Jsp output

I have problem in export the footer and caption tag when exporting all the data from a table to excel and pdf..
the below is my coding;


<display:table name="${searchFixReportInfo}" id="row" class="dataTable" requestURI="" pagesize="20" style="width: 100%" export="true" >

<display:caption media="html">
<strong>A Caption</strong>
</display:caption>

<display:caption media="excel pdf">A Caption</display:caption>
<display:footer media="html">

<tr>
<td colspan="5"><strong>Sample footer</strong></td>
</tr>
</display:footer>
<display:footer media="excel pdf" >Sample footer</display:footer>

<display:setProperty name="export.excel" value="true" />
<display:setProperty name="export.excel.class" value="org.displaytag.export.excel.DefaultHssfExportView " />
<display:setProperty name="export.excel.filename" value="data.xls" />

<display:setProperty name="export.pdf.class" value="org.displaytag.export.DefaultPdfExportView " />
<display:setProperty name="export.pdf" value="true" />
<display:setProperty name="export.pdf.filename" value="data.pdf" />

</display:table>

 

in HTML view, but not in pdf and excel