C#HttpHelper类---苏飞版
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C#HttpHelper实现了C#HttpWebRequest抓取时无视编码，无视证书，无视Cookie，并且实现的代理的功能，使用它您可以进行Get和Post请求，可以很方便 的设置Cookie，证书，代理，编码问题您不用管，因为类会自动为您识别网页的编码。
这个类是我以前写百度，和网络蜘蛛时使用的，经过上千万个网站的测试，上万个网站抓取的例子总结出来的，中间的方法也是我实验了很久之后方案，所以大家可以放心使用。
来源：http://www.sufeinet.com/thread-3-1-1.html
这个类是我以前写百度，和网络蜘蛛时使用的，经过上千万个网站的测试，上万个网站抓取的例子总结出来的，中间的方法也是我实验了很久之后方案，所以大家可以放心使用。
我不敢说100%，但是应该是99%的网站都没有问题，都可以无视编码，证书，和Cookie，如果你确实发现那个网站在使用本类过程中有问题，出现乱码，或者是获取不了，不能带Cookie，不能带证书等问题
/// <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.sufeinet.com/thread-3-1-1.html/// 修改日期：2013-02-07/// </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 /// </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; /// <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 HttpResult GetHttpRequestData(HttpItem objhttpitem) { //返回参数 HttpResult result = new HttpResult(); try { #region 得到请求的response using (response = (HttpWebResponse)request.GetResponse()) { result.Header = response.Headers; if (response.Cookies != null) { result.CookieCollection = response.Cookies; } if (response.Headers["set-cookie"] != null) { result.Cookie = response.Headers["set-cookie"]; } MemoryStream _stream = new MemoryStream(); //GZIIP处理 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(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress)); } else { //开始读取流并设置编码方式 //response.GetResponseStream().CopyTo(_stream, 10240); //.net4.0以下写法 _stream = GetMemoryStream(response.GetResponseStream()); } //获取Byte byte[] RawResponse = _stream.ToArray(); //是否返回Byte类型数据 if (objhttpitem.ResultType == ResultType.Byte) { result.ResultByte = RawResponse; } //从这里开始我们要无视编码了 if (encoding == null) { 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); } } } } //得到返回的HTML result.Html = encoding.GetString(RawResponse); //最后释放流 _stream.Close(); } #endregion } catch (WebException ex) { //这里是在发生异常时返回的错误信息 result.Html = "String Error"; response = (HttpWebResponse)ex.Response; } if (objhttpitem.IsToLower) { result.Html = result.Html.ToLower(); } return result; } /// <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) { // 验证证书 SetCer(objhttpItem); //设置Header参数 if (objhttpItem.Header != null) { request.Headers = objhttpItem.Header; } // 设置代理 SetProxy(objhttpItem); //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; // 编码 SetEncoding(objhttpItem); //设置Cookie SetCookie(objhttpItem); //来源地址 request.Referer = objhttpItem.Referer; //是否执行跳转功能 request.AllowAutoRedirect = objhttpItem.Allowautoredirect; //设置Post数据 SetPostData(objhttpItem); //设置最大连接 if (objhttpItem.Connectionlimit > 0) { request.ServicePoint.ConnectionLimit = objhttpItem.Connectionlimit; } } /// <summary> /// 设置证书 /// </summary> /// <param name="objhttpItem"></param> private void SetCer(HttpItem objhttpItem) { 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)); } } /// <summary> /// 设置编码 /// </summary> /// <param name="objhttpItem">Http参数</param> private void SetEncoding(HttpItem objhttpItem) { 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); } } /// <summary> /// 设置Cookie /// </summary> /// <param name="objhttpItem">Http参数</param> private void SetCookie(HttpItem objhttpItem) { if (!string.IsNullOrEmpty(objhttpItem.Cookie)) { //Cookie request.Headers[HttpRequestHeader.Cookie] = objhttpItem.Cookie; } //设置Cookie if (objhttpItem.CookieCollection != null) { request.CookieContainer = new CookieContainer(); request.CookieContainer.Add(objhttpItem.CookieCollection); } } /// <summary> /// 设置Post数据 /// </summary> /// <param name="objhttpItem">Http参数</param> private void SetPostData(HttpItem objhttpItem) { //验证在得到结果时是否有传入数据 if (request.Method.Trim().ToLower().Contains("post")) { //写入Byte类型 if (objhttpItem.PostDataType == PostDataType.Byte) { //验证在得到结果时是否有传入数据 if (objhttpItem.PostdataByte != null && objhttpItem.PostdataByte.Length > 0) { request.ContentLength = objhttpItem.PostdataByte.Length; request.GetRequestStream().Write(objhttpItem.PostdataByte, 0, objhttpItem.PostdataByte.Length); } }//写入文件 else if (objhttpItem.PostDataType == PostDataType.FilePath) { StreamReader r = new StreamReader(objhttpItem.Postdata, encoding); byte[] buffer = Encoding.Default.GetBytes(r.ReadToEnd()); r.Close(); request.ContentLength = buffer.Length; request.GetRequestStream().Write(buffer, 0, buffer.Length); } else { //验证在得到结果时是否有传入数据 if (!string.IsNullOrEmpty(objhttpItem.Postdata)) { byte[] buffer = Encoding.Default.GetBytes(objhttpItem.Postdata); request.ContentLength = buffer.Length; request.GetRequestStream().Write(buffer, 0, buffer.Length); } } } } /// <summary> /// 设置代理 /// </summary> /// <param name="objhttpItem">参数对象</param> private void SetProxy(HttpItem objhttpItem) { 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; } } /// <summary> /// 回调验证证书问题 /// </summary> /// <param name="sender">流对象</param> /// <param name="certificate">证书</param> /// <param name="chain">X509Chain</param> /// <param name="errors">SslPolicyErrors</param> /// <returns>bool</returns> 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 HttpResult 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; } } private PostDataType _PostDataType = PostDataType.String; /// <summary> /// Post的数据类型 /// </summary> public PostDataType PostDataType { get { return _PostDataType; } set { _PostDataType = value; } } string _Postdata; /// <summary> /// Post请求时要发送的字符串Post数据 /// </summary> public string Postdata { get { return _Postdata; } set { _Postdata = value; } } private byte[] _PostdataByte = null; /// <summary> /// Post请求时要发送的Byte类型的Post数据 /// </summary> public byte[] PostdataByte { get { return _PostdataByte; } set { _PostdataByte = value; } } CookieCollection cookiecollection = null; /// <summary> /// Cookie对象集合 /// </summary> public CookieCollection CookieCollection { get { return cookiecollection; } set { cookiecollection = 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; } } 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 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; } } private ResultType resulttype = ResultType.String; /// <summary> /// 设置返回类型String和Byte /// </summary> public ResultType ResultType { get { return resulttype; } set { resulttype = value; } } private WebHeaderCollection header = new WebHeaderCollection(); //header对象 public WebHeaderCollection Header { get { return header; } set { header = value; } } } /// <summary> /// Http返回参数类 /// </summary> public class HttpResult { string _Cookie = string.Empty; /// <summary> /// Http请求返回的Cookie /// </summary> public string Cookie { get { return _Cookie; } set { _Cookie = value; } } CookieCollection cookiecollection = null; /// <summary> /// Cookie对象集合 /// </summary> public CookieCollection CookieCollection { get { return cookiecollection; } set { cookiecollection = value; } } private string html = string.Empty; /// <summary> /// 返回的String类型数据 只有ResultType.String时才返回数据，其它情况为空 /// </summary> public string Html { get { return html; } set { html = value; } } private byte[] resultbyte = null; /// <summary> /// 返回的Byte数组 只有ResultType.Byte时才返回数据，其它情况为空 /// </summary> public byte[] ResultByte { get { return resultbyte; } set { resultbyte = value; } } private WebHeaderCollection header = new WebHeaderCollection(); //header对象 public WebHeaderCollection Header { get { return header; } set { header = value; } } } /// <summary> /// 返回类型 /// </summary> public enum ResultType { String,//表示只返回字符串 Byte//表示返回字符串和字节流 } /// <summary> /// Post的数据格式默认为string /// </summary> public enum PostDataType { String,//字符串 Byte,//字符串和字节流 FilePath//表示传入的是文件 }}来源：http://www.sufeinet.com/thread-3-1-1.html
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