Java Reference
In-Depth Information
The taglib Directive
The most recent version of the JSP specification defines a mechanism for extending the current
set of JSP tags. It does this by creating a custom set of tags called a tag library . That is what
the taglib points to. The taglib directive declares that the page uses custom tags, uniquely
names the tag library defining them, and associates a tag prefix that will distinguish usage of
those tags. The syntax of the taglib directive is as follows:
<%@ taglib uri=” tagLibraryURI ” prefix=” tagPrefix ” %>
The taglib attributes are described in Table 14.2.
T ABLE 14.2
The Attributes for the taglib Directive
This attribute references a URI that uniquely names the set of custom tags.
This attribute defines the prefix string used to distinguish a custom tag
Standard Actions
JSP standard actions provide an abstraction that can be used to easily encapsulate common
tasks. They typically create or act on objects, normally JavaBeans. The JSP technology pro-
vides some standard actions. These actions are briefly defined in the following list; we'll
explore them in more detail in Chapter 16, “JSP Standard Actions”:
<jsp:useBean> The <jsp:useBean> action associates an instance of a JavaBean
defined with a given scope and ID, using a newly declared scripting variable of the same
<jsp:setProperty> The <jsp:setProperty> action sets the value of a bean's
<jsp:getProperty> The <jsp:getProperty> action takes the value of the referenced
bean instance's property, converts it to a java.lang.String , and places it into the
implicit out object.
<jsp:include> The <jsp:include> action provides a mechanism for including addi-
tional static and dynamic resources in the current JSP page.
<jsp:forward> The <jsp:forward> action enables the JSP engine to dispatch, at run-
time, the current request to a static resource, servlet, or another JSP.
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