【原理】

【代码】

1 private void button2_Click(object sender, EventArgs e) 2         { 3             string url =“请求的地址”  4             indata = “传入的数据&传入的数据”; 5             string outdata = ""; 6             byte[] data = System.Text.Encoding.UTF8.GetBytes(indata); 7  8             //新建一个HttpWebRequest  9             HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);10 11             //一定要设置ContentType12             myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";13             myHttpWebRequest.ContentLength = data.Length;14             myHttpWebRequest.Method = "POST";15 16             //新建一个CookieContainer来存放Cookie集合 17             CookieContainer myCookieContainer = new CookieContainer();18 19             //设置HttpWebRequest的CookieContainer为刚才建立的那个myCookieContainer 20             myHttpWebRequest.CookieContainer = myCookieContainer;21 22             //把数据写入HttpWebRequest的Request流 23             Stream myRequestStream = myHttpWebRequest.GetRequestStream();24             myRequestStream.Write(data, 0, data.Length);25             StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("utf-8"));26 27             //关闭打开对象 28             myRequestStream.Flush();29             myRequestStream.Close();30 31             //新建一个HttpWebResponse 32             HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();33 34             //把数据从HttpWebResponse的Response流中读出 35             Stream myResponseStream = myHttpWebResponse.GetResponseStream();36             StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));37             outdata = myStreamReader.ReadToEnd();38 39             //关闭打开的对象 40             myStreamReader.Close();41             myResponseStream.Close();42 43             //显示"登录" 44             //拿到了Cookie，再进行请求就能直接读取到登录后的内容了 45             myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);46 47             //刚才那个CookieContainer已经存有了Cookie,把它附加到HttpWebRequest中则能直接通过验证 48             myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();49 50             //读取登陆后的内容51             myResponseStream = myHttpWebResponse.GetResponseStream();52             myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));53             outdata = myStreamReader.ReadToEnd();54 55             //关闭打开的对象 56             myStreamReader.Close();57             myResponseStream.Close();58 59             Console.WriteLine(outdata);60             this.webBrowser1.DocumentText = outdata;61         }

 

【备注】

当Cookie被设置为HttpOnly时，此方法就无法获取Cookie了，关于HttpOnly的限制，下一篇文章将继续研究。