C#模拟网络POST请求

    using System;  
    using System.IO;  
    using System.Net;  
    using System.Text;  
    using System.Collections.Generic;  
    using System.Text.RegularExpressions;  
      
    namespace scan  
    {  
        public class zzHttp  
        {  
            private const string sContentType = "application/x-www-form-urlencoded";  
            private const string sUserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";  
             
            public static string Send(string data,string url)  
            {  
                return Send(Encoding.GetEncoding("UTF-8").GetBytes(data),url);  
            }  
      
            public static string Send(byte[] data,string url)  
            {  
                Stream responseStream;  
                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;  
                if (request == null)  
                {  
                     
                    throw new ApplicationException(string.Format("Invalid url string: {0}",url));  
                }  
                // request.UserAgent = sUserAgent;  
                request.ContentType = sContentType;  
                request.Method = "POST";  
                request.ContentLength = data.Length;  
                Stream requestStream = request.GetRequestStream();  
                requestStream.Write(data,data.Length);  
                requestStream.Close();  
                try  
                {  
                    responseStream = request.GetResponse().GetResponseStream();  
                }  
                catch (Exception exception)  
                {  
                      
                    throw exception;  
                }  
                string str = string.Empty;  
                using (StreamReader reader = new StreamReader(responseStream,Encoding.GetEncoding("UTF-8")))  
                {  
                    str = reader.ReadToEnd();  
                }  
                responseStream.Close();  
                return str;  
            }  
     
            #region 同步通过POST方式发送数据  
            /// <summary>  
            /// 通过POST方式发送数据  
            /// </summary>  
            /// <param name="Url">url</param>  
            /// <param name="postDataStr">Post数据</param>  
            /// <param name="cookie">Cookie容器</param>  
            /// <returns></returns>  
            public string SendDataByPost(string Url,string postDataStr,ref CookieContainer cookie)  
            {  
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);  
                if (cookie.Count == 0)  
                {  
                    request.CookieContainer = new CookieContainer();  
                    cookie = request.CookieContainer;  
                }  
                else  
                {  
                    request.CookieContainer = cookie;  
                }  
                request.Method = "POST";  
                request.ContentType = "application/x-www-form-urlencoded";  
                request.ContentLength = postDataStr.Length;  
                //request.Timeout = 1000;  
                //request.ReadWriteTimeout = 3000;  
                Stream myRequestStream = request.GetRequestStream();  
                StreamWriter myStreamWriter = new StreamWriter(myRequestStream,Encoding.GetEncoding("gb2312"));  
                myStreamWriter.Write(postDataStr);  
                myStreamWriter.Close();  
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();  
                Stream myResponseStream = response.GetResponseStream();  
                StreamReader myStreamReader = new StreamReader(myResponseStream,Encoding.GetEncoding("gb2312"));  
                string retString = myStreamReader.ReadToEnd();  
                myStreamReader.Close();  
                myResponseStream.Close();  
                return retString;  
            }  
     
            #endregion  
            #region 同步通过GET方式发送数据  
            /// <summary>  
            /// 通过GET方式发送数据  
            /// </summary>  
            /// <param name="Url">url</param>  
            /// <param name="postDataStr">GET数据</param>  
            /// <param name="cookie">Cookie容器</param>  
            /// <returns></returns>  
            public string SendDataByGET(string Url,ref CookieContainer cookie)  
            {  
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == "" ? "" : "?") + postDataStr);  
                if (cookie.Count == 0)  
                {  
                    request.CookieContainer = new CookieContainer();  
                    cookie = request.CookieContainer;  
                }  
                else  
                {  
                    request.CookieContainer = cookie;  
                }  
                request.Method = "GET";  
                request.ContentType = "text/html;charset=UTF-8";  
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();  
                Stream myResponseStream = response.GetResponseStream();  
                StreamReader myStreamReader = new StreamReader(myResponseStream,Encoding.GetEncoding("utf-8"));  
                string retString = myStreamReader.ReadToEnd();  
                myStreamReader.Close();  
                myResponseStream.Close();  
                return retString;  
            }  
            #endregion  
      
      
      
            public string zzget(string Url,string getdata,string type)  
            {  
                try  
                {  
                    System.Net.WebRequest wReq = System.Net.WebRequest.Create(Url + (getdata == "" ? "" : "?") + getdata);  
                    // Get the response instance.  
                    wReq.Method = "GET";  
                    wReq.ContentType = "text/html;charset=UTF-8";  
                    System.Net.WebResponse wResp = wReq.GetResponse();  
                    System.IO.Stream respStream = wResp.GetResponseStream();  
                    // Dim reader As StreamReader = New StreamReader(respStream)  
                    using (System.IO.StreamReader reader = new System.IO.StreamReader(respStream,Encoding.GetEncoding(type)))  
                    {  
                        return reader.ReadToEnd();  
                    }  
                }  
                catch (System.Exception ex)  
                {  
                    //errorMsg = ex.Message;  
                }  
                return "";  
            }  
      
            ///<summary>  
            ///采用post发送请求  
            ///</summary>  
            ///<param name="URL">url地址</param>  
            ///<param name="strPostdata">发送的数据</param>  
            ///<returns></returns>  
            public string zzpost(string URL,IDictionary<string,Object> strPostdata,string strEncoding)  
            {  
      
                //IDictionary<string,Object> idc = new Dictionary<string,object>();  
                StringBuilder data = new StringBuilder();  
                foreach (KeyValuePair<string,Object> param in strPostdata)   
                {  
                    data.Append(param.Key).Append("=");  
                    data.Append(param.Value.ToString());  
                    data.Append("&");  
                }  
                data.Remove(data.Length- 1,1);  
                Encoding encoding = Encoding.Default;  
      
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);  
                request.CookieContainer = new CookieContainer();//少了这句就不能登录  
                request.Method = "post";  
                request.Accept = "text/html,application/xhtml+xml,*/*";  
                request.ContentType = "application/x-www-form-urlencoded";  
                byte[] buffer = encoding.GetBytes(data.ToString());  
                request.ContentLength = buffer.Length;  
                request.GetRequestStream().Write(buffer,buffer.Length);  
                /*  
                request.ContentLength = data.Length;  
                Stream myRequestStream = request.GetRequestStream();  
                StreamWriter myStreamWriter = new StreamWriter(myRequestStream,Encoding.GetEncoding("gb2312"));  
                myStreamWriter.Write(data);  
                myStreamWriter.Close();  
                */  
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();  
                using (StreamReader reader = new StreamReader(response.GetResponseStream(),System.Text.Encoding.GetEncoding(strEncoding)))  
                {  
                    return reader.ReadToEnd();  
                }  
      
            }  
      
            /// <summary>  
            /// 清除文本中Html的标签  
            /// </summary>  
            /// <param name="Content"></param>  
            /// <returns></returns>  
            public static string ClearHtml(string Content)  
            {  
                Content = Zxj_ReplaceHtml("&#[^>]*;","",Content);  
                Content = Zxj_ReplaceHtml("</?marquee[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?object[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?param[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?embed[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?table[^>]*>",Content);  
                Content = Zxj_ReplaceHtml(" ",Content);  
                Content = Zxj_ReplaceHtml("</?tr[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?th[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?p[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?a[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?img[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?tbody[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?li[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?span[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?div[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?td[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?script[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("(javascript|jscript|vbscript|vbs):",Content);  
                Content = Zxj_ReplaceHtml("on(mouse|exit|error|click|key)",Content);  
                Content = Zxj_ReplaceHtml("<?xml[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?[a-z]+:[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?font[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?b[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?u[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?i[^>]*>",Content);  
                Content = Zxj_ReplaceHtml("</?strong[^>]*>",Content);  
      
                Content = Zxj_ReplaceHtml(" ",Content);  
                Regex r = new Regex(@"s+");  
                Content = r.Replace(Content,"");  
      
                Content.Trim();  
                string clearHtml = Content;  
                return clearHtml;  
            }  
      
            /// <summary>  
            /// 清除文本中的Html标签  
            /// </summary>  
            /// <param name="patrn">要替换的标签正则表达式</param>  
            /// <param name="strRep">替换为的内容</param>  
            /// <param name="content">要替换的内容</param>  
            /// <returns></returns>  
            private static string Zxj_ReplaceHtml(string patrn,string strRep,string content)  
            {  
                if (string.IsNullOrEmpty(content))  
                {  
                    content = "";  
                }  
                Regex rgEx = new Regex(patrn,RegexOptions.IgnoreCase);  
                string strTxt = rgEx.Replace(content,strRep);  
                return strTxt;  
            }  
      
      
        }  
    }