WebResponse 取出全国省市区的邮编

WebResponse用法（根据省市区地址查询其邮编）：

class Program

    {

        static string url { get; set; }

        static void Main(string[] args)

        {

            StringBuilder sb = new StringBuilder();

            try

            {

                SqlConnection conn = new SqlConnection("自己的数据库连接语句");

                SqlDataAdapter da = new SqlDataAdapter("查询语句", conn);

                DataSet ds = new DataSet();

                Random rd = new Random();

                da.Fill(ds);

                url = "http://opendata.baidu.com/post/s?wd={0}&rn=20";//请求地址

                for (int i = 0; i < ds.Tables[0].Rows.Count; i++)

                {

                    var row = ds.Tables[0].Rows[i];

                    string keyworder = row["ProvinceName"] + " " + row["CityName"] + " " + row["DistrictName"];

                    sb.Append(GetZipCodeSql(keyworder, row["SysNo"].ToString()));



                    Thread.Sleep(rd.Next(0, 1000));//延时

                    if (i != 0 && i % 100 == 0)

                    {

                        WriteTxt(sb.ToString());



                        sb.Clear();

                    }

                    else if (i == ds.Tables[0].Rows.Count - 1)

                    {

                        WriteTxt(sb.ToString());



                        sb.Clear();

                    }

                }

            }

            catch (Exception ex)

            {

                System.Console.WriteLine(ex.Message);

            }

        }

        private static void WriteTxt(string text)

        {

            StreamWriter sw = File.AppendText("D:\\3.txt");//保存输出的位置

            sw.Write(text);

            sw.Close();

        }
　　　　//得到邮编

        private static string GetZipCodeSql(string keyworder, string sysNo)

        {

            StringBuilder sb = new StringBuilder();

            try

            {

                HttpWebRequest httpweb = (HttpWebRequest)WebRequest.Create(

                    new Uri(string.Format(url, HttpUtility.UrlEncode(keyworder, System.Text.Encoding.GetEncoding("GBK"))))

                        );

                WebResponse respon = httpweb.GetResponse();

                StreamReader reader = new StreamReader(respon.GetResponseStream(), Encoding.GetEncoding("GBK"));

                string html = reader.ReadToEnd();

                int statrtIndex = 0;

                int end = 0;

                string code = "";

                statrtIndex = html.IndexOf("<ul><!-- baidu-tc begin -->");

                if (statrtIndex > 0)

                {

                    end = html.IndexOf("</a>", statrtIndex);

                    statrtIndex = html.LastIndexOf("</em>", end);

                    code = Regex.Replace(html.Substring(end - 22, 22), @"[^0-9]", "");

                    //code = html.Substring(end - 6, 6);

                    sb.AppendFormat("UPDATE area SET ZipCode ={0} WHERE SysNo={1};\r\n", code, sysNo);

                }

                respon.Close();

            }

            catch (Exception)

            {

                url = "http://opendata.baidu.com/post/s?wd={0}&p=mini&rn=20";

                GetZipCodeSql(keyworder, sysNo);

            }



            return sb.ToString();

        }

    }

 附：全国省市区.zip