public void download(HttpServletResponse response) throws Exception{
        // 一次读取的数量
        int listCount  = 200000;
        // 求数据库中导出数据的总行数
        Integer totalCount = analysisMapper.totalNum();
        // 根据行数求数据获取次数
        int pageSize = totalCount % listCount > 0 ? (totalCount / listCount) + 1 : totalCount / listCount;
        //创建poi导出数据对象
        SXSSFWorkbook sxssfWorkbook = new SXSSFWorkbook();
        //创建sheet页
        SXSSFSheet sheet = sxssfWorkbook.createSheet();
        //设置表头信息
        SXSSFRow headRow = sheet.createRow(0);
        List<String> indexList = new ArrayList<>();
        for (int pg = 0; pg < pageSize; pg++) {
            List<Map<String, Object>> list = analysisMapper.downloadData(pg * listCount, listCount);
            if(pg == 0 && list.size() > 0){
                Map<String, Object> map = list.get(0);
                for(Map.Entry<String,Object> entry : map.entrySet()){
                    indexList.add(entry.getKey());
                for (int j = 0; j < indexList.size(); j++) {
                    headRow.createCell(j).setCellValue(indexList.get(j));
            // 遍历上面数据库查到的数据
            for (int i = 0; i < list.size(); i++) {
                SXSSFRow dataRow = sheet.createRow(sheet.getLastRowNum() + 1);
                for (int j = 0; j < indexList.size(); j++) {
                    dataRow.createCell(j).setCellValue(list.get(i).get(indexList.get(j)).toString());
        createFile(response, sxssfWorkbook);
private void createFile(HttpServletResponse response,SXSSFWorkbook sxssfWorkbook) throws Exception{
        // 下载导出
        String filename = UUID.randomUUID().toString();
        // 设置头信息
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/vnd.ms-excel");
        //设置成xlsx格式
        response.setHeader("Content-Disposition","attachment;filename="+ URLEncoder.encode(filename + ".xlsx","UTF-8"));
        //创建输出流
        ServletOutputStream outputStream = response.getOutputStream();
        //写入数据
        sxssfWorkbook.write(outputStream);
        //关闭流
        outputStream.close();
        sxssfWorkbook.close();
若果有啥问题请指正。
    （转载请注明花儿为何那样红博客）