I don\'t know why the file I write using POI cant be opened by Ms Excel 2013, but the file is still readable by POI. (cell value can be changed)
this is the error fr
The major problem that i see here is:
Workbook workbook = null; workbook = new HSSFWorkbook(fis);
Instead you have to use:
Workbook workbook = null; workbook = new XSSFWorkbook(fis);
TO be readable by MS EXCEL 2013.