C#模擬網絡POST請求

    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, 0, 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 同步通過POST方式發送數據  
        /// <summary>  
        /// 通過POST方式發送數據  
        /// </summary>  
        /// <param name="Url">url</param>  
        /// <param name="postDataStr">Post數據</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 同步通過GET方式發送數據  
        /// <summary>  
        /// 通過GET方式發送數據  
        /// </summary>  
        /// <param name="Url">url</param>  
        /// <param name="postDataStr">GET數據</param>  
        /// <param name="cookie">Cookie容器</param>  
        /// <returns></returns>  
        public string SendDataByGET(string Url, string postDataStr, 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發送請求  
        ///</summary>  
        ///<param name="URL">url地址</param>  
        ///<param name="strPostdata">發送的數據</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();//少了這句就不能登錄  
            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, 0, 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的標簽  
        /// </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("</?th[^>]*>", "", 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("</?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標簽  
        /// </summary>  
        /// <param name="patrn">要替換的標簽正則表達式</param>  
        /// <param name="strRep">替換為的內容</param>  
        /// <param name="content">要替換的內容</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;  
        }  


    }  
}  </pre><br />