JSP: custom tag to modify its body

This is a skeleton of what is needed to build a custom jsp tag which does something to its body. For example a tag could change the urls of all the links found in its body.

<br />package com.mycompany.package.of.the.tag;<br /><br />import javax.servlet.jsp.JspException;<br />import javax.servlet.jsp.JspWriter;<br />import javax.servlet.jsp.tagext.BodyContent;<br />import javax.servlet.jsp.tagext.BodyTagSupport;<br /><br />public class CustomTag extends BodyTagSupport {<br />private static final long serialVersionUID = 1L;<br /><br />public int doAfterBody() throws JspException {<br /> try {<br /> BodyContent bc = getBodyContent();<br /> String body = bc.getString();<br /> // do something to the body here.<br /> JspWriter out = bc.getEnclosingWriter();<br /> if(body != null) {<br /> out.print(buff.toString());<br /> }<br /> } catch(IOException ioe) {<br /> throw new JspException("Error: "+ioe.getMessage());<br /> }<br /> return EVAL_BODY_INCLUDE;<br /> }<br />}<br />

make a file called CustomTag.tld and put it into WEB-INF:
<br /><?xml version = "1.0" encoding = "ISO-8859-1" ?><br /><!DOCTYPE taglib<br />PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN"<br />"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1,dtd"><br /><taglib><br /><tlibversion>1.0</tlibversion><br /><jspversion>1.1</jspversion><br /><uri>com.mycompany.CustomTag</uri><br /><shortname>Custom Tag</shortname><br /><tag><br /><name>ct</name><br /><tagclass>com.mycompany.package.of.the.tag.CustomTag</tagclass><br /><bodycontent>JSP</bodycontent><br /></tag><br /></taglib><br /><br />

use it like this on your JSP:
<%@ taglib uri="com.mycompany.CustomTag" prefix="x"%>

<x:ct>
here is some stuff inside the tag!
<c:out value="${someparam}"/>
</x:ct>