easyexcel导出excel文件到s3服务器

导出excel文件是开发中常见的需求

常见的做法一般是直接通过请求接口响应对象HttpServletResponse把文件输出

我们可以使用原生的poi工具类操作.也可以使用easypoi.easyexcel等基于poi二次封装的工具处理

下面是代码

/**
     * 导出列表
     *
     * @param request
     * @param response
     */
    @Override
    public void export(AuctionRequest request, HttpServletResponse response) throws IOException {
        Map<String, Object> queryMap = Maps.newHashMap(BeanConvertUtils.beanToMap(request));
        List<Auction> auctions = auctionManager.listAuctions(queryMap);
        if (CollectionUtils.isEmpty(auctions)) {
            throw new AuctionException("当前数据为空");
        }

        List<AuctionDataExportModel> auctionExportModels = auctions.stream().map(item -> {
            AuctionDataExportModel auctionExportModel = new AuctionDataExportModel();
            auctionExportModel.setAuCode(item.getAuCode());
            auctionExportModel.setAuTitle(item.getAuTitle());
         
            return auctionExportModel;
        }).collect(Collectors.toList());

        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setCharacterEncoding("utf-8");
        String fileName = URLEncoder.encode("导出", "UTF-8").replaceAll("\\+", "%20");
        response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + System.currentTimeMillis() + ".xlsx");
        EasyExcel.write(response.getOutputStream(), AuctionDataExportModel.class).sheet("数据区").doWrite(auctionExportModels);

    }



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这样操作乍一看没啥问题.但是我这边前端同事是使用的axios发送的请求,必须指定响应类型为 ‘arraybuffer’ 或者 ‘blob’.

axios({
  method: 'post',
  url: '/export',
  responseType: 'arraybuffer',//'blob'
}).then(res => {})
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正常下载是没有问题的,一旦代码报错.因为指定了响应类型.就拿不到返回的错误信息了.

于是采用了成功的时候后端直接把文件上传到s3服务器,然后把文件地址返给前端.出错的时候把错误信息返给前端,就解决了上述的问题

上代码

/**
     * 导出列表
     *
     * @param request
     */
    @Override
    public String export(AuctionRequest request) {
        Map<String, Object> queryMap = Maps.newHashMap(BeanConvertUtils.beanToMap(request));
        List<Auction> auctions = auctionManager.listAuctions(queryMap);
        if (CollectionUtils.isEmpty(auctions)) {
            throw new AuctionException("当前数据为空");
        }

        List<AuctionDataExportModel> auctionExportModels = auctions.stream().map(item -> {
            AuctionDataExportModel auctionExportModel = new AuctionDataExportModel();
            auctionExportModel.setAuCode(item.getAuCode());
            auctionExportModel.setAuTitle(item.getAuTitle());
            
            return auctionExportModel;
        }).collect(Collectors.toList());


        //上传至s3服务器，同时将路径返回给前台
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        EasyExcel.write(bos, AuctionDataExportModel.class).sheet("数据区").doWrite(auctionExportModels);
        byte[] binary = bos.toByteArray();
        InputStream inputStream = new ByteArrayInputStream(binary);
        String excelName = "导出" + IdWorker.getMillisecond() + ".xls";
        String returnFilePath = CommonsConstants.STORE_AUCTION_SYNC_EXCEL + excelName;
        PutObjectResult putObjectResult = s3Util.uploadFile(inputStream, "xls", returnFilePath);
        org.wildfly.common.Assert.assertNotNull(putObjectResult);
        return returnFilePath;

    }
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我这里是传到s3服务器,其他的文件服务器(minio.七牛云)也都提供类似的上传api.按需替换就好了.