C# HttpHelper 1.0正式版發布

下載地址：http://www.sufeinet.com/thread-3-1-1.html

歡迎大家使用，寫了這么久終於可以發布一個版本了。大家快下載試試吧。

功能說明：

1.實現常規的POST和GET請求。

2.實現了可設置編碼與無視編碼功能，可以自動解析編碼。

3.實現了Cookie攜帶功能。

4.實現了代理請求功能

5.更多的例子請大家到我博客查看

原文地址： http://www.sufeinet.com/thread-403-1-1.html

發一部分代碼給大家看吧

/// <summary>
/// 類說明：HttpHelps類，用來實現Http訪問，Post或者Get方式的，直接訪問，帶Cookie的，帶證書的等方式，可以設置代理
/// 編碼日期：2011-09-20
/// 編 碼 人：蘇飛
/// 聯系方式：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 預定義方法或者變更

        //默認的編碼
        public Encoding encoding = Encoding.Default;
        //HttpWebRequest對象用來發起請求
        public HttpWebRequest request = null;
        //獲取影響流的數據對象
        private HttpWebResponse response = null;
        //返回的Cookie
        public string cookie = "";
        //是否設置為全文小寫
        public Boolean isToLower = true;
        //讀取流的對象
        private StreamReader reader = null;
        //需要返回的數據對象
        private string returnData = "String Error";

        /// <summary>
        /// 根據相傳入的數據，得到相應頁面數據
        /// </summary>
        /// <param name="strPostdata">傳入的數據Post方式,get方式傳NUll或者空字符串都可以</param>
        /// <returns>string類型的響應數據</returns>
        private string GetHttpRequestData(string strPostdata)
        {
            try
            {
                //支持跳轉頁面，查詢結果將是跳轉后的頁面
                request.AllowAutoRedirect = true;

                //驗證在得到結果時是否有傳入數據
                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);
                }

                ////最大連接數
                //request.ServicePoint.ConnectionLimit = 1024;

                #region 得到請求的response

                using (response = (HttpWebResponse)request.GetResponse())
                {
                    try
                    {
                        cookie = response.Headers["set-cookie"].ToString();
                    }
                    catch (Exception)
                    {

                    }
                    //從這里開始我們要無視編碼了
                    if (encoding == null)
                    {
                        MemoryStream _stream = new MemoryStream();
                        if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
                        {
                            //開始讀取流並設置編碼方式
                            //new GZipStream(response.GetResponseStream(), CompressionMode.Decompress).CopyTo(_stream, 10240);

                            //.net4.0以下寫法
                            _stream = GetMemoryStream(response.GetResponseStream());
                        }
                        else
                        {
                            //response.GetResponseStream().CopyTo(_stream, 10240);
                            // .net4.0以下寫法
                            _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))
                        {
                            //開始讀取流並設置編碼方式
                            using (reader = new StreamReader(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress), encoding))
                            {
                                returnData = reader.ReadToEnd();
                            }
                        }
                        else
                        {
                            //開始讀取流並設置編碼方式
                            using (reader = new StreamReader(response.GetResponseStream(), encoding))
                            {
                                returnData = reader.ReadToEnd();
                            }
                        }
                    }
                }

                #endregion
            }
            catch (WebException ex)
            {
                //這里是在發生異常時返回的錯誤信息
                returnData = "String Error";
                response = (HttpWebResponse)ex.Response;
            }
            if (isToLower)
            {
                returnData = returnData.ToLower();
            }
            return returnData;
        }

        /// <summary>
        /// 4.0以下.net版本取水運
        /// </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>
        /// 為請求准備參數
        /// </summary>
        ///<param name="objhttpItem">參數列表</param>
        /// <param name="_Encoding">讀取數據時的編碼方式</param>
        private void SetRequest(HttpItem objhttpItem)
        {
            //初始化對像，並設置請求的URL地址
            request = (HttpWebRequest)WebRequest.Create(GetUrl(objhttpItem.URL));
            //請求方式Get或者Post
            request.Method = objhttpItem.Method;
            //Accept
            request.Accept = objhttpItem.Accept;
            //ContentType返回類型
            request.ContentType = objhttpItem.ContentType;
            //UserAgent客戶端的訪問類型，包括瀏覽器版本和操作系統信息
            request.UserAgent = objhttpItem.UserAgent;
            if (objhttpItem.Encoding == "NULL")
            {
                //讀取數據時的編碼方式
                encoding = null;
            }
            else
            {
                //讀取數據時的編碼方式
                encoding = System.Text.Encoding.GetEncoding(objhttpItem.Encoding);
            }
            //Cookie
            request.Headers[HttpRequestHeader.Cookie] = objhttpItem.Cookie;
            //來源地址
            request.Referer = objhttpItem.Referer;
        }

        /// <summary>
        /// 設置當前訪問使用的代理
        /// </summary>
        /// <param name="userName">代理 服務器用戶名</param>
        /// <param name="passWord">代理 服務器密碼</param>
        /// <param name="ip">代理 服務器地址</param>
        public void SetWebProxy(string userName, string passWord, string ip)
        {
            //設置代理服務器
            WebProxy myProxy = new WebProxy(ip, false);
            //建議連接
            myProxy.Credentials = new NetworkCredential(userName, passWord);
            //給當前請求對象
            request.Proxy = myProxy;
            //設置安全憑證
            request.Credentials = CredentialCache.DefaultNetworkCredentials;
        }

        #endregion

        #region 普通類型

        /// <summary>    
        /// 傳入一個正確或不正確的URl，返回正確的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協議訪問網絡,根據傳入的URl地址，得到響應的數據字符串。
        ///</summary>
        ///<param name="objhttpItem">參數列表</param>
        ///<returns>String類型的數據</returns>
        public string GetHtml(HttpItem objhttpItem)
        {
            //准備參數
            SetRequest(objhttpItem);

            //調用專門讀取數據的類
            return GetHttpRequestData(objhttpItem.Postdata);
        }
        #endregion
    }

    /// <summary>
    /// Http請求參考類 
    /// </summary>
    public class HttpItem
    {
        string _URL;
        /// <summary>
        /// 請求URL必須填寫
        /// </summary>
        public string URL
        {
            get { return _URL; }
            set { _URL = value; }
        }

        string _Method = "GET";
        /// <summary>
        /// 請求方式默認為GET方式
        /// </summary>
        public string Method
        {
            get { return _Method; }
            set { _Method = value; }
        }

        string _Accept = "text/html, application/xhtml+xml, */*";
        /// <summary>
        /// 請求標頭值 默認為text/html, application/xhtml+xml, */*
        /// </summary>
        public string Accept
        {
            get { return _Accept; }
            set { _Accept = value; }
        }

        string _ContentType = "text/html";
        /// <summary>
        /// 請求返回類型默認 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>
        /// 客戶端訪問信息默認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>
        /// 返回數據編碼默認為NUll,可以自動識別
        /// </summary>
        public string Encoding
        {
            get { return _Encoding; }
            set { _Encoding = value; }
        }

        string _Postdata;
        /// <summary>
        /// Post請求時要發送的Post數據
        /// </summary>
        public string Postdata
        {
            get { return _Postdata; }
            set { _Postdata = value; }
        }

        string _Cookie;
        /// <summary>
        /// 請求時的Cookie
        /// </summary>
        public string Cookie
        {
            get { return _Cookie; }
            set { _Cookie = value; }
        }

        string _Referer;
        /// <summary>
        /// 來源地址，上次訪問地址
        /// </summary>
        public string Referer
        {
            get { return _Referer; }
            set { _Referer = value; }
        }
    }
}