上一篇文章，写了基本框架，可能很多人会觉得晕头转向，这里提供一个简单的例子来予以说明，希望能帮你解开谜团。
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(2).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("101010100", new City() { Code = "101010100", Name = "北京", PinYin = "beijing", FristLetter = "bj" });
mCities.Add("101020100", new City() { Code = "101020100", Name = "上海", PinYin = "shanghai", FristLetter = "sh" });
mCities.Add("101200101", new City() { Code = "101200101", 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() > 0)
{
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 = 2000;
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。