java流播放视频 java读取视频流

/**

* 获取视频流

* @param response

* @param videoId 视频存放信息索引

* @return

* @author xWang

* @Date 2020-05-20

*/

@RequestMapping("/getVideo/{videoId}")

public void getVideo(HttpServletRequest request,HttpServletResponse response,@PathVariable Integer videoId)
{

//视频资源存储信息

VideoSource videoSource = videoSourceService.selectById(videoId);
response.reset();

//获取从那个字节开始读取文件

String rangeString = request.getHeader("Range");
try {

//获取响应的输出流

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("-")));

//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.getFileName() );

//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.getFileName()+" 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) {
} catch (IOException e) {
}
}