Adding border to a merged region in POI XSSF workbook

Question

I\'m using apache poi 3.7 and I need to put border to a range of cells or merged region.

how can I to apply border to a merged region when the sheet and workbook type is

Answer 1

Do this for multiple rows.

Workbook wb = new HSSFWorkbook();

// create a new sheet
Sheet sheet = wb.createSheet();


CellStyle borderStyle = wb.createCellStyle();
borderStyle.setBorderBottom(CellStyle.BORDER_THIN);
borderStyle.setBorderLeft(CellStyle.BORDER_THIN);
borderStyle.setBorderRight(CellStyle.BORDER_THIN);
borderStyle.setBorderTop(CellStyle.BORDER_THIN);
borderStyle.setAlignment(CellStyle.ALIGN_CENTER);
Sheet sheet1 = wb.createSheet("Test Sheet");
Row row = null;
Cell cell;
for (int i = 1; i <= 5; ++i) {
    row = sheet1.createRow(i);
    for(int j=1;j<=5;j++){
        cell= row.createCell(j);
        cell.setCellStyle(borderStyle);
        if (i == 1 && j==1) {
            cell.setCellValue("Centred Text");
        } 
    }
}
sheet1.addMergedRegion(new CellRangeAddress(1, 5, 1, 5));