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C# HttpWebRequest 绝技

2011-05-22 16:29  苏飞  阅读(83661)  评论(42编辑  收藏  举报

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如果要使用中间的方法的话,可以访问我的帮助类完全免费开源:C# HttpHelper,帮助类,真正的Httprequest请求时无视编码,无视证书,无视Cookie,网页抓取

1.第一招,根据URL地址获取网页信息

   先来看一下代码

get方法

 public static string GetUrltoHtml(string Url,string type)
        {
            
try
            {
                System.Net.WebRequest wReq 
= System.Net.WebRequest.Create(Url);
                
// Get the response instance.
                System.Net.WebResponse wResp = wReq.GetResponse();
                System.IO.Stream respStream 
= wResp.GetResponseStream();
                
// Dim reader As StreamReader = New StreamReader(respStream)
                using (System.IO.StreamReader reader = new System.IO.StreamReader(respStream, Encoding.GetEncoding(type)))
                {
                    return reader.ReadToEnd();
                }

            }
            
catch (System.Exception ex)
            {
                
//errorMsg = ex.Message;
            }
            
return "";
        }

post方法

  ///<summary>
        
///采用https协议访问网络
        
///</summary>
        
///<param name="URL">url地址</param>
        
///<param name="strPostdata">发送的数据</param>
        
///<returns></returns>
        public string OpenReadWithHttps(string URL, string strPostdata, string strEncoding)
        {
            Encoding encoding 
= Encoding.Default;
            HttpWebRequest request 
= (HttpWebRequest)WebRequest.Create(URL);
            request.Method 
= "post";
            request.Accept 
= "text/html, application/xhtml+xml, */*";
            request.ContentType 
= "application/x-www-form-urlencoded";
            
byte[] buffer = encoding.GetBytes(strPostdata);
            request.ContentLength 
= buffer.Length;
            request.GetRequestStream().Write(buffer, 
0, buffer.Length);
            HttpWebResponse response 
= (HttpWebResponse)request.GetResponse();
            using( StreamReader reader 
= new StreamReader(response.GetResponseStream(), System.Text.Encoding.GetEncoding(strEncoding)))
              {
                   
return reader.ReadToEnd();
              }
        }

 

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