.net实现微信公众账号接口开发实例代码

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();  
} 

/// <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;  
}  
}  
} 

#region 微信请求类 RequestXML  
/// <summary>  
/// 微信请求类  
/// </summary>  
public class RequestXML  
{  
private string toUserName = "";  
/// <summary>  
/// 消息接收方微信号，一般为公众平台账号微信号  
/// </summary>  
public string ToUserName  
{  
get { return toUserName; }  
set { toUserName = value; }  
}  

private string fromUserName = "";  
/// <summary>  
/// 消息发送方微信号  
/// </summary>  
public string FromUserName  
{  
get { return fromUserName; }  
set { fromUserName = value; }  
}  

private string createTime = "";  
/// <summary>  
/// 创建时间  
/// </summary>  
public string CreateTime  
{  
get { return createTime; }  
set { createTime = value; }  
}  

private string msgType = "";  
/// <summary>  
/// 信息类型 地理位置:location,文本消息:text,消息类型:image  
/// </summary>  
public string MsgType  
{  
get { return msgType; }  
set { msgType = value; }  
}  

private string content = "";  
/// <summary>  
/// 信息内容  
/// </summary>  
public string Content  
{  
get { return content; }  
set { content = value; }  
}  

private string location_X = "";  
/// <summary>  
/// 地理位置纬度  
/// </summary>  
public string Location_X  
{  
get { return location_X; }  
set { location_X = value; }  
}  

private string location_Y = "";  
/// <summary>  
/// 地理位置经度  
/// </summary>  
public string Location_Y  
{  
get { return location_Y; }  
set { location_Y = value; }  
}  

private string scale = "";  
/// <summary>  
/// 地图缩放大小  
/// </summary>  
public string Scale  
{  
get { return scale; }  
set { scale = value; }  
}  

private string label = "";  
/// <summary>  
/// 地理位置信息  
/// </summary>  
public string Label  
{  
get { return label; }  
set { label = value; }  
}  

private string picUrl = "";  
/// <summary>  
/// 图片链接，开发者可以用HTTP GET获取  
/// </summary>  
public string PicUrl  
{  
get { return picUrl; }  
set { picUrl = value; }  
}  
}  
#endregion