Question

我的项目中有以下数据报告，我想将其导出为excel：但奇怪的是，有时它会成功导出，有时会失败。我已经尝试了很多次，结果当excel表超过17行时，它会导致这样：

页面重定向到包含garblend数据的新页面。
帖子请求已更改为获取请求。

即使导出失败，也确保成功创建了excel，因为我已将其写入磁盘并检查了该文件。以下是控制器，我出了什么问题？

   @RequestMapping("/download")
    public void download(HttpServletRequest request, HttpServletResponse response, ReportCondition condition){
        try {
            List<HashMap<String, String>> mapList = reportFormService.find(condition);
            if(mapList == null || mapList.size() == 0){
                logger.info("No reports...");
            }

            Map<String, Date> dateMap = DateConditionUtil.getStartEndDate1(condition.getStartDate(), condition.getEndDate());
            String startDate = DateFormatUtils.format(dateMap.get("startDate"), "yyyyMMdd");
            String endDate = DateFormatUtils.format(dateMap.get("endDate"), "yyyyMMdd");
            String[] titleArr = new String[]{"序号","日期","应用系统","短信服务商","请求发送总数","请求成功数量","实际短信条数","实际成功条数","费用","失败数量","成功率"};
            String[] fieldArr = new String[]{"ID","RECORDDATE","APPNAME","PROVIDERNAME","SENDCOUNT","SUCCESSCOUNT","SENDSUM","SUCCESSSUM","TOTALFEE","FAILURECOUNT","SUCCESSRATE"};

            ByteArrayOutputStream os = new ByteArrayOutputStream();
            WorkBookUtil.createExcel(titleArr, fieldArr, mapList, os);

            try(BufferedInputStream bis = new BufferedInputStream(new ByteArrayInputStream(os.toByteArray()));
                BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream())){
                byte[] buff = new byte[1024];
                int bytes;
                while (-1 != (bytes = bis.read(buff, 0, buff.length))) {
                    bos.write(buff, 0, bytes);
                }
                bos.flush();
            }catch (Exception e){
                logger.error(e);
            }

            response.setCharacterEncoding("utf-8");
            response.setHeader("content-disposition", "attachment;filename=" + String.format("%s-%s.xls", startDate, endDate));
            response.setContentType("application/vnd.ms-excel;charset=utf-8");

        } catch (IOException e){
            logger.error("Export failed", e);
        }
    }

Answer 1

在创建.xls文件之前，应首先设置响应头。所以试试这个：

response.setCharacterEncoding("utf-8");
response.setHeader("content-disposition", "attachment;filename=" + String.format("%s-%s.xls", startDate, endDate));
response.setContentType("application/vnd.ms-excel;charset=utf-8");

ByteArrayOutputStream os = new ByteArrayOutputStream();
WorkBookUtil.createExcel(titleArr, fieldArr, mapList, os);
// ...

Answer 2

尝试在将字节写入用户之前添加响应标头。添加内容长度标题也会有所帮助。通过createExcel致电os.toByteArray().length后，您就可以了解相关信息。另外close() bos flush()之后{{1}}。

spring mvc export excel有时失败，数据在页面上显示garblend

2 个答案: