namespace  XXXX.Utilites{    using System;    using System.Collections.Generic;    using System.IO;    using System.IO.Compression;    using System.Net;    using System.Net.Security;    using System.Security.Cryptography.X509Certificates;    using System.Text;    public class PostHttpResponse    {        #region Static Field        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)";        #endregion        #region public Method        public static string PostHttpResponseJson(string url)        {            string json = string.Empty;            Encoding encoding = Encoding.UTF8;            HttpWebResponse Response = CreatePostHttpResponseJson(url,null,null, null, null, encoding, null);            json = GetStream(Response, encoding);            return json;        }        public static string PostHttpResponseJson(string url, string  postJson)        {            string json = string.Empty;            Encoding encoding = Encoding.UTF8;            HttpWebResponse Response = CreatePostHttpResponseJson(url, postJson, null, null, null, encoding, null);            json = GetStream(Response, encoding);            return json;        }           /// <summary>        /// 创建POST方式Json数据的HTTP请求（包括了https站点请求）         /// </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 CreatePostHttpResponseJson(string url, string postJson,string parameters, int? timeout, string userAgent, Encoding requestEncoding, string referer)        {            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";            //服务端 判断 客户端 提交的是否是 JSON数据 时            request.ContentType = "application/json;charset=UTF-8";            request.KeepAlive = true;            if (!string.IsNullOrEmpty(userAgent))            {                request.UserAgent = userAgent;            }            else            {                request.UserAgent = DefaultUserAgent;            }            if (timeout.HasValue)            {                request.Timeout = timeout.Value;            }            //如果需要POST数据              #region post parameter  类似querystring格式            if (parameters != null)            {                byte[] data =http://www.mamicode.com/ requestEncoding.GetBytes(parameters);                using (Stream stream = request.GetRequestStream())                {                    stream.Write(data, 0, data.Length);                    stream.Close();                }            }            #endregion            #region post json            if (!string.IsNullOrEmpty(postJson))            {                using (var streamWriter = new StreamWriter(request.GetRequestStream()))                {                    //string json = "{\"user\":\"test\"," +                    //              "\"password\":\"bla\"}";                    streamWriter.Write(postJson);                    streamWriter.Flush();                    streamWriter.Close();                }            }            #endregion            if (!string.IsNullOrEmpty(referer))            {                request.Referer = referer;            }            HttpWebResponse response = request.GetResponse() as HttpWebResponse;            if (request.CookieContainer != null)            {                response.Cookies = request.CookieContainer.GetCookies(request.RequestUri);            }            return response;        }        #endregion        #region Private Method        private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)        {            return true; //总是接受          }        /// <summary>        /// 将response转换成文本        /// </summary>        /// <param name="response"></param>        /// <param name="encoding"></param>        /// <returns></returns>        private static string GetStream(HttpWebResponse response, Encoding encoding)        {            try            {                if (response.StatusCode == HttpStatusCode.OK)                {                    switch (response.ContentEncoding.ToLower())                    {                        case "gzip":                            {                                string result = Decompress(response.GetResponseStream(), encoding);                                response.Close();                                return result;                            }                        default:                            {                                using (StreamReader sr = new StreamReader(response.GetResponseStream(), encoding))                                {                                    string result = sr.ReadToEnd();                                    sr.Close();                                    sr.Dispose();                                    response.Close();                                    return result;                                }                            }                    }                }                else                {                    response.Close();                }            }            catch (Exception e)            {                throw e;            }            return "";        }        private static string Decompress(Stream stream, Encoding encoding)        {            byte[] buffer = new byte[100];            //int length = 0;            using (GZipStream gz = new GZipStream(stream, CompressionMode.Decompress))            {                //GZipStream gzip = new GZipStream(res.GetResponseStream(), CompressionMode.Decompress);                using (StreamReader reader = new StreamReader(gz, encoding))                {                    return reader.ReadToEnd();                }                /*                using (MemoryStream msTemp = new MemoryStream())                {                    //解压时直接使用Read方法读取内容，不能调用GZipStream实例的Length等属性，否则会出错：System.NotSupportedException: 不支持此操作；                    while ((length = gz.Read(buffer, 0, buffer.Length)) != 0)                    {                        msTemp.Write(buffer, 0, length);                    }                    return encoding.GetString(msTemp.ToArray());                }                 * */            }        }        #endregion    }}