C# HttpHelper,Httprequest,请求时无视编码，无视证书，无视Cookie,网页抓取
以下不做无视证书的方法 无论是Get还是Post 带Cookie，编码问题解决 ，这里完全做到了无视编码的问题
最近把上面的方法整理了一下,这个类相当于一个SqlHelper类一下，我把它叫做HttpHelper类，以后还会慢慢更新，希望大家多我支持，
给大家分享一下吧，不好的地方感谢大家留言指正，不多说了上代码吧！
/// <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：2011-08-20 /// 编 码 人： 苏飞 /// 联系方式：361983679 Email：[email protected] Blogs:http://sufei.cnblogs.com /// 修改日期：2011-12-30 /// </summary> using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.IO; using System.Text.RegularExpressions; using System.IO.Compression; public class HttpHelps { #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; 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()) { //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="_URL">请求的URL地址</param> /// <param name="_Method">请求方式Get或者Post</param> /// <param name="_Accept">Accept</param> /// <param name="_ContentType">ContentType返回类型</param> /// <param name="_UserAgent">UserAgent客户端的访问类型，包括浏览器版本和操作系统信息</param> /// <param name="_Encoding">读取数据时的编码方式</param> private void SetRequest(string _URL, string _Method, string _Accept, string _ContentType, string _UserAgent, Encoding _Encoding) { //初始化对像，并设置请求的URL地址 request = (HttpWebRequest)WebRequest.Create(GetUrl(_URL)); //请求方式Get或者Post request.Method = _Method; //Accept request.Accept = _Accept; //ContentType返回类型 request.ContentType = _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 = _UserAgent; //读取数据时的编码方式 encoding = _Encoding; } /// <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GET|POST方式访问网络,根据传入的URl地址，得到响应的数据字符串。 /// </summary> /// <param name="_URL"></param> /// <param name="_Method">请求方式Get或者Post</param> /// <param name="_Accept">Accept</param> /// <param name="_ContentType">ContentType返回类型</param> /// <param name="_UserAgent">UserAgent客户端的访问类型，包括浏览器版本和操作系统信息</param> /// <param name="_Encoding">读取数据时的编码方式</param> /// <param name="_Postdata">只有_Method为Post方式时才需要传入值</param> /// <returns>返回Html源代码</returns> public string GetHttpRequestString(string _URL, string _Method, string _Accept, string _ContentType, string _UserAgent, Encoding _Encoding, string _Postdata) { //准备参数 SetRequest(_URL, _Method, _Accept, _ContentType, _UserAgent, _Encoding); //调用专门读取数据的类 return GetHttpRequestData(_Postdata); } ///<summary> ///采用https协议GET方式访问网络,根据传入的URl地址，得到响应的数据字符串。 ///</summary> ///<param name="URL">url地址</param> ///<param name="objencoding">编码方式例如：System.Text.Encoding.UTF8;</param> ///<returns>String类型的数据</returns> public string GetHttpRequestStringByNUll_Get(string URL, Encoding objencoding) { //准备参数 SetRequest(URL, "GET", "text/html, application/xhtml+xml, */*", "text/html", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)", objencoding); //调用专门读取数据的类 return GetHttpRequestData(""); } ///<summary> ///采用https协议GET方式访问网络,根据传入的URl地址，得到响应的数据字符串。 ///</summary> ///<param name="URL">url地址</param> ///<param name="objencoding">编码方式例如：System.Text.Encoding.UTF8;</param> ///<param name="stgrcookie">Cookie字符串</param> ///<returns>String类型的数据</returns> public string GetHttpRequestStringByNUll_GetBycookie(string URL, Encoding objencoding, string stgrcookie) { //准备参数 SetRequest(URL, "GET", "text/html, application/xhtml+xml, */*", "text/html", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)", objencoding); request.Headers[HttpRequestHeader.Cookie] = stgrcookie; //调用专门读取数据的类 return GetHttpRequestData(""); } ///<summary> ///采用https协议GET方式访问网络,根据传入的URl地址，得到响应的数据字符串。 ///</summary> ///<param name="URL">url地址</param> ///<param name="objencoding">编码方式例如：System.Text.Encoding.UTF8;</param> ///<returns>String类型的数据</returns> public string GetHttpRequestStringByNUll_Get(string URL, Encoding objencoding, string _Accept, string useragent) { //准备参数 SetRequest(URL, "GET", _Accept, "text/html", useragent, objencoding); //调用专门读取数据的类 return GetHttpRequestData(""); } ///<summary> ///采用https协议Post方式访问网络,根据传入的URl地址，得到响应的数据字符串。 ///</summary> ///<param name="URL">url地址</param> ///<param name="strPostdata">Post发送的数据</param> ///<param name="objencoding">编码方式例如：System.Text.Encoding.UTF8;</param> ///<returns>String类型的数据</returns> public string GetHttpRequestStringByNUll_Post(string URL, string strPostdata, Encoding objencoding) { //准备参数 SetRequest(URL, "post", "text/html, application/xhtml+xml, */*,zh-CN", "text/html", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)", objencoding); //调用专门读取数据的类 return GetHttpRequestData(strPostdata); } #endregion }
具体使用
public string GetHtml(string url, string type)
{
HttpHelps objhh = new HttpHelps();
return objhh.GetHttpRequestStringByNUll_Get(url, System.Text.Encoding.GetEncoding(type.Trim()));
}
带有代理 的使用方法
public string GetHtml(string url, string type)
{
HttpHelps objhh = new HttpHelps();
objhh.SetWebProxy("服务器用户名", "密码", "ip:端口");
return objhh.GetHttpRequestStringByNUll_Get(url, System.Text.Encoding.GetEncoding(type.Trim()));
}
在很多情况下我们会使用间进程的webBrowser去实现一些网页的请求和抓去，这个时候有部分网页是取不到Cookie的，那怎么办呢？下面我提供一个方法，应该99%的都能取到，
//取当前webBrowser登录后的Cookie值 [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)] static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref int pcchCookieData, int dwFlags, object lpReserved); //取出Cookie，当登录后才能取 private static string GetCookieString(string url) { // Determine the size of the cookie int datasize = 256; StringBuilder cookieData = new StringBuilder(datasize); if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, null)) { if (datasize < 0) return null; // Allocate stringbuilder large enough to hold the cookie cookieData = new StringBuilder(datasize); if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, null)) return null; } return cookieData.ToString(); }
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