MyTag.java
package taglib;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.io.IOException;
public class MyTag extends TagSupport
{
public int doStartTag() throws JspException
{
return EVAL_BODY_INCLUDE;
}
public int doAfterBody() throws JspException
{
System.out.println("Hello!");
return SKIP_BODY;
}
}
MyTag.tld
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.tld">
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>taglib1</short-name>
<uri>http://java2s.com/taglibs</uri>
<description>
A simple tag library
</description>
<!-- log tag -->
<tag>
<name>log</name>
<tag-class>taglib.MyTag</tag-class>
<body-content>TAGDEPENDENT</body-content>
<description>
Log a message.
</description>
</tag>
</taglib>
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
<description>
Example web application illustrating the use of tags in the
"request" custom tag library, from the JAKARTA-TAGLIBS project.
</description>
<taglib>
<taglib-uri>http://java2s.com/taglibs</taglib-uri>
<taglib-location>/WEB-INF/MyTag.tld</taglib-location>
</taglib>
<security-role>
<role-name>admin</role-name>
</security-role>
</web-app>
Jsp page with custom tag
<%@ taglib uri="http://java2s.com/taglibs" prefix="l"%>
<HTML>
<HEAD>
<TITLE>Creating a Simple Custom Tag</TITLE>
</HEAD>
<BODY>
<H1>Creating a Simple Custom Tag</H1>
<l:log>
I'm sending some text to the server console!
</l:log>
</BODY>
</HTML>
Download: CustomTagForOutputMessgeToConsole.zip( 135 k)