JW球员重复不工作？

Question

我有一个用于播放mp4视频的servlet

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    File file = new File("D:\\Software\\apache-tomcat-7.0.57\\apache-tomcat-7.0.57\\bin\\vid\\testMp4.mp4");
    response.setContentType("video/mp4");
    response.setHeader("Content-Disposition",
            "attachment;filename=" + file.getName());
    ServletContext ctx = getServletContext();
    FileInputStream is = new FileInputStream(file);

    int read = 0;
    byte[] bytes = new byte[320652];
    OutputStream os = response.getOutputStream();

    while ((read = is.read(bytes)) != -1) {
        os.write(bytes, 0, read);
    }
    os.flush();
    os.close();
    System.out.println("file sent");
}

我有一个用JW Player播放此视频的页面

<script>
        //alert(window.location.pathname);
        //alert(window.location.);
        jwplayer("mediaplayer").setup({
            width: 520,
            height: 440,
            type:'mp4',
            file: 'http://localhost:8080/WorldCupWeb/getVid',
            tracks: [{
                        file: 'http://localhost:8080/WorldCupWeb/getVid' + '.vtt',
                        kind: 'thumbnails'
                    }]
        });
    </script>

视频播放没有问题，但是当我按重播时它不会重播视频甚至再次调用Servlet。相反，它只是继续显示加载图标，这里有什么问题？请帮帮我