Salvar informações em excel com Netbeans

Fiz um botão “Exportar”, quando clicar o action do botão é

private void btnExportarActionPerformed(java.awt.event.ActionEvent evt) {

FileOutputStream excelFOU = null;

BufferedOutputStream excelBOU = null;

XSSFWorkbook excelJTableExporter = null;

JFileChooser excelFileChooser = new JFileChooser("C:\\Users\\Iora\\Desktop");

    excelFileChooser.setDialogTitle("Salvar Como");
    FileNameExtensionFilter fnef = new FileNameExtensionFilter("EXCEL FILES", "xls", "xlsx", "xlsm");
    excelFileChooser.setFileFilter(fnef);
    int excelChooser = excelFileChooser.showSaveDialog(null);

    //Verifica se o botão salvar foi clicado
    if (excelChooser == JFileChooser.APPROVE_OPTION) {

        try {
            excelJTableExporter = new XSSFWorkbook();
            XSSFSheet excelSheet = excelJTableExporter.createSheet("JTable Sheet");
            for (int i = 0; i < tblExcel.getRowCount(); i++) {
                XSSFRow excelRow = excelSheet.createRow(i);

                for (int j = 0; j < tblExcel.getColumnCount(); j++) {
                    XSSFCell excelCell = excelRow.createCell(j);

                    excelCell.setCellValue(tblExcel.getValueAt(i, j).toString());

                }

            }
            excelFOU = new FileOutputStream(excelFileChooser.getSelectedFile() + ".xlsx");
            excelBOU = new BufferedOutputStream(excelFOU);
            excelJTableExporter.write(excelBOU);
            JOptionPane.showMessageDialog(null, "Exportado com Sucesso");
        } catch (FileNotFoundException ex) {
            ex.printStackTrace();
        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            try {
                if (excelBOU != null) {
                    excelBOU.close();
                }

                if (excelFOU != null) {
                    excelFOU.close();
                }
                if (excelJTableExporter != null) {
                    excelJTableExporter.close();
                }

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

}