.net開發(fā)微信公眾平臺實例教程

const string Token = "aka";//定義一個局部變量不可以被修改，這里定義的變量要與接口配置信息中填寫的Token一致
protected void Page_Load(object sender, EventArgs e)
{
        string postStr = "";
        Valid();//校驗簽名,當填入的信息提交之后頁面有提示“你已成功成為公眾平臺開發(fā)者，可以使用公眾平臺的開發(fā)功能”這個的時候，接下來你就需要注釋掉這個校驗的方法，使得后面的消息回復得以正常運作
        if (Request.HttpMethod.ToLower() == "post")//當普通微信用戶向公眾賬號發(fā)消息時，微信服務器將POST該消息到填寫的URL上
        {
            postStr = PostInput();
            if (string.IsNullOrEmpty(postStr) == false)
            {
                //WriteLog(postStr,Server);//計入日記
                ResponseMsg(postStr);
            }
        }
}
private void Valid()
{
        string echoStr = Request.QueryString["echoStr"].ToString();
        if (CheckSignature())
        {
            if (!string.IsNullOrEmpty(echoStr))
            {
                Response.Write(echoStr);
                Response.End();
            }
        }
}

/// summary>
/// 驗證微信簽名
/// /summary>
/// returns>/returns>
private bool CheckSignature()
{
        string signature = Request.QueryString["signature"].ToString();
        string timestamp = Request.QueryString["timestamp"].ToString();
        string nonce = Request.QueryString["nonce"].ToString();
        string[] ArrTmp = { Token, timestamp, nonce };
        Array.Sort(ArrTmp);//字典排序
        string tmpStr = string.Join("", ArrTmp);
        tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");//對該字符串進行sha1加密
        tmpStr = tmpStr.ToLower();//對字符串中的字母部分進行小寫轉換，非字母字符不作處理
        //WriteLog(tmpStr, Server);//計入日志
        if (tmpStr == signature)//開發(fā)者獲得加密后的字符串可與signature對比，標識該請求來源于微信。開發(fā)者通過檢驗signature對請求進行校驗，若確認此次GET請求來自微信服務器，請原樣返回echostr參數(shù)內(nèi)容，則接入生效，否則接入失敗
        {
            return true;
        }
        else
            return false;
}

/// summary>
/// 獲取post返回來的數(shù)據(jù)
/// /summary>
/// returns>/returns>
private string PostInput()
{
        Stream s = System.Web.HttpContext.Current.Request.InputStream;
        byte[] b = new byte[s.Length];
        s.Read(b, 0, (int)s.Length);
        return Encoding.UTF8.GetString(b);
}

/// summary>
///返回微信信息結果
/// /summary>
/// param name="weixinXML">/param>
private void ResponseMsg(string weixinXML)
{
        try
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(weixinXML);//讀取XML字符串
            XmlElement rootElement = doc.DocumentElement;

            XmlNode MsgType = rootElement.SelectSingleNode("MsgType");//獲取字符串中的消息類型

            string resxml = "";
            if (MsgType.InnerText == "text")//如果消息類型為文本消息
            {
                var model = new
                {
                    ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText,
                    FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText,
                    CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText,
                    MsgType = MsgType.InnerText,
                    Content = rootElement.SelectSingleNode("Content").InnerText,
                    MsgId = rootElement.SelectSingleNode("MsgId").InnerText
                };
                resxml += "xml>ToUserName>![CDATA[" + model.FromUserName + "]]>/ToUserName>FromUserName>![CDATA[" + model.ToUserName + "]]>/FromUserName>CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "/CreateTime>";
                if (!string.IsNullOrEmpty(model.Content))//如果接收到消息
                {
                    if (model.Content.Contains(" 你好") || model.Content.Contains(" 好") || model.Content.Contains("hi") || model.Content.Contains("hello"))// 你好
                    {
                        resxml += "MsgType>![CDATA[text]]>/MsgType>Content>![CDATA[你好，有事請留言，偶會及時回復你的。]]>/Content>FuncFlag>0/FuncFlag>/xml>";
                    }

                 }

                 else//沒有接收到消息
                {
                    resxml += "MsgType>![CDATA[text]]>/MsgType>Content>![CDATA[親，感謝您對我的關注，有事請留言。]]>/Content>FuncFlag>0/FuncFlag>/xml>";
                }

                Response.Write(resxml);
            }
            if (MsgType.InnerText == "image")//如果消息類型為圖片消息
            {
                var model = new
                {
                    ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText,
                    FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText,
                    CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText,
                    MsgType = MsgType.InnerText,
                    PicUrl = rootElement.SelectSingleNode("PicUrl").InnerText,
                    MsgId = rootElement.SelectSingleNode("MsgId").InnerText
                };
                resxml += "xml>ToUserName>![CDATA[" + model.FromUserName + "]]>/ToUserName>FromUserName>![CDATA[" + model.ToUserName + "]]>/FromUserName>CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "/CreateTime>MsgType>![CDATA[news]]>/MsgType>ArticleCount>1/ArticleCount>Articles>item>Title>![CDATA[歡迎您的光臨！]]>/Title>Description>![CDATA[非常感謝您的關注！]]>/Description>PicUrl>![CDATA[http://...jpg]]>/PicUrl>Url>![CDATA[http://www.baidu.com/]]>/Url>/item>/Articles>FuncFlag>0/FuncFlag>/xml>";
                Response.Write(resxml);
            }
            else//如果是其余的消息類型
            {
                var model = new
                {
                    ToUserName = rootElement.SelectSingleNode("ToUserName").InnerText,
                    FromUserName = rootElement.SelectSingleNode("FromUserName").InnerText,
                    CreateTime = rootElement.SelectSingleNode("CreateTime").InnerText,
                };
                resxml += "xml>ToUserName>![CDATA[" + model.FromUserName + "]]>/ToUserName>FromUserName>![CDATA[" + model.ToUserName + "]]>/FromUserName>CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "/CreateTime>MsgType>![CDATA[text]]>/MsgType>Content>![CDATA[親，感謝您對我的關注，有事請留言，我會及時回復你的哦。]]>/Content>FuncFlag>0/FuncFlag>/xml>";
                Response.Write(resxml);
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }
        Response.End();

}
/// summary>
/// datetime轉換成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>
/// 寫日志(用于跟蹤)，可以將想打印出的內(nèi)容計入一個文本文件里面，便于測試
/// /summary>
public static void WriteLog(string strMemo, HttpServerUtility server)
{
        string filename = server.MapPath("/logs/log.txt");//在網(wǎng)站項目中建立一個文件夾命名logs（然后在文件夾中隨便建立一個web頁面文件，避免網(wǎng)站在發(fā)布到服務器之后看不到預定文件）
        if (!Directory.Exists(server.MapPath("http://logs//")))
            Directory.CreateDirectory("http://logs//");
        StreamWriter sr = null;
        try
        {
            if (!File.Exists(filename))
            {
                sr = File.CreateText(filename);
            }
            else
            {
                sr = File.AppendText(filename);
            }
            sr.WriteLine(strMemo);
        }
        catch
        {
        }
        finally
        {
            if (sr != null)
                sr.Close();
        }
}