POI導出文件縮放至A4紙大小，poi合並單元格顯示邊框不完整問題

PrintSetup print = exportExcel.getSheet().getPrintSetup(); //拿到sheet對象首先
print.setFitWidth((short)1);
print.setPaperSize(HSSFPrintSetup.A4_PAPERSIZE); //紙張類型
print.setScale((short)68);//自定義縮放①，此處100為無縮放HSSFPrintSetup
exportExcel.getSheet().setAutobreaks(false);
print.setLeftToRight(true);//列從左向右顯示②
Footer footer = exportExcel.getSheet().getFooter();
footer.setRight( "Page " + HSSFFooter.page() + "  of  " + HSSFFooter.numPages());//






解決poi合並單元格，邊框顯示不完整問題

XSSFRow tableHead = sheet.createRow(2);
tableHead.setHeightInPoints(40);
Cell tableHeadCell0 = tableHead.createCell(0);
tableHeadCell0.setCellStyle(doble2);
tableHeadCell0.setCellValue("職務/姓名/周");
for (int j = 1; j <= 2; j++) {
    tableHeadCell0 = tableHead.createCell(j);
    tableHeadCell0.setCellStyle(doble2); //style為帶邊框的樣式 上面有定義
    tableHeadCell0.setCellValue("");
}