• 转:C# HttpHelper,Httprequest,请求时无视编码,无视证书,无视Cookie,网页抓取


     文章来自:   http://sufei.cnblogs.com/  

     

    最新的HttpHeper类下载

    https://files.cnblogs.com/sufei/HttpHelps.zip (更新时间2011-12-07)

    下载更新可能没有下面的类快,如果要使用最新版的就直接复制下面代码,下载我会抽空更新

     之前我写过篇关于C# HttpWebRequest 绝技的文章 无视证书的方法请在篇文章里面查找谢谢,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
    /// 编码日期:2011-08-20
    /// 编 码 人: 苏飞
    /// 联系方式:361983679 Email:sufei.1013@163.com Blogs:http://sufei.cnblogs.com
    /// </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;
    }

    #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()));
    }





    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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  • 原文地址:https://www.cnblogs.com/skyapplezhao/p/2304693.html
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