有输出xml文件，但是公众号不能提供服务，直接在地址栏上写music的url也不能找到音乐资源

Question

/** * 音乐消息转为xml * @param newsMessage * @return */public static String musicMessageToXml(MusicMessage musicMessage){ XStream xstream = new XStream(); xstream.alias("xml",musicMessage.getClass());//将xml的根节点改为xml，而不是包名类名 return xstream.toXML(musicMessage);}/** * 音乐消息的组装 * @param fromUserName * @param toUserName * @return */public static String initMusicMessage(String fromUserName,String toUserName){ String message=null; MusicMessage musicMessage=new MusicMessage();//图文消息对象，该对象有消息体属性 Music music=new Music(); music.setTitle("音乐"); music.setDescription("好听的音乐"); music.setMusicURL("http://ghm.tunnel.mobi/Weixin/resource/See You Again.mp3"); music.setHQMusicUrl("http://ghm.tunnel.mobi/Weixin/resource/See You Again.mp3"); music.setThumbMediaId("yFcvFcHnli26TTtyDrqKVyUZL7dPTiaU5C4iv2DBwPvg4Of2v9TnKGBJ-OOG74x4"); musicMessage.setFromUserName(toUserName); musicMessage.setToUserName(fromUserName); musicMessage.setMusic(music); musicMessage.setCreateTime(new Date().getTime()+""); musicMessage.setMsgType(MESSAGE_MUSIC); message=musicMessageToXml(musicMessage);//将消息转换为xml格式 return message; }输出的xml文件为：<xml>  <ToUserName>oTEV-wt2udKmZ0Ao8jcHA0BW6-9U</ToUserName>  <FromUserName>gh_80f9f1461235</FromUserName>  <CreateTime>1442297612460</CreateTime>  <MsgType>music</MsgType>  <Music>    <Title>音乐</Title>    <Description>好听的音乐</Description>    <MusicURL>http://ghm.tunnel.mobi/Weixin/resource/See You Again.mp3</MusicURL>    <HQMusicUrl>http://ghm.tunnel.mobi/Weixin/resource/See You Again.mp3</HQMusicUrl>    <ThumbMediaId>yFcvFcHnli26TTtyDrqKVyUZL7dPTiaU5C4iv2DBwPvg4Of2v9TnKGBJ-OOG74x4</ThumbMediaId>  </Music></xml>