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[ASP.net教程]微信开放平台


1 微信开放平台:https://open.weixin.qq.com/

2 微信官方教程:https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419316505&token=&lang=zh_CN

3.pc页面显示

4. 通过官方提供的文档,我们可以看出一共分4个步骤

第一步:请求CODE
第二步:通过code获取access_token
第三步:通过access_token调用接口
第4步:获取用户个人信息(UnionID机制)

api:核心代码

public class weixin_helper  {    public weixin_helper()    {    }    /// <summary>    /// 根据AppID和AppSecret获得access token(默认过期时间为2小时)    /// </summary>    /// <returns>Dictionary</returns>    public static Dictionary<string, object> get_access_token()    {      //获得配置信息      oauth_config config = oauth_helper.get_config(2);      string send_url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" +               config.oauth_app_id + "&secret=" + config.oauth_app_key + "";      //发送并接受返回值      string result = Utils.HttpGet(send_url);      if (result.Contains("errmsg"))      {        return null;      }      try      {        Dictionary<string, object> dic = JsonConvert.DeserializeObject<Dictionary<string, object>>(result);        return dic;      }      catch      {        return null;      }    } /// <summary>    /// 取得临时的Access Token(默认过期时间为2小时)    /// </summary>    /// <param name="code">临时Authorization Code</param>    /// <param name="state">防止CSRF攻击,成功授权后回调时会原样带回</param>    /// <returns>Dictionary</returns>    public static Dictionary<string, object> get_access_token(string code, string state)    {      //获得配置信息      oauth_config config = oauth_helper.get_config(2);      string send_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" +               config.oauth_app_id + "&secret=" + config.oauth_app_key + "&code="+code+"&grant_type=authorization_code";      //发送并接受返回值      string result = Utils.HttpGet(send_url);      if (result.Contains("errmsg"))      {        return null;      }      try      {        Dictionary<string, object> dic = JsonConvert.DeserializeObject<Dictionary<string, object>>(result);        return dic;      }      catch      {        return null;      }    }    /// <summary>    /// 根据access_token判断access_token是否过期    /// </summary>    /// <param name="access_token"></param>    /// <returns>true表示未失效</returns>    public static bool check_access_token(string access_token)    {      //获得配置信息      oauth_config config = oauth_helper.get_config(2);      string send_url = "https://api.weixin.qq.com/sns/auth?access_token=" + access_token + "&openid=" + config.oauth_app_id;      //发送并接受返回值      string result = Utils.HttpGet(send_url);      try      {        Dictionary<string, object> dic = JsonConvert.DeserializeObject<Dictionary<string, object>>(result);        if (dic.ContainsKey("errmsg"))        {          if (dic["errmsg"].ToString()=="ok")          {            return true;          }          else          {            return false;          }                  }        return false;      }      catch      {        return false;      }    }   /// <summary>    /// 若fresh_token已过期则根据refresh_token取得新的refresh_token   /// </summary>    /// <param name="refresh_token">refresh_token</param>    /// <returns>Dictionary</returns>    public static Dictionary<string, object> get_refresh_token(string refresh_token)    {      //获得配置信息      oauth_config config = oauth_helper.get_config(2);      string send_url =        "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=" +               config.oauth_app_id + "&grant_type=refresh_token&refresh_token=" + refresh_token;      //发送并接受返回值      string result = Utils.HttpGet(send_url);      if (result.Contains("errmsg"))      {        return null;      }      try      {        Dictionary<string, object> dic = JsonConvert.DeserializeObject<Dictionary<string, object>>(result);        return dic;      }      catch      {        return null;      }    }    /// <summary>    /// 获取登录用户自己的基本资料    /// </summary>    /// <param name="access_token">临时的Access Token</param>    /// <param name="open_id">用户openid</param>    /// <returns>Dictionary</returns>    public static Dictionary<string, object> get_user_info(string access_token, string open_id)    {      //获得配置信息      oauth_config config = oauth_helper.get_config(2);      //发送并接受返回值        string send_url = "https://api.weixin.qq.com/sns/userinfo?access_token="+access_token+"&openid="+open_id;      //发送并接受返回值      string result = Utils.HttpGet(send_url);      if (result.Contains("errmsg"))      {        return null;      }      //反序列化JSON      Dictionary<string, object> dic = JsonHelper.DataRowFromJSON(result);      return dic;    }  }

控制器的核心代码:

#region 微信登录    /// <summary>    /// 微信登录    /// </summary>    public ActionResult WeChat()    {      //获得配置信息      oauth_config config = oauth_helper.get_config(2); //主键id      if (config == null)      {        return Content("出错了,您尚未配置微信相关的API信息!");      }      string state = Guid.NewGuid().ToString().Replace("-", "");      Session["oauth_state"] = state;      string send_url =        "https://open.weixin.qq.com/connect/qrconnect?appid=" + config.oauth_app_id +               "&redirect_uri=" + Utils.UrlEncode(config.return_uri.ToLower()) +               "&response_type=code&scope=snsapi_login&state=" + state +               "#wechat_redirect";      //开始发送      return Redirect(send_url); //跳转到微信自己 指定的关联登陆页面    }    /// <summary>    /// 微信登录返回action    /// </summary>    public ActionResult WeChatReturnUrl(string state, string code)    {      //取得返回参数      string access_token = string.Empty;      string expires_in = string.Empty;      string client_id = string.Empty;      string openid = string.Empty;      string refresh_token = string.Empty;      if (Session["oauth_state"] == null || Session["oauth_state"].ToString() == "" ||        state != Session["oauth_state"].ToString() || string.IsNullOrEmpty(code))//若返回参数中未包含code或者state没有通过验证则提示出错      {        return Content("出错啦,state未初始化!");      }      //第一步:通过code来获取Access Token以及openid      Dictionary<string, object> dic1 = weixin_helper.get_access_token(code, state);      if (dic1 == null || !dic1.ContainsKey("access_token"))      {        return Content("错误代码:,无法获取Access Token,请检查App Key是否正确!");      }      if (dic1 == null || !dic1.ContainsKey("openid"))      {        if (dic1.ContainsKey("errmsg"))        {          return Content("errcode:" + dic1["errcode"] + ",errmsg:" + dic1["errmsg"]);        }        else        {          return Content("出错啦,无法获取用户授权Openid!");        }      }      access_token = dic1["access_token"].ToString();//获取access_token      expires_in = dic1["expires_in"].ToString();//获取过期时间      refresh_token = dic1["refresh_token"].ToString();//获取用于重新刷新access_token的凭证      openid = dic1["openid"].ToString();//用户唯一标示openid      //储存获取数据用到的信息      Session["oauth_name"] = "webchat";      Session["oauth_access_token"] = access_token;      Session["oauth_openid"] = openid;      Session["oauth_refresh_token"] = refresh_token;      #region todo 将获取到的用户信息保存到数据库中      #endregion      //第二步:通过Access Token以及openid来获取用户的基本信息      //Dictionary<string, object> dic2 = weixin_helper.get_user_info(access_token,openid);      //第三步:跳转到指定页面      return Content(WeChatResultJson());    }    /// <summary>    /// 微信登录返回action, 处理用户信息    /// </summary>    public string WeChatResultJson()    {      string oauth_access_token = string.Empty;      string oauth_openid = string.Empty;      string oauth_name = string.Empty;      string oauth_refresh_token = string.Empty;      if (Session["oauth_name"] == null || Session["oauth_access_token"] == null ||        Session["oauth_openid"] == null)      {        return "{\"ret\":\"1\", \"msg\":\"出错啦,Access Token已过期或不存在!\"}";      }      oauth_name = Session["oauth_name"].ToString();      oauth_access_token = Session["oauth_access_token"].ToString();      oauth_openid = Session["oauth_openid"].ToString();      oauth_refresh_token = Session["oauth_refresh_token"].ToString();      if (!weixin_helper.check_access_token(oauth_access_token)) //调用access_token前需判断是否过期      {        Dictionary<string, object> dic1 = weixin_helper.get_refresh_token(oauth_refresh_token);//如果已过期则重新换取新的access_token        if (dic1 == null || !dic1.ContainsKey("access_token"))        {          return "{\"openid\":\"0\", \"msg\":\"出错啦,无法获取access_token!\"}";        }        oauth_access_token = dic1["access_token"].ToString();      }      Dictionary<string, object> dic = weixin_helper.get_user_info(oauth_access_token, oauth_openid);      if (dic == null)      {        return "{\"openid\":\"0\", \"msg\":\"出错啦,无法获取授权用户信息!\"}";      }      try      {        StringBuilder str = new StringBuilder();        str.Append("{");        str.Append("\"openid\": \"" + dic["openid"].ToString() + "\", ");        str.Append("\"nickname\": \"" + dic["nickname"].ToString() + "\", ");        str.Append("\"sex\": \"" + dic["sex"].ToString() + "\", ");        str.Append("\"province\": \"" + dic["province"].ToString() + "\", ");        str.Append("\"city\": \"" + dic["city"].ToString() + "\", ");        str.Append("\"country\": \"" + dic["country"].ToString() + "\", ");        str.Append("\"headimgurl\": \"" + dic["headimgurl"].ToString() + "\", ");        str.Append("\"privilege\": \"" + dic["privilege"].ToString() + "\", ");        str.Append("\"unionid\": \"" + dic["unionid"].ToString() + "\"");        str.Append("\"oauth_name\": \"" + oauth_name + "\"");        str.Append("\"oauth_access_token\": \"" + oauth_access_token + "\"");        str.Append("\"oauth_openid\": \"" + oauth_openid + "\"");        str.Append("}");        return str.ToString();      }      catch      {        return "{\"ret\":\"0\", \"msg\":\"出错啦,无法获取授权用户信息!\"}";      }    }    #endregion

 5.源码下载地址:http://files.cnblogs.com/files/xxpeng/%E5%BE%AE%E4%BF%A1%E6%89%AB%E7%A0%81%E6%8E%88%E6%9D%83%E7%99%BB%E5%BD%95.rar

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