2、辅助方法(Tools类)：
namespace SWX.Utils
{
/// <summary>
/// 工具类
/// </summary>
public class Tools
{
#region 获取Json字符串某节点的值
/// <summary>
/// 获取Json字符串某节点的值
/// </summary>
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;
}
#endregion
}
}
3、判断access_token是否过期(WXApi类)：
#region 验证Token是否过期
/// <summary>
/// 验证Token是否过期
/// </summary>
public static bool TokenExpired(string access_token)
{
string jsonStr = HttpRequestUtil.RequestUrl(string.Format("https://www.easck.com/cgi-bin/menu/get?access_token={0}", access_token));
if (Tools.GetJsonValue(jsonStr, "errcode") == "42001")
{
return true;
}
return false;
}
#endregion
4、请求微信接口，获取access_token(WXApi类)：
#region 获取Token
/// <summary>
/// 获取Token
/// </summary>
public static string GetToken(string appid, string secret)
{
string strJson = HttpRequestUtil.RequestUrl(string.Format("https://www.easck.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", appid, secret));
return Tools.GetJsonValue(strJson, "access_token");
}
#endregion
5、全局存储与更新access_token(AdminUtil类)：
#region 获取access_token
/// <summary>
/// 获取access_token
/// </summary>
public static string GetAccessToken(PageBase page)
{
string access_token = string.Empty;
UserInfo user = GetLoginUser(page);
if (user != null)
{
if (string.IsNullOrWhiteSpace(user.access_token)) //尚未保存过access_token
{
access_token = WXApi.GetToken(user.AppID, user.AppSecret);
}
else
{
if (WXApi.TokenExpired(user.access_token)) //access_token过期
{
access_token = WXApi.GetToken(user.AppID, user.AppSecret);
}
else
{
return user.access_token;
}
}
MSSQLHelper.ExecuteSql(string.Format("update SWX_Config set access_token='{0}' where UserName='{1}'", access_token, user.UserName));
}
return access_token;
}
#endregion
