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| A custom tag that has neither attributes nor body content. |
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/// Empty Tag
<!-- this must be added to the web application's web.xml -->
<taglib>
<taglib-uri>/java2s</taglib-uri>
<taglib-location>/WEB-INF/java2s.tld</taglib-location>
</taglib>
// create File:java2s.tld in the /WEB-INF/
<!DOCTYPE taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<!-- a tab library descriptor -->
<taglib xmlns="http://java.sun.com/JSP/TagLibraryDescriptor">
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>Java2s Simple Tags</short-name>
<!-- this tag just outputs some text -->
<tag>
<name>emptyTag</name>
<tag-class>com.java2s.EmptyTag</tag-class>
<body-content>empty</body-content>
</tag>
</taglib>
//compile the following code into WEB-INF\classes\com\java2s
package com.java2s;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
public class EmptyTag extends TagSupport
{
public int doStartTag() throws JspException
{
try
{
pageContext.getOut().print("in EmptyTag.doStartTag()");
}
catch (IOException e)
{
System.out.println("Error in EmptyTag.doStartTag()");
e.printStackTrace();
throw new JspException(e); // throw the error to the error page (if set)
} // end of try-catch
return SKIP_BODY;
}
}
// start comcat and load the following jsp page in browser
<%@ taglib uri="/java2s" prefix="java2s" %>
<html>
<head>
<title>A custom tag: empty</title>
</head>
<body>
This page uses a custom tag that has neither attributes nor body content.
Here is its output:
<h1><java2s:emptyTag /></h1>
</body>
</html>
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