private void cargarPropiedadesReporte(JRXlsExporter exporter) {
   SimpleXlsReportConfiguration configuracionExcel = new SimpleXlsReportConfiguration();
   configuracionExcel.setDetectCellType(Boolean.TRUE);
   configuracionExcel.setOnePagePerSheet(Boolean.FALSE);
   configuracionExcel.setWhitePageBackground(Boolean.FALSE);
   configuracionExcel.setRemoveEmptySpaceBetweenColumns(Boolean.TRUE);
   configuracionExcel.setRemoveEmptySpaceBetweenRows(Boolean.TRUE);
   configuracionExcel.setIgnoreCellBorder(Boolean.FALSE);
   exporter.setConfiguration(configuracionExcel);
 }
  public void xls() throws JRException {
    long start = System.currentTimeMillis();
    File sourceFile = new File("build/reports/JRMDbReport.jrprint");

    JasperPrint jasperPrint = (JasperPrint) JRLoader.loadObject(sourceFile);

    File destFile = new File(sourceFile.getParent(), jasperPrint.getName() + ".xls");

    JRXlsExporter exporter = new JRXlsExporter();

    exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
    exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(destFile));
    SimpleXlsReportConfiguration configuration = new SimpleXlsReportConfiguration();
    configuration.setOnePagePerSheet(false);
    exporter.setConfiguration(configuration);

    exporter.exportReport();

    System.err.println("XLS creation time : " + (System.currentTimeMillis() - start));
  }
  public void xls() throws JRException {
    long start = System.currentTimeMillis();
    File sourceFile = new File(TMP_DIR + ALL_CHARTS_REPORT_JRPRINT);
    Map<String, String> dateFormats = new HashMap<String, String>();
    dateFormats.put("EEE, MMM d, yyyy", "ddd, mmm d, yyyy");
    JasperPrint jasperPrint = (JasperPrint) JRLoader.loadObject(sourceFile);
    File destFile = new File(sourceFile.getParent(), jasperPrint.getName() + ".xls");

    JRXlsExporter exporter = new JRXlsExporter();

    exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
    exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(destFile));
    SimpleXlsReportConfiguration configuration = new SimpleXlsReportConfiguration();
    configuration.setOnePagePerSheet(true);
    configuration.setDetectCellType(true);
    configuration.setFormatPatternsMap(dateFormats);
    exporter.setConfiguration(configuration);

    exporter.exportReport();

    System.err.println("XLS creation time : " + (System.currentTimeMillis() - start));
  }