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Header Tag:
Posted on: January 10, 2008 at 12:00 AM

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

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.

Name	Description
id	This attribute specifies the name of the scripting variable (and associated page scope attribute) that will be made available with the value of the specified request header.
multiple	If any arbitrary value for this attribute is specified, causes a call to `HttpServletRequest.getHeaders()` and a definition of the result as a bean of type `String[]`. Otherwise, `HttpServletRequest.getHeader()` will be called, and a definition of the result as a bean of type `String` will be performed.
name	This attribute specifies the name of the request header whose value, or values, is to be retrieved.
value	The default header value to return if no header with the specified name was included in this request.

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 .

Output:

Above actions displays the working of beanHeaderTag..

Related Tags for Header Tag::
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