| 23. 58. 6. Custom Tag Web XML Tag Lib |
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HelloWorld.java |
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package beans;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.util.*;
public class HelloWorld extends TagSupport
{
public int doStartTag() throws JspException
{
try
{
JspWriter out = pageContext.getOut();
HttpServletResponse response = (HttpServletResponse)pageContext.getResponse();
out.write("Hello world!");
}
catch(Exception e)
{
throw new JspException(e.getMessage());
}
return EVAL_PAGE;
}
}
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simple.tld |
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<!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>Simple Tags</short-name>
<tag>
<name>HelloWorld</name>
<tag-class>beans.HelloWorld</tag-class>
<body-content>empty</body-content>
</tag>
</taglib>
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web.xml |
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<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<taglib>
<taglib-uri>
http://www.java2java.com/custom
</taglib-uri>
<taglib-location>
/WEB-INF/tags/simple.tld
</taglib-location>
</taglib>
<context-param>
<param-name>javax.servlet.jsp.jstl.fmt.timeZone</param-name>
<param-value>US/Central</param-value>
</context-param>
<context-param>
<param-name>database-driver</param-name>
<param-value>org.gjt.mm.mysql.Driver</param-value>
</context-param>
<context-param>
<param-name>database-url</param-name>
<param-value>
jdbc:mysql://localhost/forum?user=forumuser</param-value>
</context-param>
<taglib>
<taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri>
<taglib-location>/WEB-INF/fmt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/fmt-rt</taglib-uri>
<taglib-location>/WEB-INF/fmt-rt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/c.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/core-rt</taglib-uri>
<taglib-location>/WEB-INF/c-rt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/sql</taglib-uri>
<taglib-location>/WEB-INF/sql.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/sql-rt</taglib-uri>
<taglib-location>/WEB-INF/sql-rt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/x</taglib-uri>
<taglib-location>/WEB-INF/x.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>http://java.sun.com/jstl/x-rt</taglib-uri>
<taglib-location>/WEB-INF/x-rt.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>
http://java.jeffheaton.com/taglib/jstl/forum</taglib-uri>
<taglib-location>/WEB-INF/forum.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/tlt</taglib-uri>
<taglib-location>/WEB-INF/taglib.tld</taglib-location>
</taglib>
</web-app>
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Jsp page with custom tag |
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<%@ taglib uri='http://www.java2java.com/custom' prefix='hw' %>
<html>
<body>
<hw:HelloWorld />
</body>
</html>
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 Download: CustomTagWebXMLTagLib.zip( 1,067 k) |