假如已这样的表头导出数据

 1.把包含表头的excel添加到项目资源目录

 2.编写代码读取表头所在sheet,并且加入需导出的数据

/**
     * 导出excel
     */
    public static void downloadExcel(List<List<Object>> list, HttpServletResponse response) throws IOException {
        /*String tempPath =System.getProperty("java.io.tmpdir") + IdUtil.fastSimpleUUID() + ".xlsx";
        File file = new File(tempPath);*/

        //获取模板文件第一个sheet
        ClassPathResource resource = new ClassPathResource("cadreAndCompany.xls");

        ExcelReader reader = ExcelUtil.getReader(resource.getStream());
        Sheet rows = reader.getSheets().get(0);

        BigExcelWriter bigExcelWriter = new BigExcelWriter(rows);
        bigExcelWriter.passRows(3);//跳过表头

        // 一次性写出内容，使用默认样式，强制输出标题
        bigExcelWriter.write(list);
        //response为HttpServletResponse对象
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
        //test.xls是弹出下载对话框的文件名，不能为中文，中文请自行编码
        response.setHeader("Content-Disposition","attachment;filename=file.xlsx");
        ServletOutputStream out=response.getOutputStream();
        // 终止后删除临时文件
        //file.deleteOnExit();
        bigExcelWriter.flush(out, true);
        //此处记得关闭输出Servlet流
        IoUtil.close(out);
    }