有关HTTP请求的辅助类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Security;
using System.IO;
using System.Security.Cryptography.X509Certificates;
namespace 数据提交
{
class HttpHelper
{
// public static CookieContainer cookies = new CookieContainer();
public static string ErrorMesage = "";
/// <summary>
/// 有关HTTP请求的辅助类
/// </summary>
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)";
private static readonly string FireFoxAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.23) Gecko/20110920 Firefox/3.6.23";
private static readonly string IE7 = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C; .NET4.0E)";
private static readonly string IE = "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.97 Safari/537.11";
/// <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, string userAgent, string referer, ref CookieContainer cookies)
{
try
{
if (string.IsNullOrEmpty(url))
{
throw new ArgumentNullException("url");
}
System.Net.HttpWebRequest request = WebRequest.Create(url) as System.Net.HttpWebRequest;
if (!string.IsNullOrEmpty(userAgent))
{
request.UserAgent = userAgent;
}
else
{
request.UserAgent = DefaultUserAgent;
}
if (!string.IsNullOrEmpty(referer))
{
request.Referer = referer;
}
//设置或获取Cookie
if (cookies.Count == 0)
{
request.CookieContainer = new CookieContainer();
cookies = request.CookieContainer;
}
else
{
request.CookieContainer = cookies;
}
request.Method = "GET";
request.Headers.Set("Cache-Control", "no-cache");
//request.Headers.Set("Accept-Encoding", "gzip,deflate");
request.Headers.Set("Accept-Language", "zh-cn");
request.Headers.Set("Accept-Charset", "gb2312,utf-8");
request.Accept = "*/*";
request.ContentType = "application/x-www-form-urlencoded";
request.AllowAutoRedirect = true;
request.Timeout = 5000;
//request.Headers.Set("X-Requested-With", "XMLHttpRequest");
//request.Headers.Set("Origin", "https://dynamic.12306.cn");
//request.Referer = referer;
//request.Expect = null;
//request.KeepAlive = true;
return request.GetResponse() as HttpWebResponse;
}
catch (Exception ex)
{
ErrorMesage = ex.Message;
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>
public static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters, string userAgent, Encoding requestEncoding, string referer, ref CookieContainer cookies)
{
try
{
if (string.IsNullOrEmpty(url))
{
throw new ArgumentNullException(url);
}
if (requestEncoding == null)
{
throw new ArgumentNullException("requestEncoding");
}
System.Net.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 System.Net.HttpWebRequest;
request.ProtocolVersion = HttpVersion.Version10;
}
else
{
request = WebRequest.Create(url) as System.Net.HttpWebRequest;
}
if (!string.IsNullOrEmpty(userAgent))
{
request.UserAgent = userAgent;
}
else
{
request.UserAgent = DefaultUserAgent;
}
if (!string.IsNullOrEmpty(referer))
{
request.Referer = referer;
}
request.Method = "POST";
request.Headers.Set("Cache-Control", "no-cache");
//request.Headers.Set("Accept-Encoding", "gzip,deflate,sdch");
request.Headers.Set("Accept-Language", "zh-cn");
request.Headers.Set("Accept-Charset", "gb2312,utf-8");
request.Accept = "*/*";
request.ContentType = "application/x-www-form-urlencoded";
request.AllowAutoRedirect = true;
request.Timeout = 5000;
//设置或获取Cookie
if (cookies.Count == 0)
{
request.CookieContainer = new CookieContainer();
cookies = request.CookieContainer;
}
else
{
request.CookieContainer = cookies;
}
//request.Headers.Set("X-Requested-With", "XMLHttpRequest");
//request.Headers.Set("Origin", "https://dynamic.12306.cn");
//request.Referer = referer;
//request.Expect = null;
//request.KeepAlive = true;
//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 System.Net.HttpWebResponse;
}
catch (Exception ex)
{
ErrorMesage = ex.Message;
return null;
}
}
private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
return true; //总是接受
}
}
}