asp.net实现微信公众账号接口开发教程

说起微信公众帐号，大家都不会陌生，使用这个平台能给网站或系统增加一个新亮点，直接进入正题吧，在使用之前一定要仔细阅读官方API文档。
使用.net实现的方法：
//微信接口地址 页面代码:

weixin _wx = new weixin(); string postStr = ""; if (Request.HttpMethod.ToLower() == "post") { Stream s = System.Web.HttpContext.Current.Request.InputStream; byte[] b = new byte[s.Length]; s.Read(b, 0, (int)s.Length); postStr = Encoding.UTF8.GetString(b); if (!string.IsNullOrEmpty(postStr)) //请求处理 { _wx.Handle(postStr); } } else { _wx.Auth(); } 

具体处理类

/// <summary> /// 微信公众平台操作类 /// </summary> public class weixin { private string Token = "my_weixin_token"; //换成自己的token public void Auth() { string echoStr = System.Web.HttpContext.Current.Request.QueryString["echoStr"]; if (CheckSignature()) //校验签名是否正确 { if (!string.IsNullOrEmpty(echoStr)) { System.Web.HttpContext.Current.Response.Write(echoStr); //返回原值表示校验成功 System.Web.HttpContext.Current.Response.End(); } } }   public void Handle(string postStr) { //封装请求类 XmlDocument doc = new XmlDocument(); doc.LoadXml(postStr); XmlElement rootElement = doc.DocumentElement; //MsgType XmlNode MsgType = rootElement.SelectSingleNode("MsgType"); //接收的值--->接收消息类(也称为消息推送) RequestXML requestXML = new RequestXML(); requestXML.ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText; requestXML.FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText; requestXML.CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText; requestXML.MsgType = MsgType.InnerText;  //根据不同的类型进行不同的处理 switch (requestXML.MsgType) { case "text": //文本消息 requestXML.Content = rootElement.SelectSingleNode("Content").InnerText; break; case "image": //图片 requestXML.PicUrl = rootElement.SelectSingleNode("PicUrl").InnerText; break; case "location": //位置 requestXML.Location_X = rootElement.SelectSingleNode("Location_X").InnerText; requestXML.Location_Y = rootElement.SelectSingleNode("Location_Y").InnerText; requestXML.Scale = rootElement.SelectSingleNode("Scale").InnerText; requestXML.Label = rootElement.SelectSingleNode("Label").InnerText; break; case "link": //链接 break; case "event": //事件推送 支持V4.5+ break; }  //消息回复 ResponseMsg(requestXML); }   /// <summary> /// 验证微信签名 /// * 将token、timestamp、nonce三个参数进行字典序排序 /// * 将三个参数字符串拼接成一个字符串进行sha1加密 /// * 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信。 /// </summary> /// <returns></returns> private bool CheckSignature() { string signature = System.Web.HttpContext.Current.Request.QueryString["signature"]; string timestamp = System.Web.HttpContext.Current.Request.QueryString["timestamp"]; string nonce = System.Web.HttpContext.Current.Request.QueryString["nonce"]; //加密/校验流程： //1. 将token、timestamp、nonce三个参数进行字典序排序 string[] ArrTmp = { Token, timestamp, nonce }; Array.Sort(ArrTmp);//字典排序 //2.将三个参数字符串拼接成一个字符串进行sha1加密 string tmpStr = string.Join("", ArrTmp); tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1"); tmpStr = tmpStr.ToLower(); //3.开发者获得加密后的字符串可与signature对比，标识该请求来源于微信。 if (tmpStr == signature) { return true; } else { return false; } }  /// <summary> /// 消息回复(微信信息返回) /// </summary> /// <param name="requestXML">The request XML.</param> private void ResponseMsg(RequestXML requestXML) { try { string resxml = ""; //主要是调用数据库进行关键词匹配自动回复内容，可以根据自己的业务情况编写。 //1.通常有，没有匹配任何指令时，返回帮助信息 AutoResponse mi = new AutoResponse(requestXML.Content, requestXML.FromUserName);  switch (requestXML.MsgType) { case "text": //在这里执行一系列操作，从而实现自动回复内容. string _reMsg = mi.GetReMsg(); if (mi.msgType == 1) { resxml = "<xml><ToUserName><![CDATA[" + requestXML.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + requestXML.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[news]]></MsgType><Content><![CDATA[]]></Content><ArticleCount>2</ArticleCount><Articles>"; resxml += mi.GetRePic(requestXML.FromUserName); resxml += "</Articles><FuncFlag>1</FuncFlag></xml>"; } else { resxml = "<xml><ToUserName><![CDATA[" + requestXML.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + requestXML.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[" + _reMsg + "]]></Content><FuncFlag>1</FuncFlag></xml>"; } break; case "location": string city = GetMapInfo(requestXML.Location_X, requestXML.Location_Y); if (city == "0") { resxml = "<xml><ToUserName><![CDATA[" + requestXML.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + requestXML.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[好啦，我们知道您的位置啦。您可以:" + mi.GetDefault() + "]]></Content><FuncFlag>1</FuncFlag></xml>"; } else { resxml = "<xml><ToUserName><![CDATA[" + requestXML.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + requestXML.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[好啦，我们知道您的位置啦。您可以:" + mi.GetDefault() + "]]></Content><FuncFlag>1</FuncFlag></xml>"; } break; case "image": //图文混合的消息 具体格式请见官方API“回复图文消息” break; }  System.Web.HttpContext.Current.Response.Write(resxml); WriteToDB(requestXML, resxml, mi.pid); } catch (Exception ex) { //WriteTxt("异常：" + ex.Message + "Struck:" + ex.StackTrace.ToString()); //wx_logs.MyInsert("异常：" + ex.Message + "Struck:" + ex.StackTrace.ToString()); } }   /// <summary> /// unix时间转换为datetime /// </summary> /// <param name="timeStamp"></param> /// <returns></returns> private DateTime UnixTimeToTime(string timeStamp) { DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1)); long lTime = long.Parse(timeStamp + "0000000"); TimeSpan toNow = new TimeSpan(lTime); return dtStart.Add(toNow); }   /// <summary> /// datetime转换为unixtime /// </summary> /// <param name="time"></param> /// <returns></returns> private int ConvertDateTimeInt(System.DateTime time) { System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); return (int)(time - startTime).TotalSeconds; }   /// <summary> /// 调用百度地图，返回坐标信息 /// </summary> /// <param name="y">经度</param> /// <param name="x">纬度</param> /// <returns></returns> public string GetMapInfo(string x, string y) { try { string res = string.Empty; string parame = string.Empty; string url = "http://maps.googleapis.com/maps/api/geocode/xml";  parame = "latlng=" + x + "," + y + "&language=zh-CN&sensor=false";//此key为个人申请 res = webRequestPost(url, parame);  XmlDocument doc = new XmlDocument(); doc.LoadXml(res);  XmlElement rootElement = doc.DocumentElement; string Status = rootElement.SelectSingleNode("status").InnerText;  if (Status == "OK") { //仅获取城市 XmlNodeList xmlResults = rootElement.SelectSingleNode("/GeocodeResponse").ChildNodes; for (int i = 0; i < xmlResults.Count; i++) { XmlNode childNode = xmlResults[i]; if (childNode.Name == "status") { continue; } string city = "0"; for (int w = 0; w < childNode.ChildNodes.Count; w++) { for (int q = 0; q < childNode.ChildNodes[w].ChildNodes.Count; q++) { XmlNode childeTwo = childNode.ChildNodes[w].ChildNodes[q]; if (childeTwo.Name == "long_name") { city = childeTwo.InnerText; } else if (childeTwo.InnerText == "locality") { return city; } } } return city; } } } catch (Exception ex) { //WriteTxt("map异常:" + ex.Message.ToString() + "Struck:" + ex.StackTrace.ToString()); return "0"; } return "0"; }   /// <summary> /// Post 提交调用抓取 /// </summary> /// <param name="url">提交地址</param> /// <param name="param">参数</param> /// <returns>string</returns> public string webRequestPost(string url, string param) { byte[] bs = System.Text.Encoding.UTF8.GetBytes(param); HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url + "?" + param); req.Method = "Post"; req.Timeout = 120 * 1000; req.ContentType = "application/x-www-form-urlencoded;"; req.ContentLength = bs.Length;  using (Stream reqStream = req.GetRequestStream()) { reqStream.Write(bs, 0, bs.Length); reqStream.Flush(); }  using (WebResponse wr = req.GetResponse()) { //在这里对接收到的页面内容进行处理 Stream strm = wr.GetResponseStream(); StreamReader sr = new StreamReader(strm, System.Text.Encoding.UTF8);  string line; System.Text.StringBuilder sb = new System.Text.StringBuilder(); while ((line = sr.ReadLine()) != null) { sb.Append(line + System.Environment.NewLine); } sr.Close(); strm.Close(); return sb.ToString(); } }  /// <summary> /// 将本次交互信息保存至数据库中 /// </summary> /// <param name="requestXML"></param> /// <param name="_xml"></param> /// <param name="_pid"></param> private void WriteToDB(RequestXML requestXML, string _xml, int _pid) { WeiXinMsg wx = new WeiXinMsg(); wx.FromUserName = requestXML.FromUserName; wx.ToUserName = requestXML.ToUserName; wx.MsgType = requestXML.MsgType; wx.Msg = requestXML.Content; wx.Creatime = requestXML.CreateTime; wx.Location_X = requestXML.Location_X; wx.Location_Y = requestXML.Location_Y; wx.Label = requestXML.Label; wx.Scale = requestXML.Scale; wx.PicUrl = requestXML.PicUrl; wx.reply = _xml; wx.pid = _pid; try { wx.Add(); } catch (Exception ex) { //wx_logs.MyInsert(ex.Message); //ex.message; } } }