public int setCellValue(int sheet, int RowIndex, int CellIndex, String value) {
   if (FileType.getFileType() == 1) {
     excel_xls.setCellValue(sheet, RowIndex, CellIndex, value);
   } else if (FileType.getFileType() == 2) {
     excel_xlsx.setCellValue(sheet, RowIndex, CellIndex, value);
   }
   return -1;
 }