert group under the Java Community Process (http://

www.jcp.org).

1.1 Goals

The ultimate goal of JSTL is to help simplify JavaServer™ Pages (JSP™) page

authors’ lives.

A page author is someone who is responsible for the design of a web application’s

presentation layer using JSP pages. Many page authors are not fluent in any

programming language.

One of the main difficulties a page author is faced with is the need to use a scripting

language (the default being the Java programming language) to manipulate the

dynamic data within a JSP page. Unfortunately, page authors often see scripting

languages as complex and not very well adapted to their needs.

JSTL offers the following capabilities:

■ Expression language support actions

These actions allow a page author to easily display expressions in the expression

language, as well as to easily set the value of JSP scoped attributes.

■ Control flow actions

Tag-based control flow structures (conditionals, iterators), which are more natural

to page authors.

■ Tag library validators (TLVs)

TLVs allow projects to only allow specific tag libraries, as well as enforce JSP

coding styles that are free of scripting elements.

2 JSTL 1.1 • July 2003

The other key aspect of JSTL is that it provides standard actions and standard EL

functions for functionality most often needed by page authors. These cover the

following topics:

■ Accessing URL-based resources

■ Internationalization (i18n) and text formatting

■ Relational database access (SQL)

■ XML processing

■ String manipulation

1.2 Multiple Tag Libraries

A tag library is a collection of actions that encapsulates functionality to be used from

within a JSP page. JSTL includes a wide variety of actions that naturally fit into

discrete functional areas. This is why JSTL, although referred to as the standard tag

library (singular), is exposed via multiple tag libraries to clearly identify the

functional areas it covers, as well as to give each area its own namespace. The tables

below lists these functional areas along with the URIs used to reference the libraries.

The tables also show the prefixes used in this specification (although page authors

are free to use any prefix they want).

JSTL Tag Libraries

1.3 Container Requirement

JSTL 1.1 requires a JSP 2.0 web container. Please note that the Expression Language

is part of the JSP specification starting with JSP 2.0.

Functional Area URI Prefix

core

http://java.sun.com/jsp/jstl/core c

XML processing

http://java.sun.com/jsp/jstl/xml x

I18N capable formatting

http://java.sun.com/jsp/jstl/fmt fmt

relational db access

(SQL)

http://java.sun.com/jsp/jstl/sql sql

Functions

http://java.sun.com/jsp/jstl/functions fn

CHAPTER

Conventions

This chapter describes the conventions used in this specification.

2.1 How Actions are Documented

JSTL actions are grouped according to their functionality. These functional groups of

actions are documented in their own chapter using the following structure:

■ Motivation

Describes the motivation for standardizing the actions.

■ Overview

Provides an overview of the capabilities provided by the actions. Sample code

featuring these actions in their most common use cases is also provided.

■ One section per action, with the following structure:

■ Name

Tag library prefixes are used in this specification for all references to JSTL

actions (e.g.: <c:if> instead of <if>).

■ Short Description

■ Syntax

The syntax notation is described in Section 2.1.2.

■ Body Content

This section specifies which type of body content is supported by the action.

As defined by the JSP specification, the body content type can be one of empty,

JSP,ortagdependent. The section also specifies if the body content is

processed by the action or is simply ignored by the action and just written to

the current JspWriter. If the body content is processed, information is given

on whether or not the body content is trimmed before the action begins

processing it.

■ Attributes

4 JSTL 1.1 • July 2003

Details in Section 2.1.1 below.

■ Constraints

List of additional constraints enforced by the action.

■ Null & Error Handling

Details on how null and empty values are processed, as well as on exceptions

thrown by the action.

■ Description

This section provides more details on the action.

■ Other sections

Other sections related to the group of actions described in the chapter may exist.

These include sections on interfaces and classes exposed by these actions.

2.1.1 Attributes

For each attribute, the following information is given: name, dynamic behavior, type,

and description.

The rtexprvalue element defined in a TLD is covered in this specification with the

column titled “Dynamic” that captures the dynamic behavior of an attribute. The

value can be either true or false. A false value in the dynamic column means that

only a static string value can be specified for the attribute. A true value means that a

request-time attribute value can be specified. As defined in the JSP specification, a

“request-time attribute value” can be either a Java expression, an EL expression, or a

value set by a <jsp:attribute>.

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JSTL 1.1预发布版：Java服务器页面标准标签库教程

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jakarta.servlet.jsp.jstl-api-2.0.0.jar

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jstl-quick-reference.pdf

JSTL循环显示的用法.pdf

JSTL中英文对照版.chm

JAVAEE实验报告EL表达式和jstl标签库的使用.pdf

JSTL标签参考手册.pdf

学习JSTL标签参考手册.pdf

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