GetCertAndPrivateKeyFromPFX certAndPrivateKeyFromPFX=new GetCertAndPrivateKeyFromPFX();
HashMap<X509Certificate,PrivateKey> hashMap=certAndPrivateKeyFromPFX.getCertAndPrivateKeyFromPFX(inputFile_pfx);
IDigitalSignatures dsc = workbook.addDigitalSignature(hashMap.keySet().iterator().next(), hashMap.get(hashMap.keySet().iterator().next()), "e-iceblue", calendar.getTime());
workbook.isDigitallySigned();
workbook.removeAllDigitalSignatures();

//Group
Workbook wb = new Workbook();
wb.loadFromFile(inputFile);
Worksheet sheet = wb.getWorksheets().get("Sheet1");
XlsPivotTable pt = (XlsPivotTable)sheet.getPivotTables().get(0);
PivotField r1 = (PivotField)pt.getPivotFields().get("Count");
pt.setManualGroupField(r1,7,15, EnumSet.of(PivotGroupByType.RangeOfValues),5);
wb.saveToFile(outputFile, ExcelVersion.Version2013);
wb.dispose();
//Ungroup
Workbook wb = new Workbook();
wb.loadFromFile(inputFile);
Worksheet sheet = wb.getWorksheets().get("Sheet1");
XlsPivotTable pt = (XlsPivotTable)sheet.getPivotTables().get(0);
PivotField r1 = (PivotField)pt.getPivotFields().get("Count");
pt.setUngroup(r1);
wb.saveToFile(outputFile, ExcelVersion.Version2013);
wb.dispose();