导出Excel

一、加黑色边框  合并单元格

    CellRangeAddress cratitle = new CellRangeAddress(0, 0, 0, len);  //合并单元格  起始行，结束行，起始列，结束列
    CellRangeAddress cradw = new CellRangeAddress(1, 3, 0, 0);
    CellRangeAddress crazj = new CellRangeAddress(1, 1, 1, 4);
    CellRangeAddress craqs = new CellRangeAddress(1, 1, 5, 26);
    CellRangeAddress crahs = new CellRangeAddress(2, 3, 1, 1);
    CellRangeAddress crayjt = new CellRangeAddress(2, 3, 2, 2);
    CellRangeAddress crabze = new CellRangeAddress(2, 3, 3, 3);
    CellRangeAddress craznj = new CellRangeAddress(2, 3, 4, 4);
    List<CellRangeAddress> craList = new ArrayList<CellRangeAddress>();
    craList.add(cratitle);
    craList.add(cradw);
    craList.add(crazj);
    craList.add(craqs);
    craList.add(crahs);
    craList.add(crayjt);
    craList.add(crabze);
    craList.add(craznj);
    for (CellRangeAddress cellRangeAddress : craList) {
        // 使用RegionUtil类为合并后的单元格添加边框
        RegionUtil.setBorderBottom(1, cellRangeAddress, sheet); // 下边框
        RegionUtil.setBorderLeft(1, cellRangeAddress, sheet); // 左边框
        RegionUtil.setBorderRight(1, cellRangeAddress, sheet); // 有边框
        RegionUtil.setBorderTop(1, cellRangeAddress, sheet); // 上边框
    }
                
    sheet.addMergedRegion(cratitle);// 标题
    sheet.addMergedRegion(cradw);// 单位
    sheet.addMergedRegion(crazj);// 总计
    sheet.addMergedRegion(craqs);// 期数
    sheet.addMergedRegion(crahs);// 户数
    sheet.addMergedRegion(crayjt);// 应计提工会经费
    sheet.addMergedRegion(crabze);// 不足额金额
    sheet.addMergedRegion(craznj);// 滞纳金

 二、宽度自适应

SXSSFSheet sheet = sfWb.getSheetAt(0);
sheet.trackAllColumnsForAutoSizing();  //先设置表格所有列宽度可自动调整
sheet.autoSizeColumn(j); //将某一列设置自动调整