.NET微信公眾號開發(fā)之公眾號消息處理

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.NET微信公眾號開發(fā)之公眾號消息處理

.NET微信公眾號開發(fā)之公眾號消息處理:一.前言微信公眾平臺的消息處理還是比較完善的，有最基本的文本消息，到圖文消息，到圖片消息，語音消息，視頻消息，音樂消息其基本原理都是一樣的，只不過所post的xml數(shù)據(jù)有所差別，在處理消息之前，我們要認(rèn)真閱讀，官方給我們的文檔：http://mp.w

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導(dǎo)讀.NET微信公眾號開發(fā)之公眾號消息處理:一.前言微信公眾平臺的消息處理還是比較完善的，有最基本的文本消息，到圖文消息，到圖片消息，語音消息，視頻消息，音樂消息其基本原理都是一樣的，只不過所post的xml數(shù)據(jù)有所差別，在處理消息之前，我們要認(rèn)真閱讀，官方給我們的文檔：http://mp.w

一.前言

微信公眾平臺的消息處理還是比較完善的，有最基本的文本消息，到圖文消息，到圖片消息，語音消息，視頻消息，音樂消息其基本原理都是一樣的，只不過所post的xml數(shù)據(jù)有所差別，在處理消息之前，我們要認(rèn)真閱讀，官方給我們的文檔：http://mp.weixin.qq.com/wiki/14/89b871b5466b19b3efa4ada8e577d45e.html。首先我們從最基本的文本消息處理開始。

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

我們可以看到這是消息處理的一個(gè)最基本的模式，有發(fā)送者，接受者，創(chuàng)建時(shí)間，類型，內(nèi)容等等。

首先我們來創(chuàng)建一個(gè)消息處理的類，這個(gè)類用來捕獲，所有的消息請求，根據(jù)不同的消息請求類型來處理不同的消息回復(fù)。

public class WeiXinService
 {
 /// <summary>
 /// TOKEN
 /// </summary>
 private const string TOKEN = "finder";
 /// <summary>
 /// 簽名
 /// </summary>
 private const string SIGNATURE = "signature";
 /// <summary>
 /// 時(shí)間戳
 /// </summary>
 private const string TIMESTAMP = "timestamp";
 /// <summary>
 /// 隨機(jī)數(shù)
 /// </summary>
 private const string NONCE = "nonce";
 /// <summary>
 /// 隨機(jī)字符串
 /// </summary>
 private const string ECHOSTR = "echostr";
 /// <summary>
 /// 
 /// </summary>
 private HttpRequest Request { get; set; }
 /// <summary>
 /// 構(gòu)造函數(shù)
 /// </summary>
 /// <param name="request"></param>
 public WeiXinService(HttpRequest request)
 {
 this.Request = request;
 }
 /// <summary>
 /// 處理請求，產(chǎn)生響應(yīng)
 /// </summary>
 /// <returns></returns>
 public string Response()
 {
 string method = Request.HttpMethod.ToUpper();
 //驗(yàn)證簽名
 if (method == "GET")
 {
 if (CheckSignature())
 {
 return Request.QueryString[ECHOSTR];
 }
 else
 {
 return "error";
 }
 }

 //處理消息
 if (method == "POST")
 {
 return ResponseMsg();
 }
 else
 {
 return "無法處理";
 }
 }

 /// <summary>
 /// 處理請求
 /// </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>
 /// 檢查簽名
 /// </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);
 //驗(yàn)證
 if (new_signature == signature)
 {
 return true;
 }
 else
 {
 return false;
 }
 }
 }

在來看看我們的首先是如何捕獲消息的。首頁Default.ashx的代碼如下

 public void ProcessRequest(HttpContext context)
 {
 context.Response.ContentType = "text/html";
 

 string postString = string.Empty;
 if (HttpContext.Current.Request.HttpMethod.ToUpper() == "POST")
 {
 //由微信服務(wù)接收請求，具體處理請求
 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();
 }
 }


 }

從上面的代碼中我們可以看到WeiXinService.cs類中的消息相應(yīng)至關(guān)重要。

 /// <summary>
 /// 處理請求
 /// </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是一個(gè)消息處理接口，其下面有EventHandler，TextHandler處理類實(shí)現(xiàn)這個(gè)接口。代碼如下

 /// <summary>
 /// 處理接口
 /// </summary>
 public interface IHandler
 {
 /// <summary>
 /// 處理請求
 /// </summary>
 /// <returns></returns>
 string HandleRequest();
 }

EventHandler

class EventHandler : IHandler
 {
 /// <summary>
 /// 請求的xml
 /// </summary>
 private string RequestXml { get; set; }
 /// <summary>
 /// 構(gòu)造函數(shù)
 /// </summary>
 /// <param name="requestXml"></param>
 public EventHandler(string requestXml)
 {
 this.RequestXml = requestXml;
 }
 /// <summary>
 /// 處理請求
 /// </summary>
 /// <returns></returns>
 public string HandleRequest()
 {
 string response = string.Empty;
 EventMessage em = EventMessage.LoadFromXml(RequestXml);
 if (em.Event.Equals("subscribe", StringComparison.OrdinalIgnoreCase))//用來判斷是不是首次關(guān)注
 {


 PicTextMessage tm = new PicTextMessage();//我自己創(chuàng)建的一個(gè)圖文消息處理類
 tm.ToUserName = em.FromUserName;
 tm.FromUserName = em.ToUserName;
 tm.CreateTime = CommonWeiXin.GetNowTime();
 response = tm.GenerateContent();

 }

 return response;
 }
 }

TextHandler

 /// <summary>
 /// 文本信息處理類
 /// </summary>
 public class TextHandler : IHandler
 {
 string openid { get; set; }
 string access_token { get; set; }

 /// <summary>
 /// 請求的XML
 /// </summary>
 private string RequestXml { get; set; }
 /// <summary>
 /// 構(gòu)造函數(shù)
 /// </summary>
 /// <param name="requestXml">請求的xml</param>
 public TextHandler(string requestXml)
 {
 this.RequestXml = requestXml;
 }
 /// <summary>
 /// 處理請求
 /// </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 = "您什么都沒輸入，沒法幫您啊。";
 }
 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;
 //進(jìn)行發(fā)送者、接收者轉(zhuǎn)換
 string temp = tm.ToUserName;
 tm.ToUserName = tm.FromUserName;
 tm.FromUserName = temp;
 response = tm.GenerateContent();
 return response;
 }
 /// <summary>
 /// 處理其他消息
 /// </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"))//用來匹配用戶輸入的關(guān)鍵字
 {
 response = "你的Openid: "+openid;
 }
 else if (requestContent.Contains("token") || requestContent.Contains("access_token"))
 {
 response = "你的access_token: " + access_token;
 }else 
 {
 response = "試試其他關(guān)鍵字吧。";
 }
 return response;
 }
 }

HandlerFactory

 /// <summary>
 /// 處理器工廠類
 /// </summary>
 public class HandlerFactory
 {
 /// <summary>
 /// 創(chuàng)建處理器
 /// </summary>
 /// <param name="requestXml">請求的xml</param>
 /// <returns>IHandler對象</returns>
 public static IHandler CreateHandler(string requestXml)
 {
 IHandler handler = null;
 if (!string.IsNullOrEmpty(requestXml))
 {
 //解析數(shù)據(jù)
 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;
 }
 }

在這里基本的一些類已經(jīng)完成了，現(xiàn)在我們來完成，關(guān)注我們的微信公眾號，我們就發(fā)送一條圖文消息，同時(shí)輸入我們的一些關(guān)鍵字，返回一些消息，比如輸入id返回用戶的openid等等。

二.PicTextMessage

public class PicTextMessage : Message
 {
 /// <summary>
 /// 模板靜態(tài)字段
 /// </summary>
 private static string m_Template;

 /// <summary>
 /// 默認(rèn)構(gòu)造函數(shù)
 /// </summary>
 public PicTextMessage()
 {
 this.MsgType = "news";
 }
 /// <summary>
 /// 從xml數(shù)據(jù)加載文本消息
 /// </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>
 /// 生成內(nèi)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>
 /// 加載模板
 /// </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[有位停車歡迎你！]]></Title> 
 <Description><![CDATA[如有問題請致電400-6238-136或直接在微信留言，我們將第一時(shí)間為您服務(wù)!]]></Description>
 <PicUrl><![CDATA[http://www.baidu.com/youwei.jpg]]></PicUrl>
 <Url><![CDATA[http://www.baidu.com]]></Url>
 </item>
 </Articles>
 </xml> ";
 }
 }

最后我們的效果如下所示；