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。