HttpHelpers类普通GET和POST方式，带Cookie和带证书验证模式

/// <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：2011-09-13

 

/// </summary>using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Text;

using System.Net;

using System.IO;

using System.Security.Cryptography.X509Certificates;

using System.Net.Security;

using System;

/// <summary>

///HttpHelpers 主要是实现Http方式的Get和Post方式请求

/// </summary>

public class HttpHelpers

{

    /// <summary>

    /// 构造器实现默认属性的赋值

    /// </summary>

    public HttpHelpers()

    {

        //设置请求方式为Post

        request.Method = "GET";

        request.Accept = "text/html, application/xhtml+xml, */*";

        request.ContentType = "application/x-www-form-urlencoded";

    }

    #region 所有的属性

    //访问的页面地址

    private string RequestURl { get; set; }

    //默认的编码

    private Encoding encoding { get; set; }

    //HttpWebRequest对象用来发起请求

    private HttpWebRequest request { get; set; }

    //获取影响流的数据对象

    private HttpWebResponse response { get; set; }

    //证书文件X509Certificate objx509 = new X509Certificate(Application.StartupPath + "\\123.cer");

    X509Certificate objx509 { get; set; }

    //请求方式目前只提供Post和Get方式

    private string Method { get; set; }

    //Accept属性

    private string Accept { get; set; }

    //ContentType属性

    private string ContentType { get; set; }

    //UserAgent属性

    private string UserAgent { get; set; }

    //Cookie列表

    private CookieContainer cookie { get; set; }

    //需要返回的数据对象

    private string reutrnDate { get; set; }

    //Post数据串

    private string strPostdata { get; set; }

    #endregion

    #region 内部方法

    //回调验证证书问题

    private bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)

    {

        // 总是接受    

        return true;

    }

    /// <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()

    {

        try

        {

            //是否要添加证书验证

            if (objx509 != null)

            {

                //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);

            }

            //创建request对象

            request = (HttpWebRequest)WebRequest.Create(RequestURl);

            //是否要添加证书验证

            if (objx509 != null)

                request.ClientCertificates.Add(objx509);

            //是否带有Cookie值

            if (cookie != null)

                request.CookieContainer = cookie;

            //当为post提交是需要填充数据

            if (Method.Trim().ToLower() == "post")

            {

                byte[] buffer = encoding.GetBytes(strPostdata);

                request.ContentLength = buffer.Length;

                request.GetRequestStream().Write(buffer, 0, buffer.Length);

            }

            //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)

                    GetEonding();

                //开始读取流并设置编码方式

                using (StreamReader reader = new StreamReader(response.GetResponseStream(), encoding))

                {

                    //从当前开始读取整个流数据，默认为0所以读取的是全部，并返回数据

                    reutrnDate = reader.ReadToEnd().ToString().Trim();

                }

            }

        }

        catch (Exception)

        {

            //这里是在发生异常时返回的错误信息

            reutrnDate = "String Error";

        }

        return reutrnDate;

    }

    /// <summary>

    /// 得到response对象的编码类型

    /// </summary>

    private void GetEonding()

    {

        if (response.CharacterSet.Trim() != "")

            encoding = System.Text.Encoding.GetEncoding(response.CharacterSet.Trim());

        else

            encoding = System.Text.Encoding.UTF8;

    }

    #endregion

    #region 公开方法

    /// <summary>

    /// 只设置一些简单参数的方式

    /// </summary>

    /// <param name="_url">URl地址</param>

    /// <param name="_strPostdata">Post请求方式时传入的数据</param>

    /// <param name="_Method">请求方式GET或者POST可以为空默认为GET</param>

    /// <param name="_encoding">编码方式可以为空默认为UTF-8</param>

    /// <param name="_Accept">Accept属性</param>

    /// <param name="_ContentType">ContentType属性</param

    /// <param name="_UserAgent">UserAgent属性</param

    /// <param name="_cookie">CookieContainer列表</param

    /// <param name="_objx509">X509Certificate证书对象</param

    /// <returns>请求所得到的数据</returns>

    public string GetString_null(string _url, string _strPostdata, string _Method, Encoding _encoding, string _Accept,

        string _ContentType, string _UserAgent, CookieContainer _cookie, X509Certificate _objx509)

    {

        RequestURl = _url;

        Method = _Method;

        encoding = _encoding;

        Accept = _Accept;

        ContentType = _ContentType;

        UserAgent = _UserAgent;

        cookie = _cookie;

        objx509 = _objx509;

        return GetHttpRequestData();

    }

    /// <summary>

    /// 只设置一些简单参数的方式

    /// </summary>

    /// <param name="_url">URl地址</param>

    /// <param name="_strPostdata">Post请求方式时传入的数据</param>

    /// <param name="_Method">请求方式GET或者POST可以为空默认为GET</param>

    /// <param name="_encoding">编码方式可以为空默认为UTF-8</param>

    /// <returns>请求所得到的数据</returns>

    public string GetString_type(string _url, string _Method, Encoding _encoding)

    {

        RequestURl = _url;

        Method = _Method;

        encoding = _encoding;

        return GetHttpRequestData();

    }

    //下面大家自己可以多写几种常用的，呵呵

    #endregion

}