推送视频流播放多媒体文件

从文件服务器读取音视频文件，以流的方式传给前台，并能够播放视频。

做了一个demo，用html5的video，audio标签实现。

后台实现代码：

public boolean getVideos(String id, HttpServletRequest request, HttpServletResponse response){
    boolean res = false;
    response.reset();
    //获取从那个字节开始读取文件
    String rangeString = request.getHeader("Range");
    VideoFileDetails videoSource = videoMapper.selectById(id);//根据id获取文件对象
    try {
        //获取响应的输出流
        OutputStream outputStream = response.getOutputStream();
        StringBuffer sb =new StringBuffer(upLoadPath); //upLoadPath是服务器文件根路径
        sb.append("/").append(videoSource.getFilePath()); 
        File file = new File(sb.toString());//此处是完整文件路径
        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("-")));
                //设置内容类型
                response.setHeader("Content-Type", "video/mp4");
                //设置此次相应返回的数据长度
                response.setHeader("Content-Length", String.valueOf(fileLength - range));
                //设置此次相应返回的数据范围
                response.setHeader("Content-Range", "bytes "+range+"-"+(fileLength-1)+"/"+fileLength);
                //返回码需要为206，而不是200
                response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);
                //设定文件读取开始位置（以字节为单位）
                targetFile.seek(range);
            }else {//下载

                //设置响应头，把文件名字设置好
                response.setHeader("Content-Disposition", "attachment; filename="+videoSource.getFileTitle() );
                //设置文件长度
                response.setHeader("Content-Length", String.valueOf(fileLength));
                //解决编码问题
                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.getFileTitle()+" not exists";
            //解决编码问题
            response.setHeader("Content-Type","application/json");
            outputStream.write(message.getBytes(StandardCharsets.UTF_8));
        }

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


    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return res;
}

controller如下： 注意：返回类型不能包装，文件流通过response返回给前端

@AutoLog(value = "后端推流")
@ApiOperation(value="后端推流", notes="后端推流")
@GetMapping(value = "/getVideos")
public void getVideos(@RequestParam(name="id",required=true) String id,
                  HttpServletRequest request,HttpServletResponse response
) {

 boolean res = videoFileDetailsService.getVideos(id,request,response);

}