3.Getting Started with Web Applications
7.JavaServer Pages Standard Tag Library
Dynamic Attribute or Deferred Expression
Encapsulating Reusable Content Using Tag Files
Declaring Tag Attributes in Tag Files
Declaring Tag Variables in Tag Files
Evaluating Fragments Passed to Tag Files
Simple and Fragment Attribute and Variable Example
Top-Level Tag Library Descriptor Elements
Declaring Tag Attributes for Tag Handlers
Declaring Tag Variables for Tag Handlers
Including Tag Handlers in Web Applications
How Is a Simple Tag Handler Invoked?
Tag Handlers for Tags with Attributes
Defining Attributes in a Tag Handler
Setting Deferred Value Attributes and Deferred Method Attributes
Tag Handler Does Not Manipulate the Body
Tag Handlers for Tags That Define Variables
11.Using JavaServer Faces Technology in JSP Pages
12.Developing with JavaServer Faces Technology
16.Building Web Services with JAX-WS
17.Binding between XML Schema and Java Classes
19.SOAP with Attachments API for Java
21.Getting Started with Enterprise Beans
24.Introduction to the Java Persistence API
27.The Java Persistence Query Language
28.Introduction to Security in the Java EE Platform
32.Java EE Examples Using the JMS API
custom tags, which are extensions to the JSP language. Some examples of tasks that can be performed by custom tags include operating on implicit objects, processing forms, accessing databases and other enterprise services such as email and directories, and implementing flow control. Custom tags increase productivity because they can be reused in more than one application.
tag library, which defines a set of related custom tags and contains the objects that implement the tags. The object that implements a custom tag is called atag handler. JSP technology defines two types of tag handlers: simple and classic.Simpletag handlers can be used only for tags that do not use scripting elements in attribute values or the tag body.Classictag handlers must be used if scripting elements are required. Simple tag handlers are covered in this chapter, and classic tag handlers are discussed inChapter9, Scripting in JSP Pages.
tag fileis a source file containing a reusable fragment of JSP code that is translated into a simple tag handler by the web container. Tag files can be used to develop custom tags that are presentation-centric or that can take advantage of existing tag libraries, or by page authors who do not know Java. When the flexibility of the Java programming language is needed to define the tag, JSP technology provides a simple API for developing a tag handler in the Java programming language.
This chapter assumes that you are familiar with the material inChapter5, JavaServer Pages Technology, especially the sectionUsing Custom Tags. For more information about tag libraries and for pointers to some freely available libraries, see