httphelp web自动化

public class HttpHelper
    {
        public static CookieContainer CookieContainers = new CookieContainer();

/// <summary>
        ///
        /// </summary>
        /// <param name="url"></param>
        /// <param name="method">"POST" or "GET"</param>
        /// <param name="data">when the method is "POST", the data will send to web server, if the method is "GET", the data should be string.empty</param>
        /// <returns></returns>
   
        public static string GetPostResponse(string url, string data,string referer)
        {
            StreamReader stReader = null;
            HttpWebRequest request=null;
            HttpWebResponse response=null;
            try
            {

request = (HttpWebRequest)HttpWebRequest.Create(url);
             
                string dataStr = data;
                byte[] postData = Encoding.GetEncoding("GBK").GetBytes(data);

request.Method = "POST";
              
                request.ProtocolVersion = HttpVersion.Version11;
                request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.861.0 Safari/535.2";
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = postData.Length;
                request.Referer = referer;
                request.CookieContainer = CookieContainers;
                request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
                request.Headers.Add("Cache-Control", "max-age=0");
                request.Headers.Add("Accept-Encoding", "gzip,deflate,sdch");
                request.Headers.Add("Accept-Language", "zh-CN,zh;q=0.8");
                request.Headers.Add("Accept-Charset", "GBK,utf-8;q=0.7,*;q=0.3");
                Stream st = request.GetRequestStream();//将st名为写入数据流
                st.Write(postData, 0, postData.Length);//写入st数据流
                st.Close();
                request.AllowAutoRedirect = false;
                response = (HttpWebResponse)request.GetResponse();

st = response.GetResponseStream();
                CookieContainers.Add(response.Cookies);
                if (response.ContentEncoding.ToLower().Contains("gzip"))
                {
                    st = new GZipStream(st, CompressionMode.Decompress, true);
                }

string htmlText;
                stReader = new StreamReader(st, Encoding.GetEncoding("GBK"));
                htmlText = stReader.ReadToEnd();

return htmlText;
            }
           catch (Exception ex)
            {
                                throw ex;
            }
            finally
            {
                stReader.Close();
                response.Close();
            }
        }
        public static string GetResponse(string url, string referer)
        {
            HttpWebRequest request=null;
            HttpWebResponse response=null;
            StreamReader stReader =null;
            try
            {

request = (HttpWebRequest)HttpWebRequest.Create(url);

request.Method = "GET";
                request.ProtocolVersion = HttpVersion.Version11;
                request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.861.0 Safari/535.2";
                request.ContentType = "application/x-www-form-urlencoded";
                if (referer != "")
                {
                    request.Referer = referer;
                }
                request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
                request.CookieContainer = CookieContainers;
                request.Headers.Add("Cache-Control", "max-age=0");

request.Headers.Add("Accept-Encoding", "gzip,deflate,sdch");
                request.Headers.Add("Accept-Language", "zh-CN,zh;q=0.8");
                request.Headers.Add("Accept-Charset", "GBK,utf-8;q=0.7,*;q=0.3");

request.AllowAutoRedirect = false;
                response = (HttpWebResponse)request.GetResponse();
                Stream st = response.GetResponseStream();
                CookieContainers.Add(response.Cookies);
                if (response.ContentEncoding.ToLower().Contains("gzip"))
                {
                    st = new GZipStream(st, CompressionMode.Decompress, true);
                }

string htmlText;
                stReader = new StreamReader(st, Encoding.GetEncoding("GBK"));
                htmlText = stReader.ReadToEnd();

return htmlText;
            }
            catch (Exception ex)
            {
                                throw ex;
            }
            finally
            {
                stReader.Close();
                response.Close();
            }
        }

}