微信Accesstoken通过xml文件方式保存

 　　　　//获取accessToken

        public static AccessToken GetAccessToken()

        {

            string AppID = JobBase.GetConfParamValue(ParamEnum.AppID);

            string AppSecret = JobBase.GetConfParamValue(ParamEnum.AppSecret);

            string accessTokenUrl = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", AppID, AppSecret);//

            string accessTokenJson = RequestHelper.SendGet(accessTokenUrl);

            JObject json = JObject.Parse(accessTokenJson);

            AccessToken Token = new AccessToken();

            Token.Access_token = json["access_token"].ToString().Replace("\"", string.Empty).Trim();

            Token.Expires_in = json["expires_in"].ToString();//DateTime.Now.AddSeconds(Convert.ToInt32(json["expires_in"])).ToString();

            return Token;

        }





        public static string GetExistAccessToken()

        {

            // 读取XML文件中的数据        

            //string filePath = System.Web.HttpContext.Current.Server.MapPath("XML/Token.xml");

            //string filePath = "http://。。。/QYXML/Token.xml";     

            string filePath = JobBase.GetConfApiValue(IplatformEnum.TokenXML);

            FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);

            XmlDocument xml = new XmlDocument();

            //xml.Load(filePath);

            xml.Load(fs);

            fs.Close();

            string Token = xml.SelectSingleNode("xml").SelectSingleNode("AccessToken").InnerText.ToString().Trim();

            DateTime AccessExpires = Convert.ToDateTime(xml.SelectSingleNode("xml").SelectSingleNode("AccessExpires").InnerText);

            if (DateTime.Now >= AccessExpires)

            {

                FileStream fstream = new FileStream(filePath, FileMode.Create, FileAccess.Write);

                AccessToken mode = GetAccessToken();

                xml.SelectSingleNode("xml").SelectSingleNode("AccessToken").InnerText = mode.Access_token;

                DateTime _accessExpires = DateTime.Now.AddSeconds(int.Parse(mode.Expires_in) - 900);//1h45min

                xml.SelectSingleNode("xml").SelectSingleNode("AccessExpires").InnerText = _accessExpires.ToString();

                //xml.Save(filePath);

                xml.Save(fstream);//此处文件保存容易报错，xml文件每次重写全覆盖不完全

                fstream.Close();

                Token = mode.Access_token;

            }

            return Token;

        }



        public static void UpdateXML(AccessToken mode)

        {

            string filePath = JobBase.GetConfApiValue(IplatformEnum.TokenXML);

            StreamReader sr = new StreamReader(filePath, System.Text.Encoding.UTF8);

            XmlDocument xmldoc = new XmlDocument();

            xmldoc.Load(sr);

            sr.Close();

            sr.Dispose();

            xmldoc.SelectSingleNode("xml").SelectSingleNode("AccessToken").InnerText = mode.Access_token;

            DateTime _accessExpires = DateTime.Now.AddSeconds(int.Parse(mode.Expires_in) - 900);

            xmldoc.SelectSingleNode("xml").SelectSingleNode("AccessExpires").InnerText = _accessExpires.ToString();

            xmldoc.Save(filePath);

        }