public void queryStudentInfoPolling(HttpServletResponse responese) throws IOException {
        //新建工作簿
        XSSFWorkbook xssfWorkbook = new XSSFWorkbook();
        //新建工作表
        XSSFSheet sheet = xssfWorkbook.createSheet("2020技术栈");

        //指定合并开始行、合并结束行 合并开始列、合并结束列
        CellRangeAddress rangeAddress = new CellRangeAddress(0, 0, 0, 3);
        sheet.addMergedRegion(rangeAddress);
        XSSFRow row = sheet.createRow(0);//创建行，指定起始行号，从0开始
        for(int i=0;i<4;i++){
            //创建样式对象
            CellStyle style = xssfWorkbook.createCellStyle();
            if(i==0){
                XSSFCell cell = row.createCell(0);//创建单元格，指定起始列号，从0开始
                cell.setCellValue("2021年大数据开发文档");
                //设置居中
                style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中
                style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中
                //设置字体
                XSSFFont font = xssfWorkbook.createFont();
                //font.setFontName("黑体");
                font.setFontHeightInPoints((short) 12);//设置字体大小
                style.setFont(font);
                cell.setCellStyle(style);
            }else{
                XSSFCell cell = row.createCell(i);
                //设置边框
                style.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
                style.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
                style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
                style.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
                //style.setWrapText(true);//自动换行
                cell.setCellStyle(style);
            }
        }

        //创建数据表头
        XSSFRow row1 = sheet.createRow(1);//创建行，指定起始行号，从1开始
        for(int j=0;j<4;j++){
            XSSFCell cells = row1.createCell(j);//创建列
            switch (j) {
                case 0:
                    cells.setCellValue("姓名");
                    break;
                case 1:
                    cells.setCellValue("性别");
                    break;
                case 2:
                    cells.setCellValue("年龄");
                    break;
                case 3:
                    cells.setCellValue("电话");
                    break;
            }
            CellStyle styles = xssfWorkbook.createCellStyle();
            //设置居中
            styles.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中
            styles.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中
            //设置边框
            styles.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
            styles.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
            styles.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
            styles.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
            //styles.setWrapText(true);//自动换行
            //设置字体
            XSSFFont fonts = xssfWorkbook.createFont();
            styles.setFont(fonts);
            //设置背景
            styles.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
            //styles.setFillForegroundColor((short) 18);// 设置背景色

            cells.setCellStyle(styles);
        }
        //创建数据表体
        List<UserInfo> userList = new ArrayList();
        UserInfo userInfo = new UserInfo();
        userInfo.setName("张三");
        userInfo.setSex("男");
        userInfo.setAge("22");
        userInfo.setTel("18392863010");
        userList.add(userInfo);
        for(int n=0;n<userList.size();n++){
            UserInfo info = userList.get(n);
            sheet.autoSizeColumn(1);

            XSSFRow rown = sheet.createRow(n+2);
            for(int m=0;m<4;m++){
                //设置列宽
               sheet.setColumnWidth(m, sheet.getColumnWidth(m) * 18/10);

                XSSFCell celln = rown.createCell(m);//创建列
                switch (m) {
                    case 0:
                        celln.setCellValue(info.getName());
                        break;
                    case 1:
                        celln.setCellValue(info.getSex());
                        break;
                    case 2:
                        celln.setCellValue(info.getAge());
                        break;
                    case 3:
                        celln.setCellValue(info.getTel());
                        break;
                }

            
                CellStyle stylesc = xssfWorkbook.createCellStyle();
                //设置居中
                stylesc.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中
                stylesc.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中
                //设置边框
                stylesc.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
                stylesc.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
                stylesc.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
                stylesc.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
                //stylesc.setWrapText(true);//自动换行
                //设置字体
                XSSFFont fonts = xssfWorkbook.createFont();
                stylesc.setFont(fonts);
                //设置背景
                stylesc.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
                //stylesc.setFillForegroundColor((short) 18);// 设置背景色
                celln.setCellStyle(stylesc);
            }
        }

        //将excel的数据写入文件
        ByteArrayOutputStream byteOutputStream = null;
        byte[] bytes = null;
        try {
            byteOutputStream  = new ByteArrayOutputStream();
            xssfWorkbook.write(byteOutputStream);
            bytes = byteOutputStream.toByteArray();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            byteOutputStream.close();
        }
        ServletOutputStream outputStream = responese.getOutputStream();
        try {
            responese.reset();
            responese.setHeader("Content-Disposition", "attachment; filename="+new String( "开发测试.xlsx".getBytes(), "ISO8859-1" ));//要保存的文件名
            responese.setContentType("application/octet-stream; charset=utf-8");
            outputStream.write(bytes);
            outputStream.flush();
        } finally {
            if (outputStream != null) {
                outputStream.close();
            }
        }

    }