小工具：火車票查詢

      今天又到了搶火車票的時候，反正是每次搶票都是傻眼。於是寫個小工具幫助自己查詢火車票，如果有票的話給自己發個郵件提示購買。

一、準備工作

利用firebug等工具，我們可以獲取到當我們單擊查詢時調用的Get請求。

• leftTicketDTO.from_station=TJP              出發站
• leftTicketDTO.to_station=XHP                 到達站
• leftTicketDTO.train_date=2017-09-01      出發日期
• purpose_codes=ADULT                          乘車人類型

 接下來我們要對返回的json進行分析，返回的json如下：

{
  "validateMessagesShowId": "_validatorMessage",
  "status": true,
  "httpstatus": 200,
  "data": {
    "result": [
      "oSIL3O3WIe6kfzF42Zlz%2B%2BsPFUuDm4BbNP13vXPnMnwSVXDgZ03onlMGao1RqJYjWimJDOiBa9Xm%0A59BctbygQhG6xM5mfTPPb9dLuvYg43VQYKGBpYzHere%2B4diEqyOfA64i6OcUFpe8ZJ4ccCEiQK7d%0AsFWdn6qDxY5PDQ2zG%2BCCNeAG216PdgO%2Fv%2F0PIrQTTK%2FTft8oZIxGT9VYlkHeh3TUUdxenyGAts4J%0AJ278LrM%3D|預訂|260000Y5160F|Y516|VVP|ZMP|TXP|XHP|12:46|19:00|06:14|Y|rC9CEREwzGPqGayEjfr9YPwYtGX%2B45X6aKXyL0VaY0Bauu4t|20170901|3|P2|11|19|0|0|||||無||有|||有|||||101020|112",
      "wIpyiHG7PkQUnuOjE7gTxQAW39ihKOVttmAMx1lyhE10OyzjXjCe0EzyOsu28FOvw0Yc6CZF4CAQ%0AhR6L%2BAgyc6ca%2FYubiLZ4HuKw%2B0XmN5Us9fmA%2FajP3P%2FZgSoacqyPHPXEhWZ8pfGWSkmLMRNpisgd%0A48kWkp8rhjVIDljoncMagr6t5il3t5FaP8otqcN4ZtnTL1KfslpZt%2B2gxw7GwNFZH0QGTq2uoIuu%0AnYTSCB11w3Ok|預訂|25000011360J|1136|TJP|WXC|TJP|XHP|20:52|01:55|05:03|Y|ZhbR6hnByAgL1ejqxJ1AIYiWcW2q08ZgO%2Bfk6UjtmX5mYLHGGlNBCiPVZDc%3D|20170901|3|P2|01|04|0|0||||無|||有||無|無|||||10401030|1413",
      "yG8TT6qCWjH0Aa2LVzxfCFGHf2q0syxOx7RfcXmsbFNyfq2VlWOS3q0oODd5tWAY2I5ddZfSBvnl%0A1GT%2BQCpZAhTPSLyRfDKCvwNMykAFe%2BuRULRPxd1WsQ57uIWepqDtElMcpGR8m7HB6KTnlzXXL9te%0AkumIJNMRMtA0ukPZto5G3sOGSSHgmQdcAxRmRdCVBFEsS9dNprjSQBwy%2BsxXq7KfAovJcemtY%2B3H%0AC7Kx4hnW5HXZ|預訂|250000K8880H|K888|TJP|XNO|TJP|XHP|21:38|02:38|05:00|Y|uwEONiPztkLymI5okpF%2FJhWo7bzZA1zPcjbuofQXIXLCubD2gxSlXoz8nI8%3D|20170901|3|PB|01|04|0|0||||無|||有||無|有|||||10401030|1413"
    ],
    "flag": "1",
    "map": {
      "TXP": "天津西",
      "XHP": "宣化",
      "TJP": "天津"
    }
  },
  "messages": [],
  "validateMessages": {}
}

 網頁顯示：

• oSIL3O3WIe6kfzF42Zlz%2B%2BsPFUuDm4BbNP13vXPnMnwSVXDgZ03onlMGao1RqJYjWimJDOiBa9Xm%0A59BctbygQhG6xM5mfTPPb9dLuvYg43VQYKGBpYzHere%2B4diEqyOfA64i6OcUFpe8ZJ4ccCEiQK7d%0AsFWdn6qDxY5PDQ2zG%2BCCNeAG216PdgO%2Fv%2F0PIrQTTK%2FTft8oZIxGT9VYlkHeh3TUUdxenyGAts4J%0AJ278LrM%3D|            未知內容

• 預訂|                 

• 260000Y5160F|

• Y516|              車次

• VVP|               始發站

• ZMP|              終點站

• TXP|               出發站   

• XHP|              到達站

• 12:46|             出發時間  

• 19:00|             到達時間

• 06:14|             歷時

• Y|                   是否有票 N：無票  Y:有票

• rC9CEREwzGPqGayEjfr9YPwYtGX%2B45X6aKXyL0VaY0Bauu4t|           未知內容

• 20170901|     未知內容

• 3|                 未知內容

• P2|               未知內容

• 11|                出發站站序

• 19|               到達站站序

• 0|                未知內容

• 0|                未知內容

• |                  未知內容

• |                  未知內容

• |                  未知內容

• |                   軟卧

• 無|                軟座

• |                   未知內容

• 有|                無座

• |                   硬卧

• |                   未知內容

• 有|                硬座

• |                   二等座

• |                   一等座

• |                   商務座

• |                   未知內容

• 101020|         未知內容

• 112               未知內容

   好了我們的準備工作差不多就這樣了。 

 二、編寫代碼

      現在的任務就是數據的獲取，代碼如下：

        /// <summary>
        /// 車票查詢數據獲取
        /// </summary>
        /// <param name="goTime">出行日期</param>
        /// <param name="fromStationCode">出發站編碼</param>
        /// <param name="toStationCode">到達站編碼</param>
        /// <param name="errorMsg">錯誤消息</param>
        /// <returns></returns>
        public TicketSearchJson GetSearchTicketData(DateTime goTime, string fromStationCode, string toStationCode, ref string errorMsg)
        {
            string srcString = string.Empty;
            try
            {
                using (WebClient client = new WebClient())
                {
                    string url = string.Format("https://kyfw.12306.cn/otn/leftTicket/query?leftTicketDTO.train_date={0}&leftTicketDTO.from_station={1}&leftTicketDTO.to_station={2}&purpose_codes=ADULT",
                        goTime.ToString("yyyy-MM-dd"), fromStationCode, toStationCode);
                    Uri uri = new Uri(url);
                    ServicePointManager.ServerCertificateValidationCallback = ValidateServerCertificate;
                    byte[] responseData = client.DownloadData(uri);
                    srcString = Encoding.UTF8.GetString(responseData);
                    TicketSearchJson ticketSearch = JsonConvert.DeserializeObject<TicketSearchJson>(srcString);
                    return ticketSearch;
                }
            }
            catch (Exception ex)
            {
                errorMsg = ex.Message;
                return null;
            }
        }

        /// <summary>
        /// 伺服器證書回調方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="certificate"></param>
        /// <param name="chain"></param>
        /// <param name="sslPolicyErrors"></param>
        /// <returns></returns>
        private bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
        {
            return true;
        }

   郵件發送功能可見這篇博客：小工具：郵件發送

三、運行截圖

   切勿過於頻繁調用介面！！！