SpringMVC 字节流实现播放多媒体
1、前言
在项目中,我们会遇到在线预览,播放MP3、图片、MP4等。用户上传文件后,将路径存储在数据库中,我们可动态读取数据库的数据,然后通过返回文件路径的字符串,在src中发送请求。当然这需要带参数。后台返回流。
2、前台代码:
<script type="text/javascript">
function getVideo(id){
window.location.href="${pageContext.request.contextPath }/Test/getVideo.do?id="+id;
}
</script>
</head>
<body>
<h3>${message }</h3>
<h1>Hello !!!</h1>
<button id="btn" onclick="getVideo('ea48576f30be1669971699c09ad05c94');">播放</button>
<%-- <video id="video" >
<source src="${path }">
</video> --%>
<audio id="mp3" src="${path }" autoplay="true" controls="true">
</audio>
</body>
3、后台代码:
@Controller
@RequestMapping("/Test")
public class TestController {
/**
* 视频跳转
* @param id
* @return
*/
@RequestMapping("/getVideo.do")
public ModelAndView getVideo(String id) {
ModelAndView mav = new ModelAndView("success");
mav.addObject("path", "/Test/Test/video.do?id="+id);
return mav;
}
/**
* 视频流读取
* @param id
* @param response
* @throws Exception
*/
@RequestMapping("/video.do")
public @ResponseBody void video(String id, HttpServletResponse response)throws Exception{
File file = new File("E:/1.mp3");
FileInputStream in = new FileInputStream(file);
ServletOutputStream out = response.getOutputStream();
byte[] b = null;
while(in.available() >0) {
if(in.available()>10240) {
b = new byte[10240];
}else {
b = new byte[in.available()];
}
in.read(b, 0, b.length);
out.write(b, 0, b.length);
}
in.close();
out.flush();
out.close();
}
}
Reference:
[1] 陶国荣, HTML5实战, 机械工业出版社, 2012, 116-117