POI Excel CellStyle Arayüzü

setDataFormat metodu
Örnek
Şöyle yaparız.

CellStyle doubleStyle = workbook.createCellStyle();
doubleStyle.setDataFormat(workbook.createDataFormat().getFormat("#,##0.#######"));

Örnek
Şöyle yaparız.

CellStyle style = wb.createCellStyle(); 

CreationHelper createHelper = wb.getCreationHelper(); 
short dateFormat = createHelper.createDataFormat().getFormat("yyyy-MM-dd-hh.mm.ss"); 
style.setDataFormat(dateFormat);