入坑微信小程序必经之路（八）服务模板通知——WebService接口获取AccessToken

#region 模板消息推送
   public string fw_appid = System.Configuration.ConfigurationManager.AppSettings["appid"].ToString();
   public string fw_secret = System.Configuration.ConfigurationManager.AppSettings["secret"].ToString();
 
 
   /// <summary>
   /// 获取AccessToken
   /// </summary>
   /// <returns></returns>
   [WebMethod(Description = "获取AccessToken")]
   public string GetAccessToken()
   {
       string appid = fw_appid;
       string secret = fw_secret;
       string strJson =wb163Cms.BLL.BLL_Weixin_Config.RequestUrl(string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", appid, secret), "Get");
       //Session["AccessToken"] = wb163Cms.BLL.BLL_Weixin_Config.GetJsonValue(strJson, "access_token");
       return wb163Cms.BLL.BLL_Weixin_Config.GetJsonValue(strJson, "access_token"); 
   }
 
 
  
   #endregion

public class BLL_Weixin_Config
{
 
    //公共方法，request网络获取
    public static string RequestUrl(string url, string method)
    {
        // 设置参数
        HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
        CookieContainer cookieContainer = new CookieContainer();
        request.CookieContainer = cookieContainer;
        request.AllowAutoRedirect = true;
        request.Method = method;
        request.ContentType = "text/html";
        request.Headers.Add("charset", "utf-8");
 
        //发送请求并获取相应回应数据
        HttpWebResponse response = request.GetResponse() as HttpWebResponse;
        //直到request.GetResponse()程序才开始向目标网页发送Post请求
        Stream responseStream = response.GetResponseStream();
        StreamReader sr = new StreamReader(responseStream, Encoding.UTF8);
        //返回结果网页（html）代码
        string content = sr.ReadToEnd();
        return content;
    }
 
 
    //公共方法，获取Json
    public static string GetJsonValue(string jsonStr, string key)
    {
        string result = string.Empty;
        if (!string.IsNullOrEmpty(jsonStr))
        {
            key = "\"" + key.Trim('"') + "\"";
            int index = jsonStr.IndexOf(key) + key.Length + 1;
            if (index > key.Length + 1)
            {
                //先截逗号，若是最后一个，截“｝”号，取最小值
                int end = jsonStr.IndexOf(',', index);
                if (end == -1)
                {
                    end = jsonStr.IndexOf('}', index);
                }
 
                result = jsonStr.Substring(index, end - index);
                result = result.Trim(new char[] { '"', ' ', '\'' }); //过滤引号或空格
            }
        }
        return result;
    }
}