C#模拟Http与Https请求框架类实例

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：

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。