微信公众平台

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Xml;
using System.IO;
using System.Text;
using System.Collections.Generic;
using System.Net;


namespace weixin
{
    public partial class index : System.Web.UI.Page
    {
        const string Token = "token"; //与那边填写的token一致
        protected void Page_Load(object sender, EventArgs e)
        {
            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))
                {
                    //封装请求类
                    XmlDocument doc = new XmlDocument();
                    doc.LoadXml(postStr);
                    XmlElement rootElement = doc.DocumentElement;


                    XmlNode MsgType = rootElement.SelectSingleNode("MsgType");


                    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;


                    if (requestXML.MsgType == "text")
                    {
                        requestXML.Content = rootElement.SelectSingleNode("Content").InnerText;
                    }
                    else if (requestXML.MsgType == "location")
                    {
                        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;
                    }
                    else if (requestXML.MsgType == "image")
                    {
                        requestXML.PicUrl = rootElement.SelectSingleNode("PicUrl").InnerText;
                    }


                    //回复消息
                    ResponseMsg(requestXML);
                }
            }
            else
            {
                Valid();
            }
        }


        /// <summary>
        /// 验证微信签名
        /// </summary>
        /// * 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。
        /// <returns></returns>
        private bool CheckSignature()
        {
            string signature = Request.QueryString["signature"];
            string timestamp = Request.QueryString["timestamp"];
            string nonce = Request.QueryString["nonce"];
            string[] ArrTmp = { Token, timestamp, nonce };
            Array.Sort(ArrTmp);     //字典排序
            string tmpStr = string.Join("", ArrTmp);
            tmpStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tmpStr, "SHA1");
            tmpStr = tmpStr.ToLower();
            if (tmpStr == signature)
            {
                return true;
            }
            else
            {
                return false;
            }
        }


        private void Valid()
        {
            string echoStr = Request.QueryString["echoStr"];
            if (CheckSignature())
            {
                if (!string.IsNullOrEmpty(echoStr))
                {
                    Response.Write(echoStr);
                    Response.End();
                }
            }
        }


        /// <summary>
        /// 回复消息(微信信息返回)
        /// </summary>
        /// <param name="weixinXML"></param>
        private void ResponseMsg(RequestXML requestXML)
        {
            try
            {
                string resxml = "";
                if (requestXML.MsgType == "text")
                {
                    resxml = "<xml><ToUserName><![CDATA[" + requestXML.FromUserName + "]]></ToUserName><FromUserName><![CDATA[" + requestXML.ToUserName + "]]></FromUserName><CreateTime>" + ConvertDateTimeInt(DateTime.Now) + "</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[正在建设中，稍等时日，更多精彩……]]></Content><FuncFlag>0</FuncFlag></xml>";
                }
                else if (requestXML.MsgType == "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[Sorry，没有找到" + city + " 的相关产品信息]]></Content><FuncFlag>0</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[Sorry，这是 " + city + " 的产品信息：圈圈叉叉]]></Content><FuncFlag>0</FuncFlag></xml>";
                    }
                }
                else if (requestXML.MsgType == "image")
                {
                    //返回10以内条
                    int size = 10;
                    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>" + size + "</ArticleCount><Articles>";
                    List<string> list = new List<string>();
                    //假如有20条查询的返回结果
                    for (int i = 0; i < 20; i++)
                    {
                        list.Add("1");
                    }
                    string[] piclist = new string[] { "/Abstract_Pencil_Scribble_Background_Vector_main.jpg", "/balloon_tree.jpg", "/bloom.jpg", "/colorful_flowers.jpg", "/colorful_summer_flower.jpg", "/fall.jpg", "/fall_tree.jpg", "/growing_flowers.jpg", "/shoes_illustration.jpg", "/splashed_tree.jpg" };


                    for (int i = 0; i < size && i < list.Count; i++)
                    {
                        resxml += "<item><Title><![CDATA[沈阳-黑龙江]]></Title><Description><![CDATA[元旦特价：￥300 市场价：￥400]]></Description><PicUrl><![CDATA[" + "http://www.hougelou.com" + piclist[i] + "]]></PicUrl><Url><![CDATA[http://www.hougelou.com]]></Url></item>";
                    }
                    resxml += "</Articles><FuncFlag>1</FuncFlag></xml>";
                }
                WriteTxt(resxml);
                Response.Write(resxml);
            }
            catch (Exception ex)
            {
                WriteTxt("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>
        /// 记录bug，以便调试
        /// </summary>
        /// <returns></returns>
        public bool WriteTxt(string str)
        {
            try
            {
                FileStream fs = new FileStream(Server.MapPath("/bugLog.txt"), FileMode.Append);
                StreamWriter sw = new StreamWriter(fs);
                //开始写入
                sw.WriteLine(str);
                //清空缓冲区
                sw.Flush();
                //关闭流
                sw.Close();
                fs.Close();
            }
            catch (Exception)
            {
                return false;
            }
            return true;
        }


        /// <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();
            }
        }




    }


    //微信请求类
    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; }
        }
    }
}