<span style="font-family:Microsoft YaHei;">/// <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  /// 更新网址：http://www.cckan.net/thread-3-1-1.html/// 修改日期：2012-12-09/// </summary>using System;using System.Collections.Generic;using System.Text;using System.Net;using System.IO;using System.Text.RegularExpressions;using System.IO.Compression;using System.Security.Cryptography.X509Certificates;using System.Net.Security;namespace DotNet.Utilities{    /// <summary>    /// Http连接操作帮助类     /// <example>    /// 下面是个例子大家可以看一下    ///     ///  HttpHelper http = new HttpHelper();    ///  HttpItem item = new HttpItem()    ///  {    ///   URL = "http://www.cckan.net",//URL     必需项    ///   Encoding = "gbk",//编码格式（utf-8,gb2312,gbk）     可选项 默认类会自动识别    ///   Method = "get",//URL     可选项 默认为Get    ///   //Timeout = 100000,//连接超时时间     可选项默认为100000    ///   //ReadWriteTimeout = 30000,//写入Post数据超时时间     可选项默认为30000    ///   //IsToLower = false,//得到的HTML代码是否转成小写     可选项默认转小写    ///   Cookie = "",//字符串Cookie     可选项    ///   // UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)",//用户的浏览器类型，版本，操作系统     可选项有默认值    ///   // Accept = "text/html, application/xhtml+xml, */*",//    可选项有默认值    ///   // ContentType = "text/html",//返回类型    可选项有默认值    ///   Referer = "http://www.cckan.net",//来源URL     可选项    ///   //Allowautoredirect = true,//是否根据３０１跳转     可选项    ///   //CerPath = "d:\\123.cer",//证书绝对路径     可选项不需要证书时可以不写这个参数    ///   //Connectionlimit = 1024,//最大连接数     可选项 默认为1024    ///   //Postdata = "http://www.mamicode.com/username=sufei&pwd=cckan.net",//Post数据     可选项GET时不需要写    ///   //ProxyIp = "192.168.1.105",//代理服务器ID     可选项 不需要代理 时可以不设置这三个参数    ///   //ProxyPwd = "123456",//代理服务器密码     可选项    ///   // ProxyUserName = "administrator",//代理服务器账户名     可选项    ///  };    ///  //得到HTML代码    ///  string html = http.GetHtml(item);    ///    ///  //取出返回的Cookie    ///  string cookie = item.Cookie;    ///  //取出返回的Request    ///  HttpWebRequest request = item.Request;    ///  //取出返回的Response    ///  HttpWebResponse response = item.Response;    ///  //取出返回的Reader    ///  StreamReader reader = item.Reader;    ///  //取出返回的Headers    ///  WebHeaderCollection header = response.Headers;    /// </example>    /// </summary>    public class HttpHelper    {        #region 预定义方法或者变更        //默认的编码        private Encoding encoding = Encoding.Default;        //HttpWebRequest对象用来发起请求        private HttpWebRequest request = null;        //获取影响流的数据对象        private HttpWebResponse response = null;        //读取流的对象        private StreamReader reader = null;        //需要返回的数据对象        private string returnData = http://www.mamicode.com/"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(HttpItem objhttpitem)        {            try            {                #region 得到请求的response                using (response = (HttpWebResponse)request.GetResponse())                {                    if (response.Cookies != null)                    {                        objhttpitem.CookieCollection = response.Cookies;                    }                    if (response.Headers["set-cookie"] != null)                    {                        objhttpitem.Cookie = response.Headers["set-cookie"];                    }                    objhttpitem.Response = response;                    objhttpitem.Request = request;                    //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))                        {                            objhttpitem.Reader = reader;                            //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                        {                            objhttpitem.Reader = reader;                            //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))                            {                                objhttpitem.Reader = reader;                                returnData = reader.ReadToEnd();                            }                        }                        else                        {                            //开始读取流并设置编码方式                            using (reader = new StreamReader(response.GetResponseStream(), encoding))                            {                                objhttpitem.Reader = reader;                                returnData = reader.ReadToEnd();                            }                        }                    }                }                #endregion            }            catch (WebException ex)            {                //这里是在发生异常时返回的错误信息                returnData = http://www.mamicode.com/"String Error";                response = (HttpWebResponse)ex.Response;                objhttpitem.Response = response;            }            if (objhttpitem.IsToLower)            {                returnData = returnData.ToLower();            }            return returnData;        }        /// <summary>        /// 4.0以下.net版本取数据使用        /// </summary>        /// <param name="streamResponse">流</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)        {            #region 验证证书            if (!string.IsNullOrEmpty(objhttpItem.CerPath))            {                //这一句一定要写在创建连接的前面。使用回调的方法进行证书验证。                ServicePointManager.ServerCertificateValidationCallback =                    new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);                //初始化对像，并设置请求的URL地址                request = (HttpWebRequest)WebRequest.Create(GetUrl(objhttpItem.URL));                //创建证书文件                X509Certificate objx509 = new X509Certificate(objhttpItem.CerPath);                //添加到请求里                request.ClientCertificates.Add(objx509);            }            else            {                //初始化对像，并设置请求的URL地址                request = (HttpWebRequest)WebRequest.Create(GetUrl(objhttpItem.URL));            }            #endregion            #region 设置代理            if (string.IsNullOrEmpty(objhttpItem.ProxyUserName) && string.IsNullOrEmpty(objhttpItem.ProxyPwd) && string.IsNullOrEmpty(objhttpItem.ProxyIp))            {                //不需要设置            }            else            {                //设置代理服务器                WebProxy myProxy = new WebProxy(objhttpItem.ProxyIp, false);                //建议连接                myProxy.Credentials = new NetworkCredential(objhttpItem.ProxyUserName, objhttpItem.ProxyPwd);                //给当前请求对象                request.Proxy = myProxy;                //设置安全凭证                request.Credentials = CredentialCache.DefaultNetworkCredentials;            }            #endregion            //请求方式Get或者Post            request.Method = objhttpItem.Method;            request.Timeout = objhttpItem.Timeout;            request.ReadWriteTimeout = objhttpItem.ReadWriteTimeout;            //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;            #region 编码            if (string.IsNullOrEmpty(objhttpItem.Encoding) || objhttpItem.Encoding.ToLower().Trim() == "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);            }            #endregion            #region Cookie            if (!string.IsNullOrEmpty(objhttpItem.Cookie))            {                //Cookie                request.Headers[HttpRequestHeader.Cookie] = objhttpItem.Cookie;            }            //设置Cookie            if (objhttpItem.CookieCollection != null)            {                if (request.CookieContainer.Count == 0)                {                    request.CookieContainer.Add(objhttpItem.CookieCollection);                }                else                {                    request.CookieContainer = new CookieContainer();                    request.CookieContainer.Add(objhttpItem.CookieCollection);                }            }            #endregion            //来源地址            request.Referer = objhttpItem.Referer;            //是否执行跳转功能            request.AllowAutoRedirect = objhttpItem.Allowautoredirect;            #region Post数据            //验证在得到结果时是否有传入数据            if (!string.IsNullOrEmpty(objhttpItem.Postdata) && request.Method.Trim().ToLower().Contains("post"))            {                byte[] buffer = Encoding.Default.GetBytes(objhttpItem.Postdata);                request.ContentLength = buffer.Length;                request.GetRequestStream().Write(buffer, 0, buffer.Length);            }            #endregion            //设置最大连接            if (objhttpItem.Connectionlimit > 0)            {                request.ServicePoint.ConnectionLimit = objhttpItem.Connectionlimit;            }        }        //回调验证证书问题        public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)        {            // 总是接受                return true;        }        #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);        }        #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; }        }        int _Timeout = 100000;        /// <summary>        /// 默认请求超时时间        /// </summary>        public int Timeout        {            get { return _Timeout; }            set { _Timeout = value; }        }        int _ReadWriteTimeout = 30000;        /// <summary>        /// 默认写入Post数据超时间        /// </summary>        public int ReadWriteTimeout        {            get { return _ReadWriteTimeout; }            set { _ReadWriteTimeout = 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 = string.Empty;        /// <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 =http://www.mamicode.com/ value; }        }        string _Cookie = string.Empty;        /// <summary>        /// 请求时的Cookie        /// </summary>        public string Cookie        {            get { return _Cookie; }            set { _Cookie = value; }        }        string _Referer = string.Empty;        /// <summary>        /// 来源地址，上次访问地址        /// </summary>        public string Referer        {            get { return _Referer; }            set { _Referer = value; }        }        string _CerPath = string.Empty;        /// <summary>        /// 证书绝对路径        /// </summary>        public string CerPath        {            get { return _CerPath; }            set { _CerPath = value; }        }        CookieCollection cookiecollection = null;        /// <summary>        /// Cookie对象集合        /// </summary>        public CookieCollection CookieCollection        {            get { return cookiecollection; }            set { cookiecollection = value; }        }        private HttpWebRequest request = null;        /// <summary>        /// HttpWebRequest对象用来发起请求        /// </summary>        public HttpWebRequest Request        {            get { return request; }            set { request = value; }        }        private HttpWebResponse response = null;        /// <summary>        /// 获取影响流的数据对象        /// </summary>        public HttpWebResponse Response        {            get { return response; }            set { response = value; }        }        private Boolean isToLower = true;        /// <summary>        /// 是否设置为全文小写        /// </summary>        public Boolean IsToLower        {            get { return isToLower; }            set { isToLower = value; }        }        private StreamReader reader = null;        /// <summary>        ///  读取流的对象        /// </summary>        public StreamReader Reader        {            get { return reader; }            set { reader = value; }        }        private Boolean allowautoredirect = true;        /// <summary>        /// 支持跳转页面，查询结果将是跳转后的页面        /// </summary>        public Boolean Allowautoredirect        {            get { return allowautoredirect; }            set { allowautoredirect = value; }        }        private int connectionlimit = 1024;        /// <summary>        /// 最大连接数        /// </summary>        public int Connectionlimit        {            get { return connectionlimit; }            set { connectionlimit = value; }        }        private string proxyusername = string.Empty;        /// <summary>        /// 代理Proxy 服务器用户名        /// </summary>        public string ProxyUserName        {            get { return proxyusername; }            set { proxyusername = value; }        }        private string proxypwd = string.Empty;        /// <summary>        /// 代理 服务器密码        /// </summary>        public string ProxyPwd        {            get { return proxypwd; }            set { proxypwd = value; }        }        private string proxyip = string.Empty;        /// <summary>        /// 代理 服务IP        /// </summary>        public string ProxyIp        {            get { return proxyip; }            set { proxyip = value; }        }    }}</span>