Header Tag :

bean:header Tag - is used to define a scripting variable based on the value(s) of the specified request header.

This tag retrieve the value of the specified request header (may be a single or multiple values), and define the result as a page scope attribute of type String or String[].

If no header with the specified name can be located, and no default value is specified, a request time exception will be thrown.

Example Illustrating the use of the Header<bean:header> tag.
Here you will learn to use the Struts Html bean:header tags.
We will cover an example that will show a working of<bean:header> tags

Example code :
Creating an Action Class : Not Required here.

Creating Form Bean : Not Required here.
Defining the global-forwards : Not Required here.
Developing the Action Mapping in the struts-config.xml :Not Required here.

Developing the beanHeaderTag.jsp page


<%@page contentType="text/html"%>

<%@page pageEncoding="UTF-8"%>

<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %>

<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %>

<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

"http://www.w3.org/TR/html4/loose.dtd">

<html>

    <head>

        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

    </head>

    <body bgcolor="#999933">

        <h3><font color="#33FF33">Bean Header Tag Demo</font></h3>

        

        <table border="2">

            <tr>

                <th><font color="#33FF33">Headers Name</font></th>

                <th><font color="#33FF33">Headeres Value</font></th>

            </tr>

            

            <%

           java.util.Enumeration e =((HttpServletRequest)request).getHeaderNames();

            

            while(e.hasMoreElements()){

                String headerName =(String)e.nextElement();

            %>            

            <bean:header id="header" name="<%= headerName %>"/>            

            <tr>

                <td><%=headerName%></td>

                <td><%=header%></td>                

            </tr>           

            <%

            }            

            %>            

        </table>      

    </body>

</html>

Add the following line in the index.jsp to call the form.


<a href="beanHeaderTag.jsp">beanHeaderTagDemo</a><br/>

Building and Testing the Example
Build , deploy and Test the application .
Open the browser and navigate to the beanHeaderTag.jsp page
Your browser displays the following page beanHeaderTag.jsp and see the O/P .

Header Tag: