CentrifugalTime/HttpService/HttpWebResponseUtility.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;

namespace DefaultEdit.HttpService
{
    /// <summary>  
    /// 有关HTTP请求的辅助类  
    /// </summary>  
    public class HttpWebResponseUtility
    {
        private static readonly string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
        /// <summary>  
        /// 创建GET方式的HTTP请求  
        /// </summary>  
        /// <param name="url">请求的URL</param>  
        /// <param name="timeout">请求的超时时间</param>  
        /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>  
        /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>  
        /// <returns></returns>  
        public static HttpWebResponse CreateGetHttpResponse(string url, int? timeout, string userAgent, CookieCollection cookies)
        {
            if ( string.IsNullOrEmpty(url) )
            {
                throw new ArgumentNullException("url");
            }
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Method = "GET";
            request.UserAgent = DefaultUserAgent;
            if ( !string.IsNullOrEmpty(userAgent) )
            {
                request.UserAgent = userAgent;
            }
            if ( timeout.HasValue )
            {
                request.Timeout = timeout.Value;
            }
            if ( cookies != null )
            {
                request.CookieContainer = new CookieContainer();
                request.CookieContainer.Add(cookies);
            }
            return request.GetResponse() as HttpWebResponse;
        }
        /// <summary>  
        /// 创建POST方式的HTTP请求  
        /// </summary>  
        /// <param name="url">请求的URL</param>  
        /// <param name="parameters">随同请求POST的参数名称及参数值字典</param>  
        /// <param name="timeout">请求的超时时间</param>  
        /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>  
        /// <param name="requestEncoding">发送HTTP请求时所用的编码</param>  
        /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>  
        /// <returns></returns>  
        public static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters, int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies)
        {
            if ( string.IsNullOrEmpty(url) )
            {
                throw new ArgumentNullException("url");
            }
            if ( requestEncoding == null )
            {
                throw new ArgumentNullException("requestEncoding");
            }
            HttpWebRequest request=null;
            //如果是发送HTTPS请求  
            if ( url.StartsWith("https", StringComparison.OrdinalIgnoreCase) )
            {
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                request = WebRequest.Create(url) as HttpWebRequest;
                request.ProtocolVersion = HttpVersion.Version10;
            }
            else
            {
                request = WebRequest.Create(url) as HttpWebRequest;
            }
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";

            if ( !string.IsNullOrEmpty(userAgent) )
            {
                request.UserAgent = userAgent;
            }
            else
            {
                request.UserAgent = DefaultUserAgent;
            }

            if ( timeout.HasValue )
            {
                request.Timeout = timeout.Value;
            }
            if ( cookies != null )
            {
                request.CookieContainer = new CookieContainer();
                request.CookieContainer.Add(cookies);
            }
            //如果需要POST数据  
            if ( !( parameters == null || parameters.Count == 0 ) )
            {
                StringBuilder buffer = new StringBuilder();
                int i = 0;
                foreach ( string key in parameters.Keys )
                {
                    if ( i > 0 )
                    {
                        buffer.AppendFormat("&{0}={1}", key, parameters[ key ]);
                    }
                    else
                    {
                        buffer.AppendFormat("{0}={1}", key, parameters[ key ]);
                    }
                    i++;
                }
                byte[] data = requestEncoding.GetBytes(buffer.ToString());
                using ( Stream stream = request.GetRequestStream() )
                {
                    stream.Write(data, 0, data.Length);
                }
            }
            return request.GetResponse() as HttpWebResponse;
        }

        private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            return true; //总是接受  
        }




    }
}