.NET微信开发之公众号消息处理的代码示例

微信公众平台的消息处理还是比较完善的，有最基本的文本消息，到图文消息，到图片消息，语音消息，视频消息，音乐消息其基本原理都是一样的，只不过所post的xml数据有所差别，在处理消息之前，我们要认真阅读，官方给我们的文档：mp.weixin.qq.com/wiki/14/89b871b5466b19b3efa4ada8e577d45e.html。首先我们从最基本的文本消息处理开始。

<xml><ToUserName><![CDATA[toUser]]></ToUserName><FromUserName><![CDATA[fromUser]]></FromUserName><CreateTime>12345678</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[你好]]></Content></xml>

我们可以看到这是消息处理的一个最基本的模式，有发送者，接受者，创建时间，类型，内容等等。

首先我们来创建一个消息处理的类，这个类用来捕获，所有的消息请求，根据不同的消息请求类型来处理不同的消息回复。

public class WeiXinService  {    /// <summary>    /// TOKEN    /// </summary>    private const string TOKEN = "finder";    /// <summary>    /// 签名    /// </summary>    private const string SIGNATURE = "signature";    /// <summary>    /// 时间戳    /// </summary>    private const string TIMESTAMP = "timestamp";    /// <summary>    /// 随机数    /// </summary>    private const string NONCE = "nonce";    /// <summary>    /// 随机字符串    /// </summary>    private const string ECHOSTR = "echostr";    /// <summary>    ///     /// </summary>    private HttpRequest Request { get; set; }    /// <summary>    /// 构造函数    /// </summary>    /// <param name="request"></param>    public WeiXinService(HttpRequest request)    {      this.Request = request;    }    /// <summary>    /// 处理请求，产生响应    /// </summary>    /// <returns></returns>    public string Response()    {      string method = Request.HttpMethod.ToUpper();      //验证签名      if (method == "GET")      {        if (CheckSignature())        {          return Request.QueryString[ECHOSTR];        }        else        {          return "error";        }      }      //处理消息      if (method == "POST")      {        return ResponseMsg();      }      else      {        return "无法处理";      }    }    /// <summary>    /// 处理请求    /// </summary>    /// <returns></returns>    private string ResponseMsg()    {      string requestXml = CommonWeiXin.ReadRequest(this.Request);      IHandler handler = HandlerFactory.CreateHandler(requestXml);         if (handler != null)      {        return handler.HandleRequest();      }      return string.Empty;    }    /// <summary>    /// 检查签名    /// </summary>    /// <param name="request"></param>    /// <returns></returns>    private bool CheckSignature()    {      string signature = Request.QueryString[SIGNATURE];      string timestamp = Request.QueryString[TIMESTAMP];      string nonce = Request.QueryString[NONCE];      List<string> list = new List<string>();      list.Add(TOKEN);      list.Add(timestamp);      list.Add(nonce);      //排序      list.Sort();      //拼串      string input = string.Empty;      foreach (var item in list)      {        input += item;      }      //加密      string new_signature = SecurityUtility.SHA1Encrypt(input);      //验证      if (new_signature == signature)      {        return true;      }      else      {        return false;      }    }  }

在来看看我们的首先是如何捕获消息的。首页Default.ashx的代码如下

    public void ProcessRequest(HttpContext context)    {      context.Response.ContentType = "text/html";            string postString = string.Empty;      if (HttpContext.Current.Request.HttpMethod.ToUpper() == "POST")      {        //由微信服务接收请求，具体处理请求        WeiXinService wxService = new WeiXinService(context.Request);        string responseMsg = wxService.Response();        context.Response.Clear();        context.Response.Charset = "UTF-8";        context.Response.Write(responseMsg);        context.Response.End();      }      else      {        string token = "wei2414201";        if (string.IsNullOrEmpty(token))        {          return;        }        string echoString = HttpContext.Current.Request.QueryString["echoStr"];        string signature = HttpContext.Current.Request.QueryString["signature"];        string timestamp = HttpContext.Current.Request.QueryString["timestamp"];        string nonce = HttpContext.Current.Request.QueryString["nonce"];        if (!string.IsNullOrEmpty(echoString))        {          HttpContext.Current.Response.Write(echoString);          HttpContext.Current.Response.End();        }      }    }

从上面的代码中我们可以看到WeiXinService.cs类中的消息相应至关重要。

    /// <summary>    /// 处理请求    /// </summary>    /// <returns></returns>    private string ResponseMsg()    {      string requestXml = CommonWeiXin.ReadRequest(this.Request);      IHandler handler = HandlerFactory.CreateHandler(requestXml);         if (handler != null)      {        return handler.HandleRequest();      }      return string.Empty;    }

IHandler是一个消息处理接口，其下面有EventHandler，TextHandler处理类实现这个接口。代码如下

  /// <summary>  /// 处理接口  /// </summary>  public interface IHandler  {    /// <summary>    /// 处理请求    /// </summary>    /// <returns></returns>    string HandleRequest();  }

EventHandler

class EventHandler : IHandler  {    /// <summary>    /// 请求的xml    /// </summary>    private string RequestXml { get; set; }    /// <summary>    /// 构造函数    /// </summary>    /// <param name="requestXml"></param>    public EventHandler(string requestXml)    {      this.RequestXml = requestXml;    }    /// <summary>    /// 处理请求    /// </summary>    /// <returns></returns>    public string HandleRequest()    {      string response = string.Empty;      EventMessage em = EventMessage.LoadFromXml(RequestXml);      if (em.Event.Equals("subscribe", StringComparison.OrdinalIgnoreCase))//用来判断是不是首次关注      {        PicTextMessage tm = new PicTextMessage();//我自己创建的一个图文消息处理类        tm.ToUserName = em.FromUserName;        tm.FromUserName = em.ToUserName;        tm.CreateTime = CommonWeiXin.GetNowTime();        response = tm.GenerateContent();      }      return response;    }  }

TextHandler

  /// <summary>  /// 文本信息处理类  /// </summary>  public class TextHandler : IHandler  {    string openid { get; set; }    string access_token { get; set; }    /// <summary>    /// 请求的XML    /// </summary>    private string RequestXml { get; set; }    /// <summary>    /// 构造函数    /// </summary>    /// <param name="requestXml">请求的xml</param>    public TextHandler(string requestXml)    {      this.RequestXml = requestXml;    }    /// <summary>    /// 处理请求    /// </summary>    /// <returns></returns>    public string HandleRequest()    {      string response = string.Empty;      TextMessage tm = TextMessage.LoadFromXml(RequestXml);      string content = tm.Content.Trim();      if (string.IsNullOrEmpty(content))      {        response = "您什么都没输入，没法帮您啊。";      }      else      {          string username = System.Configuration.ConfigurationManager.AppSettings["weixinid"].ToString();          AccessToken token = AccessToken.Get(username);          access_token = token.access_token;          openid = tm.FromUserName;          response = HandleOther(content);              }      tm.Content = response;      //进行发送者、接收者转换      string temp = tm.ToUserName;      tm.ToUserName = tm.FromUserName;      tm.FromUserName = temp;      response = tm.GenerateContent();      return response;    }    /// <summary>    /// 处理其他消息    /// </summary>    /// <param name="tm"></param>    /// <returns></returns>    private string HandleOther(string requestContent)    {      string response = string.Empty;      if (requestContent.Contains("你好") || requestContent.Contains("您好"))      {        response = "您也好~";      }else if (requestContent.Contains("openid") || requestContent.Contains("id") || requestContent.Contains("ID"))//用来匹配用户输入的关键字      {        response = "你的Openid: "+openid;      }      else if (requestContent.Contains("token") || requestContent.Contains("access_token"))      {        response = "你的access_token: " + access_token;      }else       {        response = "试试其他关键字吧。";      }      return response;    }  }

HandlerFactory

  /// <summary>  /// 处理器工厂类  /// </summary>  public class HandlerFactory  {    /// <summary>    /// 创建处理器    /// </summary>    /// <param name="requestXml">请求的xml</param>    /// <returns>IHandler对象</returns>    public static IHandler CreateHandler(string requestXml)    {      IHandler handler = null;      if (!string.IsNullOrEmpty(requestXml))      {        //解析数据        XmlDocument doc = new System.Xml.XmlDocument();        doc.LoadXml(requestXml);        XmlNode node = doc.SelectSingleNode("/xml/MsgType");        if (node != null)        {          XmlCDataSection section = node.FirstChild as XmlCDataSection;          if (section != null)          {            string msgType = section.Value;            switch (msgType)            {              case "text":                handler = new TextHandler(requestXml);                break;              case "event":                handler = new EventHandler(requestXml);                break;            }          }        }      }      return handler;    }  }

在这里基本的一些类已经完成了，现在我们来完成，关注我们的微信公众号，我们就发送一条图文消息，同时输入我们的一些关键字，返回一些消息，比如输入id返回用户的openid等等。

二.PicTextMessage

public class PicTextMessage : Message  {    /// <summary>    /// 模板静态字段    /// </summary>    private static string m_Template;    /// <summary>    /// 默认构造函数    /// </summary>    public PicTextMessage()    {      this.MsgType = "news";    }    /// <summary>    /// 从xml数据加载文本消息    /// </summary>    /// <param name="xml"></param>    public static PicTextMessage LoadFromXml(string xml)    {      PicTextMessage tm = null;      if (!string.IsNullOrEmpty(xml))      {        XElement element = XElement.Parse(xml);        if (element != null)        {          tm = new PicTextMessage();          tm.FromUserName = element.Element(CommonWeiXin.FROM_USERNAME).Value;          tm.ToUserName = element.Element(CommonWeiXin.TO_USERNAME).Value;          tm.CreateTime = element.Element(CommonWeiXin.CREATE_TIME).Value;        }      }      return tm;    }    /// <summary>    /// 模板    /// </summary>    public override string Template    {      get      {        if (string.IsNullOrEmpty(m_Template))        {          LoadTemplate();        }        return m_Template;      }    }    /// <summary>    /// 生成内容    /// </summary>    /// <returns></returns>    public override string GenerateContent()    {      this.CreateTime = CommonWeiXin.GetNowTime();      string str= string.Format(this.Template, this.ToUserName, this.FromUserName, this.CreateTime);      return str;    }    /// <summary>    /// 加载模板    /// </summary>    private static void LoadTemplate()    {      m_Template= @"<xml>              <ToUserName><![CDATA[{0}]]></ToUserName>              <FromUserName><![CDATA[{1}]]></FromUserName>              <CreateTime>{2}</CreateTime>              <MsgType><![CDATA[news]]></MsgType>              <ArticleCount>1</ArticleCount>              <Articles>                <item>                <Title><![CDATA[有位停车欢迎你！]]></Title>                 <Description><![CDATA[如有问题请致电400-6238-136或直接在微信留言，我们将第一时间为您服务!]]></Description>                <PicUrl><![CDATA[http://www.baidu.com/youwei.jpg]]></PicUrl>                <Url><![CDATA[http://www.baidu.com]]></Url>                </item>              </Articles>            </xml> ";    }  }

最后我们的效果如下所示；

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