Error creating cell with POI

问题:

I do an export from Java to xls, i use POI library.

My createCell Method:

private Cell createCell(Row ligne, int col, String value, CellStyle style, HSSFWorkbook classeur) {        
    //org.apache.poi.hssf.usermodel.HSSFOptimiser.optimiseCellStyles(classeur);
    CellStyle styleCell = classeur.createCellStyle();
    styleCell.cloneStyleFrom(style);
    return createCell(ligne, col, value, styleCell);
}


protected Cell createCell(Row ligne, int col, String value, CellStyle style) {
    Cell cell = createCell(ligne, col, value);
    cell.setCellStyle(style);
    return cell;
}

i call this methods in a For, i have this message error:

Echec de l'export: The maximum number of cell styles was exceeded. You can define up to 4000 styles in a .xls workbook

How to reuse my cell without having to recreate each iteration ?

Thx

回答1:

You can not re-use the same cell for multiple rows. Instead of that apply same values to newly created cell. But you can use the same style to multiple cells.

CellStyle cellStyle = workSheet.getWorkbook().createCellStyle();
cellStyle.setAlignment(CellStyle.ALIGN_CENTER);
cellStyle.setWrapText(true);

for (int i=0; i <= records.size(); i++) {
// Create a new row
Row row = workSheet.createRow((short) i);
Cell cell001 = row.createCell(columnIndex);
cell001.setCellValue("some value");
cell001.setCellStyle(cellStyle);
}

回答2:

Use,

newCellStyle = oldCell.getCellStyle();
newCell.setCellStyle(newCellStyle); 

instead of,

newCellStyle.cloneStyleFrom(oldCell.getCellStyle());