分文件夹下载文件并压缩接口_下载zip接口-优快云博客

本文链接：https://blog.youkuaiyun.com/cjwlm123456/article/details/122966464

本文介绍了如何使用Java编程实现一个功能，该功能能够将指定文件夹的内容下载到本地，并且对下载的文件夹进行压缩处理。通过这个接口，用户可以方便地获取和打包远程文件系统的资源。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

   /**
     * 批量下载压缩
     * @param policyId
     * @param response
     * @return
     */
    @GetMapping(value = "batchDownLoad")
    public WebResponse batchDownLoad(Integer policyId, HttpServletResponse response) {

        //下载的压缩包的名
        String downloadFilename = UUID.randomUUID().toString().replace("-", "");
        logger.info("下载的压缩包的名:" +downloadFilename);
        ZipOutputStream zos = null;
        InputStream in = null;
        try {
            response.setContentType("application/octet-stream");// 指明response的返回对象是文件流
            response.setHeader("Content-Disposition", "attachment; filename=" +downloadFilename + ".zip");
            zos = new ZipOutputStream(response.getOutputStream());
            List<PolicyDeclare> policyDeclares = policyDeclareMapper.selectByPolicyId(policyId);
            for (PolicyDeclare policyDeclare : policyDeclares) {
                HashMap<String, InputStream>  fileMap = new HashMap<>();
                if (StringUtil.isNotEmpty(policyDeclare.getAnnex())) {
                    JSONArray jsonArray = JSON.parseArray(policyDeclare.getAnnex());
                    for (int i =0; i<jsonArray.size(); i++) {
                        URL url = new URL(jsonArray.getJSONObject(i).getString("url"));
                        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
                        //设置超时间为3秒
                        conn.setConnectTimeout(3*1000);
                        //防止屏蔽程序抓取而返回403错误
                        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");

                        //得到输入流
                        InputStream inputStream = conn.getInputStream();
                        fileMap.put(jsonArray.getJSONObject(i).getString("name"), inputStream);
                    }
                }
                for (Map.Entry<String, InputStream> fileMaps : fileMap.entrySet()) {
                    String newFileName = fileMaps.getKey();
                    //打压缩包
                    //entry.getKey()就是上述所说的最外层的文件夹，也是自己定义的。
                    zos.putNextEntry(new ZipEntry(policyDeclare.getEntName() + "\\" + newFileName));
                    //文件路径放入流
                    in = fileMaps.getValue();
                    byte[] buffer = new byte[1024];
                    int r = 0;
                    while ((r = in.read(buffer)) != -1) {
                        zos.write(buffer, 0, r);
                    }
                    in.close();
                    zos.flush();
                }
            }

        } catch (Exception e) {
//            log.error("zipFiles error!!", e);
        } finally {
            if (zos!=null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                try {
                    zos.flush();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (in!=null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

}