筛选网页信息获取天气预报

 

最近做学生在线的首页，需要调用天气预报。一般情况下我们我们常常用提供商的WebSerivce。
但学生在线是用的教育网调用WebSerivce常常出现问题，我参考翔工作室技术部老源码，于是做了个网页信息的过滤成功的获取了天气信息！ 

  /// <summary>
        /// 天气预报
        /// </summary>
        private static  void GetTian7OnlineWeather()
        {
            try
            {

                WebRequest wreq = WebRequest.Create("http://www.t7online.com/karten/html/JSU00.htm");

                HttpWebResponse wresp = (HttpWebResponse)wreq.GetResponse();

                string HTML = "";
                Stream s = wresp.GetResponseStream();

                StreamReader objReader = new StreamReader(s, System.Text.Encoding.Default);
                HTML = objReader.ReadToEnd();
                if (HTML == null || HTML == "")
                    return;

                string AllWeather = "", lowest1, lowest2, highest1, highest2, morning1, morning2, afternoon1, afternoon2, night1, night2;
                int start, stop;
                //HTML=HTML.ToLower();
                //取得城市天气的地址
                start = HTML.IndexOf("徐州", 0);
                start = HTML.IndexOf("href="", start);
                stop = HTML.IndexOf(""", start + 6);
                string href = HTML.Substring(start + 6, stop - start - 6);
                //获取页面数据
                href = "http://www.t7online.com" + href;
                wreq = WebRequest.Create(href);
                wresp = (HttpWebResponse)wreq.GetResponse();

                HTML = "";
                s = wresp.GetResponseStream();

                objReader = new StreamReader(s, System.Text.Encoding.Default);
                HTML = objReader.ReadToEnd();
                if (HTML == null || HTML == "")
                    return;
                HTML = HTML.ToLower();

                start = HTML.IndexOf("最低<br>温度", 0);
                start = HTML.IndexOf("<b>", start);
                stop = HTML.IndexOf("</b>", start);
                lowest1 = HTML.Substring(start + 3, stop - start - 3);

                start = HTML.IndexOf("<b>", stop);
                stop = HTML.IndexOf("</b>", start);
                lowest2 = HTML.Substring(start + 3, stop - start - 3);

                start = HTML.IndexOf("最高<br>温度", 0);
                start = HTML.IndexOf("<b>", start);
                stop = HTML.IndexOf("</b>", start);
                highest1 = HTML.Substring(start + 3, stop - start - 3);

                start = HTML.IndexOf("<b>", stop);
                stop = HTML.IndexOf("</b>", start);
                highest2 = HTML.Substring(start + 3, stop - start - 3);

                start = HTML.IndexOf("上午", 0);
                start = HTML.IndexOf("title="", start);
                stop = HTML.IndexOf(""", start + 7);
                morning1 = HTML.Substring(start + 7, stop - start - 7);

                start = HTML.IndexOf("title="", start);
                stop = HTML.IndexOf(""", start + 7);
                morning2 = HTML.Substring(start + 7, stop - start - 7);

                start = HTML.IndexOf("下午", 0);
                start = HTML.IndexOf("title="", start);
                stop = HTML.IndexOf(""", start + 7);
                afternoon1 = HTML.Substring(start + 7, stop - start - 7);

                start = HTML.IndexOf("title="", start);
                stop = HTML.IndexOf(""", start + 7);
                afternoon2 = HTML.Substring(start + 7, stop - start - 7);

                start = HTML.IndexOf("晚上", 0);
                start = HTML.IndexOf("title="", start);
                stop = HTML.IndexOf(""", start + 7);
                night1 = HTML.Substring(start + 7, stop - start - 7);

                start = HTML.IndexOf("title="", start);
                stop = HTML.IndexOf(""", start + 7);
                night2 = HTML.Substring(start + 7, stop - start - 7);

                lowest1.Replace("<font color="#0060ff">", "");
                lowest1.Replace("</font>", "");
                highest1 = highest1.Replace("<font face="夹发砰" size="2"><font color="#ff0000">", "");
                highest1 = highest1.Replace("</font>", "");
                lowest2.Replace("<font color="#0060ff">", "");
                lowest2.Replace("</font>", "");
                highest2 = highest1.Replace("<font face="夹发砰" size="2"><font color="#ff0000">", "");
                highest2 = highest1.Replace("</font>", "");

                AllWeather = "<Table> <Title>今日天气</Title> <Lowest>" + lowest1 + "</Lowest> <Highest>" + highest1 + "</Highest> <Morning>" + morning1 + "</Morning> <Afternoon>" + afternoon1 + "</Afternoon> <Night>" + night1 + "</Night> </Table> ";
                AllWeather = AllWeather + "<Table> <Title>明日天气</Title> <Lowest>" + lowest2 + "</Lowest> <Highest>" + highest2 + "</Highest> <Morning>" + morning2 + "</Morning> <Afternoon>" + afternoon2 + "</Afternoon> <Night>" + night2 + "</Night> </Table>";
                AllWeather = AllWeather.Replace("&deg;", "°");
                AllWeather = "<?xml version="1.0" encoding="gb2312" ?>  <weather> " + AllWeather + " </weather>";
                string path = @"OnlineWeather.xml";
                FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write);
                StreamWriter writer = new StreamWriter(fs, Encoding.Default);
                writer.WriteLine(AllWeather);
                writer.Close();
                fs.Close();
            }
            catch
            {
                System.Console.WriteLine("网络连接失败！");
                System.Console.ReadLine();
                return;
            }
        }
    }