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读GCM配置，判定账号是否需要验证；需要验证，就拆分字符串，后六位+剩余部分；post请求去验证

1.AESUtil对称加密

2.HttpWebRequest、HttpWebResponse、StreamReader

创建请求，获取响应流；
请求分get、post两种方式；(*)
读取响应流信息，用到StreamReader ，string类型的（符合JSON格式的）
JSON格式、实体类（实体列表）之间的转化

    public static string HttpPost(string url, string jsonStr)
    {
        HttpWebRequest request = null;
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Ssl3
            | (SecurityProtocolType)192 | (SecurityProtocolType)768 | (SecurityProtocolType)3072;
        ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback((sender, certificate, chain, errors) => true);//验证服务器证书回调自动验证
        try
        {
            request = (HttpWebRequest)WebRequest.Create(url);//创建一个HTTP请求
        }
        catch (Exception ex)
        {
            Console.WriteLine("Http Post请求 创建失败！" + ex.Message);
            //throw new Exception("Http请求创建失败", ex);
            return null;
        }
        request.Method = "POST";//Post请求方式 
        request.ContentType = "application/json";//内容类型
        request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.80 Safari/537.36";
 
        byte[] byteArray;//设置参数，并进行URL编码
        if (jsonStr == null)
        {
            jsonStr = "";
        }
        byteArray = System.Text.Encoding.UTF8.GetBytes(jsonStr);//将Json字符串转化为字节byte数组
        request.ContentLength = byteArray.Length;//设置请求的ContentLength
        Stream writer;
        try
        {
            writer = request.GetRequestStream();//获取用于写入请求数据的Stream对象
        }
        catch (Exception ex)
        {
            Console.WriteLine("获取Http请求写入流失败!" + ex.Message);
            return null;
        }
        writer.Write(byteArray, 0, byteArray.Length);//将请求参数写入流
        writer.Close();//关闭请求流
        HttpWebResponse response;
        try
        {
            response = (HttpWebResponse)request.GetResponse();//获得响应流
        }
        catch (WebException ex)
        {
            Console.WriteLine("获取Http响应流失败!" + ex.Message);
            return null;
        }
        Stream responseStream = response.GetResponseStream();
        StreamReader streamReader = new StreamReader(responseStream, Encoding.GetEncoding("UTF-8"));
        string postContent = streamReader.ReadToEnd();
        streamReader.Close();
        return postContent;//Post请求后服务器返回的数据
    }
}