參考鏈接：
https://www.cnblogs.com/weiyiming007/p/10675053.html
http://www.itdecent.cn/p/40f698157330

獲取dns解析時間

和linux中一樣，使用curl命令可以獲取dns解析時間，命令如下

curl -o /dev/null -s -w %{time_namelookup}  http://www.baidu.com

Android中執(zhí)行l(wèi)inux命令，代碼如下：

String getdnstime(){
        Runtime mRuntime = Runtime.getRuntime();
        try {
            //Process中封裝了返回的結(jié)果和執(zhí)行錯誤的結(jié)果
            Process mProcess = mRuntime.exec("curl -o /dev/null -s -w %{time_namelookup}  http://www.baidu.com");
            BufferedReader mReader = new BufferedReader(new InputStreamReader(mProcess.getInputStream()));
            StringBuffer mRespBuff = new StringBuffer();
            char[] buff = new char[1024];
            int ch = 0;
            while ((ch = mReader.read(buff)) != -1) {
                mRespBuff.append(buff, 0, ch);
            }
            mReader.close();
            return mRespBuff.toString();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "";
    }