HTTP请求

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Web;
using System.Text;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Reflection;
using System.Text.RegularExpressions;

namespace WXCustomerCard.Code {
    public class HttpQuery {
        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)";

        public static void Get(string url, object data, Action<string> callback) {
            IDictionary<string, string> parameters = Getparameters(data);

            if (!(parameters == null || parameters.Count == 0)) {
                url += "?";
                foreach (var item in parameters) {
                    url += item.Key + "=" + item.Value + "&";
                }
            }
            CreateGetHttpResponse(url, null, null, null, callback);
        }

        public static void Post(string url, object data, Action<string> callback) {
            IDictionary<string, string> parameters = Getparameters(data);

            CreatePostHttpResponse(url, parameters, null, null, Encoding.UTF8, null, callback);
        }
        public static void Post(string url, IDictionary<string, string> data, Action<string> callback) {
            CreatePostHttpResponse(url, data, null, null, Encoding.UTF8, null, callback);
        }

        public static void Post(string url, string data, Action<string> callback) {
            CreatePostHttpResponse(url, data, null, null, Encoding.UTF8, null, callback);
        }

        private static IDictionary<string, string> Getparameters(object data) {
            if (data == null) {
                return new Dictionary<string, string>();
            }
            IDictionary<string, string> parameters = new Dictionary<string, string>();

            Type type = data.GetType();
            PropertyInfo[] props = type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
            foreach (PropertyInfo p in props) {
                parameters.Add(p.Name, p.GetValue(data).ToString());
            }

            return parameters;
        }

        /// <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>  
        private static HttpWebResponse CreateGetHttpResponse(string url, int? timeout, string userAgent,
            CookieCollection cookies, Action<string> callback, string encoding = "utf-8") {
            if (string.IsNullOrEmpty(url)) {
                return null;
                //throw new ArgumentNullException("url");
            }
            try {
                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);
                }

                HttpWebResponse httpWebResponse = request.GetResponse() as HttpWebResponse;

                StreamReader reader = new StreamReader(httpWebResponse.GetResponseStream(),
                    System.Text.Encoding.GetEncoding(encoding));

                string html = "";
                //获取请求到的数据
                html = reader.ReadToEnd();
                //关闭
                httpWebResponse.Close();
                reader.Close();

                Regex regex = new Regex("charset=(?<code>\w+)"");
                Match match = regex.Match(html);
                string code = match.Groups["code"].Value;
                if (!string.IsNullOrWhiteSpace(code) && code.ToLower() != encoding.ToLower()) {
                    return CreateGetHttpResponse(url, timeout, userAgent, cookies, callback, code);
                } else {
                    callback(html);
                    return httpWebResponse;
                }
            } catch {
                callback(null);
            }
            return null;
        }

        /// <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>  
        private static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters,
            int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies, Action<string> callback) {
            if (string.IsNullOrEmpty(url)) {
                throw new ArgumentNullException("url");
            }
            if (requestEncoding == null) {
                throw new ArgumentNullException("requestEncoding");
            }
            HttpWebRequest request = null;
            try {
                //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);
                    }
                }

                HttpWebResponse httpWebResponse = request.GetResponse() as HttpWebResponse;

                StreamReader reader = new StreamReader(httpWebResponse.GetResponseStream(),
                    System.Text.Encoding.GetEncoding("utf-8"));

                string html = "";
                //获取请求到的数据
                html = reader.ReadToEnd();

                //关闭
                httpWebResponse.Close();
                reader.Close();

                callback(html);

                return httpWebResponse;
            } catch {
                callback(null);
            }
            return null;
        }

        private static HttpWebResponse CreatePostHttpResponse(string url, string parameters, int? timeout,
            string userAgent, Encoding requestEncoding, CookieCollection cookies, Action<string> callback) {
            if (string.IsNullOrEmpty(url)) {
                return null;
                //throw new ArgumentNullException("url");
            }
            if (requestEncoding == null) {
                throw new ArgumentNullException("requestEncoding");
            }
            HttpWebRequest request = null;
            try {
                //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 (!string.IsNullOrEmpty(parameters)) {
                    using (var streamWriter = new StreamWriter(request.GetRequestStream())) {
                        streamWriter.Write(parameters);
                        streamWriter.Flush();
                    }
                }

                HttpWebResponse httpWebResponse = request.GetResponse() as HttpWebResponse;

                StreamReader reader = new StreamReader(httpWebResponse.GetResponseStream(),
                    System.Text.Encoding.GetEncoding("utf-8"));

                string html = "";
                //获取请求到的数据
                html = reader.ReadToEnd();

                //关闭
                httpWebResponse.Close();
                reader.Close();

                callback(html);

                return httpWebResponse;
            } catch {
                callback(null);
            }
            return null;
        }

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

        public JsonResult Orders( ) {
            string json = "";
            string url = string.Format("www.baidu.com”);
            HttpQuery.Get(url, null, msg => {
                json = msg;
            });
            if (json != "") {
                return Json(json);
            }
            return Json("");
        }