jasperreport: how to export into rtf file?

HI!

I am referring to the code suggested in:

http://developers.sun.com/prodtech/javatools/jsenterprise/reference/techart/jse8/jasper_reports.html#2

This is the code:

String reportSource = "./report/templates/HelloReportWorld.jrxml";
String reportDest = "./report/results/HelloReportWorld.html";

Map<String, Object> params = new HashMap<String, Object>();

try
{
    JasperReport jasperReport =
        JasperCompileManager.compileReport(reportSource);

    JasperPrint jasperPrint =
        JasperFillManager.fillReport(
            jasperReport, params, new JREmptyDataSource());

    JasperExportManager.exportReportToHtmlFile(
        jasperPrint, reportDest);

    JasperViewer.viewReport(jasperPrint);
}

catch (JRException ex)
{
    ex.printStackTrace();
}

It work well and I have easily changed it exporting in a PDF file only
substituting "exportReportToHtmlFile" with "exportReportToPdfFile";
unfortunately the JasperExportManager do not have a
"exportReportToRtfFile" and I think that in that case it's necessary
to use in such a way JRRtfExporter and I am unable tu do that.

So, can anyone write me a snipped of code to export instead in a RTF
file?

Thank you in advance,. Franco from Italy