Facet header support for sheet names on XLS DataExporter

[mertsincan]

You can use text in dataTable's facet header for sheet names. Default sheet name is datatable's id or datatable's clientId (with repeate attribute)

Exp;

<p:dataTable id="Table" var="car" value="#{tab.tabCars}">
    <f:facet name="header">
           <h:outputText value="Test" />
    </f:facet>
...
</dataTable>

Sheet name is "Test" on excel.