微信公众账号开发教程（三） 实例入门：机器人(附源码) ——转自http://www.cnblogs.com/yank/p/3409308.html

一、功能介绍

通过微信公众平台实现在线客服机器人功能。主要的功能包括：简单对话、查询天气等服务。

这里只是提供比较简单的功能，重在通过此实例来说明公众平台的具体研发过程。只是一个简单DEMO，如果需要的话可以在此基础上进行扩展。

当然后续我们还会推出比较复杂的应用实例。

二、具体实现

1、提供访问接口

这里不再赘述，参照上一章，微信公众账号开发教程（二） 基础框架搭建
http://www.cnblogs.com/yank/p/3392394.html

2、签名认证和分发请求

这里不再赘述，参照上一章，微信公众账号开发教程（二） 基础框架搭建
http://www.cnblogs.com/yank/p/3392394.html

3、处理请求，并响应

1）关注

当微信用户关注公众账号时，可以给其适当的提示。可以是欢迎词，可以是帮助提示。

直接上代码：

    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))
            {
                //回复欢迎消息
                TextMessage tm = new TextMessage();
                tm.ToUserName = em.FromUserName;
                tm.FromUserName = em.ToUserName;
                tm.CreateTime = Common.GetNowTime();
                tm.Content = "欢迎您关注***，我是大哥大，有事就问我，呵呵！\n\n";
                response = tm.GenerateContent();
            }

            return response;
        }
    }

2）问候

简单的交流问候，比如你好、帮助等等，跟我们使用微信聊天一样，不过回应是由我们的程序响应。具体功能，可以根据自己的需要进行添加。
微信本来就是沟通的平台。这个案例，可以用于在线服务机器人，类似于淘宝的客服机器人，可是我们这个是微信版的。呵呵
其实，很简单，获取请求消息，根据关键字来匹配回应。当然这里可能要做的工作很多，如何支持智能匹配，如何支持模糊匹配等。

代码如下：

    /// <summary>
    /// 文本信息处理类
    /// </summary>
    public class TextHandler : IHandler
    {
        /// <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
            {
                if (content.StartsWith("tq", StringComparison.OrdinalIgnoreCase))
                {
                    string cityName = content.Substring().Trim();
                    response = WeatherHelper.GetWeather(cityName);
                }
                else
                {
                    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("傻"))
            {
                response = "我不傻！哼~ ";
            }
            else if (requestContent.Contains("逼") || requestContent.Contains("操"))
            {
                response = "哼，你说脏话！ ";
            }
            else if (requestContent.Contains("是谁"))
            {
                response = "我是大哥大，有什么能帮您的吗？~";
            }
            else if (requestContent.Contains("再见"))
            {
                response = "再见！";
            }
            else if (requestContent.Contains("bye"))
            {
                response = "Bye！";
            }
            else if (requestContent.Contains("谢谢"))
            {
                response = "不客气！嘿嘿";
            }
            else if (requestContent == "h" || requestContent == "H" || requestContent.Contains("帮助"))
            {
                response = @"查询天气，输入tq 城市名称\拼音\首字母";
            }
            else
            {
                response = "您说的，可惜，我没明白啊，试试其他关键字吧。";
            }

            return response;
        }
    }

3）查询天气

这个功能需要请求实时查询的，请求官方的天气发布网站，然后解析其返回值，按照我们需要的格式，组织天气信息，最后发送给微信客户。
采用文本消息方式处理。
用户请求，只需输入：tq 城市名称/拼音/首字母，即可获取消息。

回复的消息：（以北京为例）

北京
2013年11月6日 星期三
今天：(17℃~4℃)晴北风4-5级转3-4级4-5级转3-4级
24小时穿衣指数:天气冷，建议着棉服、羽绒服、皮夹克加羊毛衫等冬季服装。年老体弱者宜着厚棉衣、冬大衣或厚羽绒服。
明天：(14℃~3℃)晴转多云微风小于3级
48小时穿衣指数:天气冷，建议着棉服、羽绒服、皮夹克加羊毛衫等冬季服装。年老体弱者宜着厚棉衣、冬大衣或厚羽绒服。

来看源码吧：

    class WeatherHelper
    {
        /// <summary>
        /// 城市集合字段
        /// </summary>
        private static Dictionary<string, City> mCities;
        /// <summary>
        /// 城市集合
        /// </summary>
        public static Dictionary<string, City> Cities
        {
            get
            {
                if (mCities == null)
                {
                    LoadCities();
                }

                return mCities;
            }
        }
        /// <summary>
        /// 加载城市
        /// </summary>
        private static void LoadCities()
        {
            mCities = new Dictionary<string, City>();
            mCities.Clear();
            mCities.Add("", new City() { Code = "", Name = "北京", PinYin = "beijing", FristLetter = "bj" });
            mCities.Add("", new City() { Code = "", Name = "上海", PinYin = "shanghai", FristLetter = "sh" });
            mCities.Add("", new City() { Code = "", Name = "武汉", PinYin = "wuhai", FristLetter = "wh" });

        }
        /// <summary>
        /// 获取城市的天气
        /// </summary>
        /// <param name="name">城市名称、拼音或首字母</param>
        /// <returns></returns>
        public static string GetWeather(string name)
        {
            string result = string.Empty;
            string cityCode = string.Empty;
            //获取城市编码
            IEnumerable<string> codes = from item in Cities
                                        where item.Value != null
                                              && (item.Value.Name.Equals(name, StringComparison.OrdinalIgnoreCase)
                                                    || item.Value.PinYin.Equals(name, StringComparison.OrdinalIgnoreCase)
                                                    || item.Value.FristLetter.Equals(name, StringComparison.OrdinalIgnoreCase))
                                        select item.Value.Code;
            if (codes != null && codes.Count() > )
            {
                cityCode = codes.First<string>();
            }

            //http请求，获取天气
            if (!string.IsNullOrEmpty(cityCode))
            {
                string url = "http://m.weather.com.cn/data/{0}.html";
                url = string.Format(url, cityCode);
                WebRequest request = HttpWebRequest.Create(url);
                //超时时间为：2秒
                request.Timeout = ;
                request.Credentials = CredentialCache.DefaultCredentials;
                WebResponse response = request.GetResponse();
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                string weahterInfo = reader.ReadToEnd();
                if (string.IsNullOrEmpty(weahterInfo))
                {
                    result = "暂时没有取到天气数据,请稍后再试";
                }
                else
                {
                    XmlDocument doc = JsonConvert.DeserializeXmlNode(weahterInfo);
                    if (doc != null)
                    {
                        XmlNode node = doc.DocumentElement;
                        if (node != null)
                        {
                            StringBuilder builder = new StringBuilder();
                            builder.Append(node["city"].InnerText).Append("\n");
                            builder.Append(node["date_y"].InnerText).Append(" ").Append(node["week"].InnerText).Append("\n");
                            builder.Append("今天：").Append("(").Append(node["temp1"].InnerText).Append(")").Append(node["weather1"].InnerText).Append(node["wind1"].InnerText).Append(node["fl1"].InnerText).Append("\n");
                            builder.Append("24小时穿衣指数:").Append(node["index_d"].InnerText).Append("\n");
                            builder.Append("明天：").Append("(").Append(node["temp2"].InnerText).Append(")").Append(node["weather2"].InnerText).Append(node["wind2"].InnerText).Append(node["fl2"].InnerText).Append("\n");
                            builder.Append("48小时穿衣指数:").Append(node["index48_d"].InnerText).Append("\n");
                            result = builder.ToString();
                        }
                    }
                    #region 天气json数据格式
                    /*

                {
   "weatherinfo": {
       "city": "北京",
       "city_en": "beijing",
       "date_y": "2013年11月4日",
       "date": "",
       "week": "星期一",
       "fchh": "11",
       "cityid": "101010100",
       "temp1": "17℃~5℃",
       "temp2": "16℃~5℃",
       "temp3": "18℃~4℃",
       "temp4": "17℃~5℃",
       "temp5": "14℃~6℃",
       "temp6": "14℃~2℃",
       "tempF1": "62.6℉~41℉",
       "tempF2": "60.8℉~41℉",
       "tempF3": "64.4℉~39.2℉",
       "tempF4": "62.6℉~41℉",
       "tempF5": "57.2℉~42.8℉",
       "tempF6": "57.2℉~35.6℉",
       "weather1": "晴转多云",
       "weather2": "多云",
       "weather3": "多云转晴",
       "weather4": "晴转多云",
       "weather5": "多云转阴",
       "weather6": "阴转晴",
       "img1": "0",
       "img2": "1",
       "img3": "1",
       "img4": "99",
       "img5": "1",
       "img6": "0",
       "img7": "0",
       "img8": "1",
       "img9": "1",
       "img10": "2",
       "img11": "2",
       "img12": "0",
       "img_single": "0",
       "img_title1": "晴",
       "img_title2": "多云",
       "img_title3": "多云",
       "img_title4": "多云",
       "img_title5": "多云",
       "img_title6": "晴",
       "img_title7": "晴",
       "img_title8": "多云",
       "img_title9": "多云",
       "img_title10": "阴",
       "img_title11": "阴",
       "img_title12": "晴",
       "img_title_single": "晴",
       "wind1": "微风",
       "wind2": "微风",
       "wind3": "微风",
       "wind4": "微风",
       "wind5": "微风",
       "wind6": "北风4-5级",
       "fx1": "微风",
       "fx2": "微风",
       "fl1": "小于3级",
       "fl2": "小于3级",
       "fl3": "小于3级",
       "fl4": "小于3级",
       "fl5": "小于3级",
       "fl6": "4-5级",
       "index": "较冷",
       "index_d": "建议着大衣、呢外套加毛衣、卫衣等服装。体弱者宜着厚外套、厚毛衣。因昼夜温差较大，注意增减衣服。",
       "index48": "冷",
       "index48_d": "天气冷，建议着棉服、羽绒服、皮夹克加羊毛衫等冬季服装。年老体弱者宜着厚棉衣、冬大衣或厚羽绒服。",
       "index_uv": "中等",
       "index48_uv": "弱",
       "index_xc": "适宜",
       "index_tr": "适宜",
       "index_co": "舒适",
       "st1": "17",
       "st2": "5",
       "st3": "17",
       "st4": "5",
       "st5": "18",
       "st6": "6",
       "index_cl": "适宜",
       "index_ls": "适宜",
       "index_ag": "极不易发"
   }
}
                */
                    #endregion

                }
            }
            else
            {
                result = "没有获取到该城市的天气,请确定输入了正确的城市名称,如\'北京\'或者\'beijing\'或者\'bj\'";
            }

            //返回
            return result;
        }
        /// <summary>
        /// 内部类：城市
        /// </summary>
        internal class City
        {
            /// <summary>
            /// 编码
            /// </summary>
            public string Code { get; set; }
            /// <summary>
            /// 名称
            /// </summary>
            public string Name { get; set; }
            /// <summary>
            /// 拼音
            /// </summary>
            public string PinYin { get; set; }
            /// <summary>
            /// 拼音首字母
            /// </summary>
            public string FristLetter { get; set; }
        }
    }

三、源码

这里可是可执行的代码哦。应大家的需求，这里提供全部的源代码。