本文实例讲述了C#模拟Http与Https请求框架类。分享给大家供大家参考。

具体实现方法如下：

复制代码 代码如下:
using System.Text;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;
using System.Security.Cryptography.X509Certificates;
using System.Net.Security;

namespace WebRequestTest
{
/// <summary>
/// 动态类，每个实例使用单独session
/// </summary>
public class HttpHelperNew
{
public CookieContainer cookie = new CookieContainer();
/// <summary>
/// post请求返回html
/// </summary>
/// <param name="Url"></param>
/// <param name="postDataStr"></param>
/// <returns></returns>
public string HttpPost(string Url, string postDataStr)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
//request.AllowAutoRedirect = false; //禁止自动重定向
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);
request.CookieContainer = cookie; //cookie信息由CookieContainer自行维护
Stream myRequestStream = request.GetRequestStream();
StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));
myStreamWriter.Write(postDataStr);
myStreamWriter.Close();

HttpWebResponse response = null;
try
{
this.SetCertificatePolicy();
response = (HttpWebResponse)request.GetResponse();
}
catch (System.Exception ex)
{
}
//获取重定向地址
//string url1 = response.Headers["Location"];
if (response !=null)
{
Stream myResponseStream = response.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
string retString = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return retString;
}
else
{
return "error"; //post请求返回为空
}
}

/// <summary>
/// get请求获取返回的html
/// </summary>
/// <param name="Url"></param>
/// <param name="postDataStr"></param>
/// <returns></returns>
public string HttpGet(string Url, string Querydata)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (Querydata == "" ? "" : "?") + Querydata);
request.Method = "GET";
request.ContentType = "text/html;charset=UTF-8";
request.CookieContainer = cookie;
this.SetCertificatePolicy();
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
// response.Cookies = cookie.GetCookies(response.ResponseUri);
Stream myResponseStream = response.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
string retString = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return retString;
}

/// <summary>
/// 获得响应中的图像
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public Stream GetResponseImage(string url)
{
Stream resst = null;
try
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.KeepAlive = true;
req.Method = "GET";
req.AllowAutoRedirect = true;
req.CookieContainer = cookie;
req.ContentType = "application/x-www-form-urlencoded";
req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
req.Timeout = 50000;

Encoding myEncoding = Encoding.GetEncoding("UTF-8");
this.SetCertificatePolicy();
HttpWebResponse res = (HttpWebResponse)req.GetResponse();
resst = res.GetResponseStream();

return resst;
}
catch
{
return null;
}
}

/// <summary>
/// 正则获取匹配的第一个值
/// </summary>
/// <param name="html"></param>
/// <param name="pattern"></param>
/// <returns></returns>
public string getStringByRegex(string html,string pattern)
{

Regex re = new Regex(pattern, RegexOptions.IgnoreCase);
MatchCollection matchs = re.Matches(html);
if (matchs.Count > 0)
{
return matchs[0].Groups[1].Value;
}
else
return "";
}

/// <summary>
/// 正则验证返回的response是否正确
/// </summary>
/// <param name="html"></param>
/// <param name="pattern"></param>
/// <returns></returns>
public bool verifyResponseHtml(string html ,string pattern)
{
Regex re = new Regex(pattern);
return re.IsMatch(html);
}

//注册证书验证回调事件，在请求之前注册
private void SetCertificatePolicy()
{
ServicePointManager.ServerCertificateValidationCallback
+= RemoteCertificateValidate;
}
/// <summary>
/// 远程证书验证，固定返回true
/// </summary>
private static bool RemoteCertificateValidate(object sender, X509Certificate cert,
X509Chain chain, SslPolicyErrors error)
{
return true;
}
}
}

希望本文所述对大家的C#程序设计有所帮助。