C#模拟Http与Https请求框架实例

  1 using System.Text;
  2 using System.Net;
  3 using System.IO;
  4 using System.Text.RegularExpressions;
  5 using System.Security.Cryptography.X509Certificates;
  6 using System.Net.Security;
  7 namespace WebRequestTest
  8 {
  9     /// <summary>
 10     /// 动态类，每个实例使用单独session
 11     /// </summary>
 12     public class HttpHelperNew
 13     {
 14        public CookieContainer cookie = new CookieContainer(); 
 15         /// <summary>
 16         /// post请求返回html
 17         /// </summary>
 18         /// <param name="Url"></param>
 19         /// <param name="postDataStr"></param>
 20         /// <returns></returns>
 21         public string HttpPost(string Url, string postDataStr)
 22         {
 23             HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
 24             //request.AllowAutoRedirect = false; //禁止自动重定向
 25             request.Method = "POST";
 26             request.ContentType = "application/x-www-form-urlencoded";
 27             request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);
 28             request.CookieContainer = cookie; //cookie信息由CookieContainer自行维护
 29             Stream myRequestStream = request.GetRequestStream();
 30             StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));
 31             myStreamWriter.Write(postDataStr);
 32             myStreamWriter.Close();
 33             HttpWebResponse response = null;
 34             try
 35             {
 36                 this.SetCertificatePolicy();
 37                 response = (HttpWebResponse)request.GetResponse();
 38             }
 39             catch (System.Exception ex)
 40             {
 41             }
 42             //获取重定向地址
 43             //string url1 = response.Headers["Location"];
 44             if (response !=null)
 45             {
 46                 Stream myResponseStream = response.GetResponseStream();
 47                 StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
 48                 string retString = myStreamReader.ReadToEnd();
 49                 myStreamReader.Close();
 50                 myResponseStream.Close();
 51                 return retString;
 52             }
 53             else
 54             {
 55                 return "error"; //post请求返回为空
 56             }
 57         }
 58         /// <summary>
 59         /// get请求获取返回的html
 60         /// </summary>
 61         /// <param name="Url"></param>
 62         /// <param name="postDataStr"></param>
 63         /// <returns></returns>
 64         public string HttpGet(string Url, string Querydata)
 65         {
 66             HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (Querydata == "" ? "" : "?") + Querydata);
 67             request.Method = "GET";
 68             request.ContentType = "text/html;charset=UTF-8";
 69             request.CookieContainer = cookie;
 70             this.SetCertificatePolicy();
 71             HttpWebResponse response = (HttpWebResponse)request.GetResponse();
 72            // response.Cookies = cookie.GetCookies(response.ResponseUri);
 73             Stream myResponseStream = response.GetResponseStream();
 74             StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
 75             string retString = myStreamReader.ReadToEnd();
 76             myStreamReader.Close();
 77             myResponseStream.Close();
 78             return retString;
 79         }
 80         /// <summary>
 81         /// 获得响应中的图像
 82         /// </summary>
 83         /// <param name="url"></param>
 84         /// <returns></returns>
 85         public Stream GetResponseImage(string url)
 86         {
 87             Stream resst = null;
 88             try
 89             {
 90                 HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
 91                 req.KeepAlive = true;
 92                 req.Method = "GET";
 93                 req.AllowAutoRedirect = true;
 94                 req.CookieContainer = cookie;
 95                 req.ContentType = "application/x-www-form-urlencoded";
 96                 req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
 97                 req.Timeout = 50000;
 98                 Encoding myEncoding = Encoding.GetEncoding("UTF-8");
 99                 this.SetCertificatePolicy();
100                 HttpWebResponse res = (HttpWebResponse)req.GetResponse();
101                 resst = res.GetResponseStream();
102                 return resst;
103             }
104             catch
105             {
106                 return null;
107             }
108         }
109         /// <summary>
110         /// 正则获取匹配的第一个值
111         /// </summary>
112         /// <param name="html"></param>
113         /// <param name="pattern"></param>
114         /// <returns></returns>
115         public string getStringByRegex(string html,string pattern)
116         {
117             Regex re = new Regex(pattern, RegexOptions.IgnoreCase);
118             MatchCollection matchs = re.Matches(html);
119             if (matchs.Count > 0)
120             {
121                 return matchs[0].Groups[1].Value;
122             }
123             else
124                 return "";
125         }
126         /// <summary>
127         /// 正则验证返回的response是否正确
128         /// </summary>
129         /// <param name="html"></param>
130         /// <param name="pattern"></param>
131         /// <returns></returns>
132         public bool verifyResponseHtml(string html ,string pattern)
133         {
134             Regex re = new Regex(pattern);
135             return re.IsMatch(html);
136         }
137         //注册证书验证回调事件，在请求之前注册
138         private void SetCertificatePolicy()
139         {
140             ServicePointManager.ServerCertificateValidationCallback
141                        += RemoteCertificateValidate;
142         }
143         /// <summary>  
144         /// 远程证书验证，固定返回true 
145         /// </summary>  
146         private static bool RemoteCertificateValidate(object sender, X509Certificate cert,
147             X509Chain chain, SslPolicyErrors error)
148         {
149             return true;
150         }  
151     }
152 }