apache poi apply one style to different workbooks

Question

I\'m trying to apply one cell style to defferent woekbooks. It works well, when I apply it to first workbook, but when I\'m trying to do this with second and next workbooks - no

Answer 1

You can't do that, CellStyle objects are specific to one workbook. They're quite deep objects, and much of the style is held in the workbook, so you can't just re-use. You even get a helpful exception which explains this to you!

What you need to do instead is to use the cloneStyleFrom(CellStyle) method, to copy the details of the style over. Something like:

Workbook wb = WorkbookFactory.create(new File("existing.xls"));
CellStyle origStyle = wb.getCellStyleAt(1); // Or from a cell

Workbook newWB = new XSSFWorkbook();
Sheet sheet = newWB.createSheet();
Row r1 = sheet.createRow(0);
Cell c1 = r1.createCell(0);

CellStyle newStyle = newWB.createCellStyle();
newStyle.cloneStyleFrom(origStyle);
c1.setCellStyle(newStyle);

newWB.write(new FileOutpuStream("new.xlsx"));