You need to have a web.xml file. It describes the mapping between the
taglib
uri and the location of the Tag Library Descriptor.
Your web.xml file could look like this:
====
<?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>
Core servlets example tag library
</description>
<taglib>
<taglib-uri>
csajsp-taglib.tld
</taglib-uri>
<taglib-location>
/WEB-INF/csajsp-taglib.tld
</taglib-location>
</taglib>
</web-app>
====
In your case, you would place the file in the following location:
jakarta-tomcat/webapps/ROOT/WEB-INF/web.xml
The following files should be in these locations:
jakarta-tomcat/webapps/ROOT/WEB-INF/csajsp-taglib.tld
jakarta-tomcat/webapps/ROOT/SimpleExample.jsp
Justyna
< [EMAIL PROTECTED] >
jie li wrote:
>
> Hello Everyone,
> Please help me to create a customized tag in JSP. In
> fact this example is from the book of "core servlets
> and jsp".
>
> web server is jakarta-tomcat 3.1
> JSP 1.1
>
> the tag handler class resides in
> jakarta-tomcat/webapps/ROOT/WEB-INF/classes/coreservlets/tags/ExampleTag.class
>
> the TLD file and .jsp resides in
> jakarta-tomcat/webapps/csajsp-taglib.tld
> jakarta-tomcat/webapps/SimpleExample.jsp
>
> when I run http://localhost:8080/SimpleExample.jsp
>
> the title is still <csajsp:example />. it didn't be
> resolved to the customized tag. It looks like tomcat
> can't recognize the customized tag. What's wrong here?
>
> attachment the souce code:
> =========================================
> the handler java file ExampleTag.java
> =========================================
> package coreservlets.tags;
> import javax.servlet.jsp.*;
> import javax.servlet.jsp.tagext.*;
> import java.io.*;
> /** Very simple JSP tag that just inserts a string
> * ("Custom tag example...") into the output.
> * The actual name of the tag is not defined here;
> * that is given by the Tag Library Descriptor (TLD)
> * file that is referenced by the taglib directive
> * in the JSP file.
> */
> public class ExampleTag extends TagSupport {
> public int doStartTag() {
> try {
> JspWriter out = pageContext.getOut();
> out.print("Custom tag example " +
> "(coreservlets.tags.ExampleTag)");
> } catch(IOException ioe) {
> System.out.println("Error in ExampleTag: " + ioe);
> }
> return(SKIP_BODY);
> }
> }
>
> ========================
> csajsp-taglib.tld:
> ========================
> <?xml version="1.0" encoding="ISO-8859-1" ?>
> <!DOCTYPE taglib
> PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library
> 1.1//EN"
> "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">
> <!-- a tag library descriptor -->
> <taglib>
> <!-- after this the default space is
> "http://java.sun.com/j2ee/dtds/jsptaglibrary_1_2.dtd"
> -->
> <tlibversion>1.0</tlibversion>
> <jspversion>1.1</jspversion>
> <shortname>csajsp</shortname>
> <urn></urn>
> <info>
> A tag library from Core Servlets and JavaServer Pages,
> http://www.coreservlets.com/.
> </info>
> <tag>
> <name>example</name>
> <tagclass>coreservlets.tags.ExampleTag</tagclass>
> <info>Simplest example: inserts one line of
> output</info>
> <bodycontent>EMPTY</bodycontent>
> </tag>
> <!-- Other tags defined later... -->
> </taglib>
> ========================
> SimpleExample.jsp
> ========================
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0
> Transitional//EN">
> <HTML>
> <HEAD>
> I am testing tag
> <%@ taglib uri="csajsp-taglib.tld" prefix="csajsp" %>
> <TITLE><csajsp:example /></TITLE>
> <!--LINK REL=STYLESHEET HREF="JSP-Styles.css"
> TYPE="text/css"-->
> </HEAD>
> <BODY>
> This is testing tag
> <H1><csajsp:example /></H1>
> <csajsp:example />
> </BODY>
> </HTML>
>
> Thanks a lot!
> Jie
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