1.依赖
<dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi</artifactId>
        <version>3.13-beta1</version>
    </dependency>
2.使用代码示例
  /**
     * 导出结算报表
     * @param hospitalId
     * @param startDate
     * @param endDate
     * @param response
     */
    @Override
    public void exportBalanceReport(Integer hospitalId, Date startDate, Date endDate, HttpServletResponse response) {
        Map dataMap = this.getOrderBalanceInfoReport(hospitalId, startDate, endDate,1,1,true);
        List<OrderBalanceInfoReportVo> orderBalanceInfoReportVos = (List<OrderBalanceInfoReportVo>) dataMap.get("data");//数据集
       
        HSSFWorkbook workBook = new HSSFWorkbook();// 创建excel工作簿

        // 设置表头字体样式
        HSSFFont headfont = workBook.createFont();
        headfont.setFontName("黑体");
        headfont.setFontHeightInPoints((short) 22);// 字体大小
        headfont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 加粗
        HSSFCellStyle headstyle = workBook.createCellStyle();
        headstyle.setFont(headfont);
        headstyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
        headstyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
        headstyle.setLocked(true);
        headstyle.setWrapText(true);// 自动换行

        // 设置列头字体样式
        HSSFFont columnHeadFont = workBook.createFont();
        columnHeadFont.setFontName("宋体");
        columnHeadFont.setFontHeightInPoints((short) 11);
        columnHeadFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

        // 设置列头的样式
        HSSFCellStyle columnHeadStyle = workBook.createCellStyle();
        columnHeadStyle.setFont(columnHeadFont);
        columnHeadStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
        columnHeadStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
        columnHeadStyle.setLocked(true);
        columnHeadStyle.setWrapText(true);
        HSSFFont font = workBook.createFont();
        font.setFontName("Arial");
        font.setFontHeightInPoints((short) 11);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

        // 设置普通单元格样式
        HSSFCellStyle style = workBook.createCellStyle();
        style.setFont(font);
        style.setAlignment(HSSFCellStyle.ALIGN_LEFT);// 左右居中
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_TOP);// 上下居中
        style.setWrapText(true);
        HSSFCellStyle centerstyle = workBook.createCellStyle();
        centerstyle.setFont(font);
        centerstyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
        centerstyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
        centerstyle.setWrapText(true);

        HSSFSheet sheet = workBook.createSheet();// 创建一个工作表sheet

        // 对第一行做处理，标题的创建
        HSSFRow row = sheet.createRow(0);// 创建第一行
        row.setHeight((short) 600);// 设置表格行的高度
        HSSFCell cell0 = row.createCell(0);
        cell0.setCellValue(new HSSFRichTextString("结算统计报表"));// 设置表名
        cell0.setCellStyle(headstyle);

        //合并第一行单元格
        CellRangeAddress range = new CellRangeAddress(0, 0, 0, 16); //这四个数字分别表示 要合并的第一个单元格所在行，要合并最后一个单元格所在行，要合并第一个单元格所在列，要合并最后一个单元格所在列
        sheet.addMergedRegion(range);
        //第二行列名
        HSSFRow row2 = sheet.createRow(1);
        row2.setHeight((short) 500);
        HSSFCell cell = null;
        String[] headers = { "订单编号", "床位号","管理老师", "护工姓名", "病人姓名", "日期", "天数", "实际订单金额",
                "护工费结算", "管理费结算", "预收款", "预收款方式", "结算收款", "结算方式", "结算日期", "退款金额", "退款方式" };

        // 插入第一行数据标题
        for (int i = 0; i < headers.length; i++) {
            cell = row2.createCell(i);
            cell.setCellValue(headers[i]);
            cell.setCellStyle(columnHeadStyle);
            sheet.setColumnWidth(i, 5500);
        }

        //插入数据行
        if (orderBalanceInfoReportVos.size() > 0) {
            for (int i = 0; i < orderBalanceInfoReportVos.size(); i++) {
                OrderBalanceInfoReportVo orderBalanceInfoReportVo = orderBalanceInfoReportVos.get(i);
                HSSFRow nextRow = sheet.createRow(i + 2);  //数据行从第三行开始
                nextRow.createCell(0).setCellValue(orderBalanceInfoReportVo.getOrderSn());
                nextRow.createCell(1).setCellValue(orderBalanceInfoReportVo.getShipAddr());
                nextRow.createCell(2).setCellValue(orderBalanceInfoReportVo.getManagerName());
                nextRow.createCell(3).setCellValue(String.valueOf(orderBalanceInfoReportVo.getNursingName()));
                nextRow.createCell(4).setCellValue(orderBalanceInfoReportVo.getShipName());
                nextRow.createCell(5).setCellValue(String.valueOf(orderBalanceInfoReportVo.getDateInfo()));
                nextRow.createCell(6).setCellValue(orderBalanceInfoReportVo.getActualDays());
                nextRow.createCell(7).setCellValue(orderBalanceInfoReportVo.getOrderPrice());
                nextRow.createCell(8).setCellValue(orderBalanceInfoReportVo.getWorkerSum());
                nextRow.createCell(9).setCellValue(orderBalanceInfoReportVo.getManagementSum());
                nextRow.createCell(10).setCellValue(orderBalanceInfoReportVo.getPrePaySum());
                nextRow.createCell(11).setCellValue(orderBalanceInfoReportVo.getPrePayType());
                nextRow.createCell(12).setCellValue(orderBalanceInfoReportVo.getBalancePaySum());
                nextRow.createCell(13).setCellValue(orderBalanceInfoReportVo.getBalancePayType());
                nextRow.createCell(14).setCellValue(orderBalanceInfoReportVo.getBalanceDate());
                nextRow.createCell(15).setCellValue(orderBalanceInfoReportVo.getRefundSum());
                nextRow.createCell(16).setCellValue(orderBalanceInfoReportVo.getRefundType());
            }
        }