An Iteration Tag

Iteration Tag extends the Tag interface and adds one more method for supporting iterations:doAfterBody().

import javax.servlet.jsp.JspException;
public interface IterationTag
extends Tag {
public static final int EVAL_BODY_AGAIN=2;
public abstract int doAfterBody()throws JspException;


By moving the flow control logic to tag handlers, flow control tags reduce the amount of scripting needed in JSP pages. Iteration is a very common flow control function and is easily handled by a custom tag.
The tag retrieves objects from a collection stored in a JavaBeans component and assigns them to an EL variable. The body of the tag retrieves information from the variable. As long as elements remain in the collection, the iterator tag causes the body to be reevaluated. The tag in this example is simplified to make it easy to demonstrate how to program a custom tag.

JSP Page

The index.jsp page invokes the iterator tag to iterate through a collection of department names. Each item in the collection is assigned to the departmentName variable.

<%@ taglib uri="/tlt" prefix="tlt" %><html>
    <body bgcolor="white">
    <jsp:useBean id="myorg" class="myorg.Organization"/>
    <table border=2 cellspacing=3 cellpadding=3>
    <tlt:iterator var="departmentName" type="java.lang.String"
            <td><a href="list.jsp?deptName=${departmentName}">

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