java后台讀取視頻文件獲取視頻流后使用h5進行播放/下載

后台代碼：

/**
     * 獲取視頻流
     * @param response
     * @param videoId 視頻存放信息索引
     * @return
     * @author xWang
     * @Date 2020-05-20
     */
    @RequestMapping("/getVideo/{videoId}")
    public void getVideo(HttpServletRequest request,HttpServletResponse response,@PathVariable Integer videoId)
    {
        //視頻資源存儲信息
        VideoSource videoSource = videoSourceService.selectById(videoId);
        response.reset();
        //獲取從那個字節開始讀取文件
        String rangeString = request.getHeader("Range");

        try {
            //獲取響應的輸出流
            OutputStream outputStream = response.getOutputStream();
            File file = new File(videoSource.getFileAddress());
            if(file.exists()){
                RandomAccessFile targetFile = new RandomAccessFile(file, "r");
                long fileLength = targetFile.length();
                //播放
                if(rangeString != null){

                    long range = Long.valueOf(rangeString.substring(rangeString.indexOf("=") + 1, rangeString.indexOf("-")));
                    //設置內容類型
                    response.setHeader("Content-Type", "video/mp4");
                    //設置此次相應返回的數據長度
                    response.setHeader("Content-Length", String.valueOf(fileLength - range));
                    //設置此次相應返回的數據范圍
                    response.setHeader("Content-Range", "bytes "+range+"-"+(fileLength-1)+"/"+fileLength);
                    //返回碼需要為206，而不是200
                    response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);
                    //設定文件讀取開始位置（以字節為單位）
                    targetFile.seek(range);
                }else {//下載

                    //設置響應頭，把文件名字設置好
                    response.setHeader("Content-Disposition", "attachment; filename="+videoSource.getFileName() );
                    //設置文件長度
                    response.setHeader("Content-Length", String.valueOf(fileLength));
                    //解決編碼問題
                    response.setHeader("Content-Type","application/octet-stream");
                }


                byte[] cache = new byte[1024 * 300];
                int flag;
                while ((flag = targetFile.read(cache))!=-1){
                    outputStream.write(cache, 0, flag);
                }
            }else {
                String message = "file:"+videoSource.getFileName()+" not exists";
                //解決編碼問題
                response.setHeader("Content-Type","application/json");
                outputStream.write(message.getBytes(StandardCharsets.UTF_8));
            }

            outputStream.flush();
            outputStream.close();

        } catch (FileNotFoundException e) {

        } catch (IOException e) {

        }
    }

前端頁面：

<!-- poster:視頻封面圖片地址 -->

<video id="my-video" class="video-js vjs-big-play-centered" controls="controls" poster="">
     <source src="/videoSource/getVideo/${videoId}" type='video/mp4'>
          <p class="vjs-no-js">
               你的瀏覽器貌似不支持 %>_<%
               <a href="http://videojs.com/html5-video-support/" target="_blank">supports HTML5 video</a>
          </p>
</video>