获取网络时间失败，求大神指点

private void GainTime() {    new Thread(new Runnable() {        @Override        public void run() {         try {             URL url=new URL("http://www.taobao.com");             URLConnection uc=url.openConnection();             uc.connect();             long id=uc.getDate();            Date date=new Date(id);             SimpleDateFormat formats=new SimpleDateFormat("网络时间："+"HH：mm：ss", Locale.CHINA);            nowTime = formats.format(date);             Log.i("时间", date.getHours() + "时" + date.getMinutes() + "分"                     + date.getSeconds() + "秒" + "\n" + nowTime);

}catch (Exception e){             e.printStackTrace();         }            handler.sendEmptyMessage(0);        }

}).start();

handler=new Handler(){        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);

time_texts.setText(nowTime);            if (nowTime==null||nowTime.equals("")){                SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");                time_texts.setText(sdf.format(new Date()) + "(" + "系统时间" + ")");            }        }

};

}public void onClick(View view){    GainTime();}