/// <summary>
/// 获取Access_token
/// </summary>
/// <param name="appid">微信公众号appid</param>
/// <param name="secret">微信公众号appsecret</param>
/// <returns></returns>
private static Access_token GetAccess_token(string appid, string secret)
{
string strUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appid + "&secret=" + secret;
Access_token mode = new Access_token();
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(strUrl); //用GET形式请求指定的地址
req.Method = "GET";
using (WebResponse wr = req.GetResponse())
{
//HttpWebResponse myResponse = (HttpWebResponse)req.GetResponse();
StreamReader reader = new StreamReader(wr.GetResponseStream(), Encoding.UTF8);
string content = reader.ReadToEnd();
reader.Close();
reader.Dispose();
//在这里对Access_token 赋值
Access_token token = new Access_token();
token = common.JsonHelper.ParseFromJson <Access_token>(content);
mode.access_token = token.access_token;
mode.expires_in = token.expires_in;
}
return(mode);
}
/// <summary>
/// 根据当前日期 判断Access_Token 是否超期 如果超期返回新的Access_Token 否则返回之前的Access_Token
/// </summary>
/// <param name="datetime"></param>
/// <returns></returns>
public static string IsExistAccess_Token()
{
string Token = string.Empty;
DateTime YouXRQ;
// 读取XML文件中的数据，并显示出来 ，注意文件路径
string filepath = HttpContext.Current.Server.MapPath("\\Files\\WXFiles\\AccessToken.xml");
XmlDocument xml = common.xmlHelper.getXML(filepath);
Token = xml.SelectSingleNode("xml").SelectSingleNode("Access_Token").InnerText;
YouXRQ = Convert.ToDateTime(xml.SelectSingleNode("xml").SelectSingleNode("Access_YouXRQ").InnerText);
//TimeSpan st1 = new TimeSpan(YouXRQ.Ticks); //最后刷新的时间
//TimeSpan st2 = new TimeSpan(DateTime.Now.Ticks); //当前时间
//TimeSpan st = st2 - st1; //两者相差时间
if (DateTime.Now > YouXRQ)
{
DateTime _youxrq = DateTime.Now;
string appid = xml.SelectSingleNode("xml").SelectSingleNode("appid").InnerText;
string secret = xml.SelectSingleNode("xml").SelectSingleNode("secret").InnerText;
Access_token mode = GetAccess_token(appid, secret);
xml.SelectSingleNode("xml").SelectSingleNode("Access_Token").InnerText = mode.access_token;
_youxrq = _youxrq.AddSeconds(int.Parse(mode.expires_in));
xml.SelectSingleNode("xml").SelectSingleNode("Access_YouXRQ").InnerText = _youxrq.ToString();
xml.Save(filepath);
Token = mode.access_token;
}
return(Token);
}