}
public void exportToPDF(JSONObject worksheetJSON, OutputStream outputStream) throws Exception {
WorkSheetPDFExporter exporter = new WorkSheetPDFExporter();
exporter.open(outputStream);
exporter.setNumberFormat(numberFormat);
exporter.setUserDateFormat(userDateFormat);
int sheetsNumber = worksheetJSON.getInt(SHEETS_NUM);
JSONArray exportedSheets = worksheetJSON.getJSONArray(EXPORTED_SHEETS);