对视频播放url进行Blob加密

偏执的太偏执、 2022-05-11 04:46 303阅读 0赞

在知乎上看到一个视频，准备下载下来，结果下载不了，复制地址发现是blob://xxx。知乎帖子：[https://www.zhihu.com/question/62753680/answer/382455062][https_www.zhihu.com_question_62753680_answer_382455062]。

百度发现是对视频地址进行了blob加密，文章地址：[https://blog.csdn.net/qq\_36688143/article/details/79162013][https_blog.csdn.net_qq_36688143_article_details_79162013]。

下面是使用Java Servlet+html5 video结合实现的一个对视频地址进行blob加密的示例。代码参考上文链接。

后台Servlet:

public class MyBlobVideoServlet extends HttpServlet { @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { File file = new File("C:\\Users\\Administrator\\Desktop\\102_d41c7dd69f5eba69800d5c3401a3c384_1.mp4"); String fileName = file.getName(); String userAgent = req.getHeader("User-Agent").toLowerCase(); if (userAgent.indexOf("firefox") != -1) { resp.addHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("GB2312"), "ISO-8859-1")); } else { resp.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8")); } //设置response编码 resp.setCharacterEncoding("UTF-8"); resp.addHeader("Content-Length", "" + file.length()); //设置输出文件类型 resp.setContentType("video/mpeg4"); FileInputStream fis = null; OutputStream os = null; try { //获取response输出流 os = resp.getOutputStream(); fis = new FileInputStream(file); byte[] buffer = new byte[1024]; int len; while ((len = fis.read(buffer)) != -1) { // 输出文件 os.write(buffer,0,len); } } catch (Exception e) { if (null != fis) { fis.close(); } if (null != os) { os.flush(); os.close(); } } } }

页面：

<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gbk"> </head> <body> <h2>blob video demo</h2> <video id="sound" width="500" height="300" controls="controls"></video> <script type="text/javascript"> //创建XMLHttpRequest对象 var xhr = new XMLHttpRequest(); //配置请求方式、请求地址以及是否同步 xhr.open('POST', '/play', true); //设置请求结果类型为blob xhr.responseType = 'blob'; //请求成功回调函数 xhr.onload = function (e) { if (this.status == 200) { //请求成功 //获取blob对象 var blob = this.response; //获取blob对象地址，并把值赋给容器 document.getElementById('sound').src=URL.createObjectURL(blob); } }; xhr.send(); </script> </body> </html>

效果展示：  
![94631648.jpg][]

代码：[https://gitee.com/qincd/my-test-projects][https_gitee.com_qincd_my-test-projects]下blob-video模块。

> 不过，知乎的对视频做了切割。

[https_www.zhihu.com_question_62753680_answer_382455062]: https://www.zhihu.com/question/62753680/answer/382455062
[https_blog.csdn.net_qq_36688143_article_details_79162013]: https://blog.csdn.net/qq_36688143/article/details/79162013
[94631648.jpg]: http://omh46px9n.bkt.clouddn.com/18-5-5/94631648.jpg
[https_gitee.com_qincd_my-test-projects]: https://gitee.com/qincd/my-test-projects