Document Information


Part I Introduction

1.  Overview

2.  Using the Tutorial Examples

Part II The Web Tier

3.  Getting Started with Web Applications

4.  Java Servlet Technology

5.  JavaServer Pages Technology

What Is a JSP Page?

A Simple JSP Page Example

The Example JSP Pages

The Life Cycle of a JSP Page

Translation and Compilation



Handling JSP Page Errors

Creating Static Content

Response and Page Encoding

Creating Dynamic Content

Using Objects within JSP Pages

Using Implicit Objects

Using Application-Specific Objects

Using Shared Objects

Unified Expression Language

Immediate and Deferred Evaluation Syntax

Immediate Evaluation

Deferred Evaluation

Value and Method Expressions

Value Expressions

Method Expressions

Defining a Tag Attribute Type

Deactivating Expression Evaluation

Literal Expressions

Resolving Expressions

Process of Expression Evaluation

EL Resolvers

Implicit Objects


Reserved Words

Examples of EL Expressions


Using Functions

Defining Functions

JavaBeans Components

JavaBeans Component Design Conventions

Creating and Using a JavaBeans Component

Setting JavaBeans Component Properties

Retrieving JavaBeans Component Properties

Using Custom Tags

Declaring Tag Libraries

Including the Tag Library Implementation

Transferring Control to Another Web Component

jsp:param Element

Including an Applet

Setting Properties for Groups of JSP Pages

Deactivating EL Expression Evaluation

Declaring Page Encodings

Defining Implicit Includes

Eliminating Extra White Space

Further Information about JavaServer Pages Technology

6.  JavaServer Pages Documents

7.  JavaServer Pages Standard Tag Library

8.  Custom Tags in JSP Pages

9.  Scripting in JSP Pages

10.  JavaServer Faces Technology

11.  Using JavaServer Faces Technology in JSP Pages

12.  Developing with JavaServer Faces Technology

13.  Creating Custom UI Components

14.  Configuring JavaServer Faces Applications

15.  Internationalizing and Localizing Web Applications

Part III Web Services

16.  Building Web Services with JAX-WS

17.  Binding between XML Schema and Java Classes

18.  Streaming API for XML

19.  SOAP with Attachments API for Java

Part IV Enterprise Beans

20.  Enterprise Beans

21.  Getting Started with Enterprise Beans

22.  Session Bean Examples

23.  A Message-Driven Bean Example

Part V Persistence

24.  Introduction to the Java Persistence API

25.  Persistence in the Web Tier

26.  Persistence in the EJB Tier

27.  The Java Persistence Query Language

Part VI Services

28.  Introduction to Security in the Java EE Platform

29.  Securing Java EE Applications

30.  Securing Web Applications

31.  The Java Message Service API

32.  Java EE Examples Using the JMS API

33.  Transactions

34.  Resource Connections

35.  Connector Architecture

Part VII Case Studies

36.  The Coffee Break Application

37.  The Duke's Bank Application

Part VIII Appendixes

A.  Java Encoding Schemes

B.  About the Authors



Reusing Content in JSP Pages

There are many mechanisms for reusing JSP content in a JSP page. Three mechanisms that can be categorized as direct reuse are discussed here:

  • The include directive

  • Preludes and codas

  • The jsp:include element

An indirect method of content reuse occurs when a tag file is used to define a custom tag that is used by many web applications. Tag files are discussed in the section Encapsulating Reusable Content Using Tag Files in Chapter 8, Custom Tags in JSP Pages.

The include directive is processed when the JSP page is translated into a servlet class. The effect of the directive is to insert the text contained in another file (either static content or another JSP page) into the including JSP page. You would probably use the include directive to include banner content, copyright information, or any chunk of content that you might want to reuse in another page. The syntax for the include directive is as follows:

<%@ include file="filename" %>

For example, all the Duke’s Bookstore application pages could include the file banner.jspf, which contains the banner content, by using the following directive:

<%@ include file="banner.jspf" %>

Another way to do a static include is to use the prelude and coda mechanisms described in Defining Implicit Includes. This is the approach used by the Duke’s Bookstore application.

Because you must put an include directive in each file that reuses the resource referenced by the directive, this approach has its limitations. Preludes and codas can be applied only to the beginnings and ends of pages. For a more flexible approach to building pages out of content chunks, see A Template Tag Library.

The jsp:include element is processed when a JSP page is executed. The include action allows you to include either a static or a dynamic resource in a JSP file. The results of including static and dynamic resources are quite different. If the resource is static, its content is inserted into the calling JSP file. If the resource is dynamic, the request is sent to the included resource, the included page is executed, and then the result is included in the response from the calling JSP page. The syntax for the jsp:include element is:

<jsp:include page="includedPage" />

The hello1 application discussed in Packaging Web Modules uses the following statement to include the page that generates the response:

<jsp:include page="response.jsp"/>