下载地址：http://www.cckan.net/thread-3-1-1.html
欢迎大家使用，写了这么久终于可以发布一个版本了。大家快下载试试吧。
功能说明：
1.实现常规的POST和GET请求。
2.实现了可设置编码与无视编码功能，可以自动解析编码。
3.实现了Cookie携带功能。
4.实现了代理请求功能
5.更多的例子请大家到我博客查看
原文地址： http://www.cckan.net/thread-403-1-1.html
发一部分代码给大家看吧
/// <summary> /// 类说明：HttpHelps类，用来实现Http访问，Post或者Get方式的，直接访问，带Cookie的，带证书的等方式，可以设置代理 /// 编码日期：2011-09-20 /// 编 码 人：苏飞 /// 联系方式：361983679 Blogs：http://www.cckan.net /// 修改日期：2012-09-20 /// </summary> using System; using System.Collections.Generic; using System.Text; using System.Net; using System.IO; using System.Text.RegularExpressions; using System.IO.Compression; namespace ImportZhiLian.FunctionServices { public class httphelper { #region 预定义方法或者变更 //默认的编码 public Encoding encoding = Encoding.Default; //HttpWebRequest对象用来发起请求 public HttpWebRequest request = null; //获取影响流的数据对象 private HttpWebResponse response = null; //返回的Cookie public string cookie = ""; //是否设置为全文小写 public Boolean isToLower = true; //读取流的对象 private StreamReader reader = null; //需要返回的数据对象 private string returnData = "String Error"; /// <summary> /// 根据相传入的数据，得到相应页面数据 /// </summary> /// <param name="strPostdata">传入的数据Post方式,get方式传NUll或者空字符串都可以</param> /// <returns>string类型的响应数据</returns> private string GetHttpRequestData(string strPostdata) { try { //支持跳转页面，查询结果将是跳转后的页面 request.AllowAutoRedirect = true; //验证在得到结果时是否有传入数据 if (!string.IsNullOrEmpty(strPostdata) && request.Method.Trim().ToLower().Contains("post")) { byte[] buffer = encoding.GetBytes(strPostdata); request.ContentLength = buffer.Length; request.GetRequestStream().Write(buffer, 0, buffer.Length); } ////最大连接数 //request.ServicePoint.ConnectionLimit = 1024; #region 得到请求的response using (response = (HttpWebResponse)request.GetResponse()) { try { cookie = response.Headers["set-cookie"].ToString(); } catch (Exception) { } //从这里开始我们要无视编码了 if (encoding == null) { MemoryStream _stream = new MemoryStream(); if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase)) { //开始读取流并设置编码方式 //new GZipStream(response.GetResponseStream(), CompressionMode.Decompress).CopyTo(_stream, 10240); //.net4.0以下写法 _stream = GetMemoryStream(response.GetResponseStream()); } else { //response.GetResponseStream().CopyTo(_stream, 10240); // .net4.0以下写法 _stream = GetMemoryStream(response.GetResponseStream()); } byte[] RawResponse = _stream.ToArray(); string temp = Encoding.Default.GetString(RawResponse, 0, RawResponse.Length); //<meta(.*?)charset([\s]?)=[^>](.*?)> Match meta = Regex.Match(temp, "<meta([^<]*)charset=([^<]*)[\"']", RegexOptions.IgnoreCase | RegexOptions.Multiline); string charter = (meta.Groups.Count > 2) ? meta.Groups[2].Value : string.Empty; charter = charter.Replace("\"", string.Empty).Replace("'", string.Empty).Replace(";", string.Empty); if (charter.Length > 0) { charter = charter.ToLower().Replace("iso-8859-1", "gbk"); encoding = Encoding.GetEncoding(charter); } else { if (response.CharacterSet.ToLower().Trim() == "iso-8859-1") { encoding = Encoding.GetEncoding("gbk"); } else { if (string.IsNullOrEmpty(response.CharacterSet.Trim())) { encoding = Encoding.UTF8; } else { encoding = Encoding.GetEncoding(response.CharacterSet); } } } returnData = encoding.GetString(RawResponse); } else { if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase)) { //开始读取流并设置编码方式 using (reader = new StreamReader(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress), encoding)) { returnData = reader.ReadToEnd(); } } else { //开始读取流并设置编码方式 using (reader = new StreamReader(response.GetResponseStream(), encoding)) { returnData = reader.ReadToEnd(); } } } } #endregion } catch (WebException ex) { //这里是在发生异常时返回的错误信息 returnData = "String Error"; response = (HttpWebResponse)ex.Response; } if (isToLower) { returnData = returnData.ToLower(); } return returnData; } /// <summary> /// 4.0以下.net版本取水运 /// </summary> /// <param name="streamResponse"></param> private static MemoryStream GetMemoryStream(Stream streamResponse) { MemoryStream _stream = new MemoryStream(); int Length = 256; Byte[] buffer = new Byte[Length]; int bytesRead = streamResponse.Read(buffer, 0, Length); // write the required bytes while (bytesRead > 0) { _stream.Write(buffer, 0, bytesRead); bytesRead = streamResponse.Read(buffer, 0, Length); } return _stream; } /// <summary> /// 为请求准备参数 /// </summary> ///<param name="objhttpItem">参数列表</param> /// <param name="_Encoding">读取数据时的编码方式</param> private void SetRequest(HttpItem objhttpItem) { //初始化对像，并设置请求的URL地址 request = (HttpWebRequest)WebRequest.Create(GetUrl(objhttpItem.URL)); //请求方式Get或者Post request.Method = objhttpItem.Method; //Accept request.Accept = objhttpItem.Accept; //ContentType返回类型 request.ContentType = objhttpItem.ContentType; //UserAgent客户端的访问类型，包括浏览器版本和操作系统信息 request.UserAgent = objhttpItem.UserAgent; if (objhttpItem.Encoding == "NULL") { //读取数据时的编码方式 encoding = null; } else { //读取数据时的编码方式 encoding = System.Text.Encoding.GetEncoding(objhttpItem.Encoding); } //Cookie request.Headers[HttpRequestHeader.Cookie] = objhttpItem.Cookie; //来源地址 request.Referer = objhttpItem.Referer; } /// <summary> /// 设置当前访问使用的代理 /// </summary> /// <param name="userName">代理 服务器用户名</param> /// <param name="passWord">代理 服务器密码</param> /// <param name="ip">代理 服务器地址</param> public void SetWebProxy(string userName, string passWord, string ip) { //设置代理服务器 WebProxy myProxy = new WebProxy(ip, false); //建议连接 myProxy.Credentials = new NetworkCredential(userName, passWord); //给当前请求对象 request.Proxy = myProxy; //设置安全凭证 request.Credentials = CredentialCache.DefaultNetworkCredentials; } #endregion #region 普通类型 /// <summary> /// 传入一个正确或不正确的URl，返回正确的URL /// </summary> /// <param name="URL">url</param> /// <returns> /// </returns> public static string GetUrl(string URL) { if (!(URL.Contains("http://") || URL.Contains("https://"))) { URL = "http://" + URL; } return URL; } ///<summary> ///采用https协议访问网络,根据传入的URl地址，得到响应的数据字符串。 ///</summary> ///<param name="objhttpItem">参数列表</param> ///<returns>String类型的数据</returns> public string GetHtml(HttpItem objhttpItem) { //准备参数 SetRequest(objhttpItem); //调用专门读取数据的类 return GetHttpRequestData(objhttpItem.Postdata); } #endregion } /// <summary> /// Http请求参考类 /// </summary> public class HttpItem { string _URL; /// <summary> /// 请求URL必须填写 /// </summary> public string URL { get { return _URL; } set { _URL = value; } } string _Method = "GET"; /// <summary> /// 请求方式默认为GET方式 /// </summary> public string Method { get { return _Method; } set { _Method = value; } } string _Accept = "text/html, application/xhtml+xml, */*"; /// <summary> /// 请求标头值 默认为text/html, application/xhtml+xml, */* /// </summary> public string Accept { get { return _Accept; } set { _Accept = value; } } string _ContentType = "text/html"; /// <summary> /// 请求返回类型默认 text/html /// </summary> public string ContentType { get { return _ContentType; } set { _ContentType = value; } } string _UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)"; /// <summary> /// 客户端访问信息默认Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0) /// </summary> public string UserAgent { get { return _UserAgent; } set { _UserAgent = value; } } string _Encoding = "NULL"; /// <summary> /// 返回数据编码默认为NUll,可以自动识别 /// </summary> public string Encoding { get { return _Encoding; } set { _Encoding = value; } } string _Postdata; /// <summary> /// Post请求时要发送的Post数据 /// </summary> public string Postdata { get { return _Postdata; } set { _Postdata = value; } } string _Cookie; /// <summary> /// 请求时的Cookie /// </summary> public string Cookie { get { return _Cookie; } set { _Cookie = value; } } string _Referer; /// <summary> /// 来源地址，上次访问地址 /// </summary> public string Referer { get { return _Referer; } set { _Referer = value; } } } }