C#模拟http 发送post或get请求

C#模拟HTTP请求

最新推荐文章于 2025-08-07 13:18:55 发布

Hustudent20080101

最新推荐文章于 2025-08-07 13:18:55 发布

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本文介绍如何使用C#模拟发送HTTP POST和GET请求，并通过实例演示登录过程。涉及Cookie处理及重定向控制。

C#模拟http 发送post或get请求

           private 
           string 
           HttpPost(
           string 
           Url, 
           string 
           postDataStr)
          
           {
          
           HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
          
           request.Method = 
           "POST"
           ;
          
           request.ContentType = 
           "application/x-www-form-urlencoded"
           ;
          
           request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);
          
           request.CookieContainer = cookie;
          
           Stream myRequestStream = request.GetRequestStream();
          
           StreamWriter myStreamWriter = 
           new 
           StreamWriter(myRequestStream, Encoding.GetEncoding(
           "gb2312"
           ));
          
           myStreamWriter.Write(postDataStr);
          
           myStreamWriter.Close();
          
           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;
          
           }
          
           public 
           string 
           HttpGet(
           string 
           Url, 
           string 
           postDataStr)
          
           {
          
           HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == 
           "" 
           ?  
           "" 
           : 
           "?"
           ) + postDataStr);
          
           request.Method = 
           "GET"
           ;
          
           request.ContentType = 
           "text/html;charset=UTF-8"
           ;
          
           HttpWebResponse response = (HttpWebResponse)request.GetResponse();
          
           Stream myResponseStream = response.GetResponseStream();
          
           StreamReader myStreamReader = 
           new 
           StreamReader(myResponseStream, Encoding.GetEncoding(
           "utf-8"
           ));
          
           string 
           retString = myStreamReader.ReadToEnd();
          
           myStreamReader.Close();
          
           myResponseStream.Close();
          
           return 
           retString;
          
           }

在post的时候有时也用的到cookie，像登录163发邮件时候就需要发送cookie，所以在外部一个cookie属性随时保存 CookieContainer cookie = new CookieContainer();

！注意：有时候请求会重定向，但我们就需要从重定向url获取东西，像QQ登录成功后获取sid，但上面的会自动根据重定向地址跳转。我们可以用:
request.AllowAutoRedirect = false;设置重定向禁用，你就可以从headers的Location属性中获取重定向地址

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C#模拟POST登录cnblogs并发布文章

用到的工具FireFox的Firebugs插件打开网络功能进行抓包数据如下

可以得知POST的数据为：

__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=%2FwEPDwULLTE1MzYzODg2NzZkGAEFHl9fQ29udHJvbHNSZXF1aXJlUG9zdEJhY2tLZXlfXxYBBQtjaGtSZW1lbWJlcm1QYDyKKI9af4b67Mzq2xFaL9Bt&__EVENTVALIDATION=%2FwEWBQLWwpqPDQLyj%2FOQAgK3jsrkBALR55GJDgKC3IeGDE1m7t2mGlasoP1Hd9hLaFoI2G05&tbUserName=账户&tbPassword=密码&btnLogin=%E7%99%BB++%E5%BD%95&txtReturnUrl=http%3A%2F%2Fhome.cnblogs.com%2F

在VS里画登陆图

　查看别人的代码登录代码：

string postData =string.Format( "__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=/wEPDwULLTE1MzYzODg2NzZkGAEFHl9fQ29udHJvbHNSZXF1aXJlUG9zdEJhY2tLZXlfXxYBBQtjaGtSZW1lbWJlcm1QYDyKKI9af4b67Mzq2xFaL9Bt&__EVENTVALIDATION=/wEWBQLWwpqPDQLyj/OQAgK3jsrkBALR55GJDgKC3IeGDE1m7t2mGlasoP1Hd9hLaFoI2G05&tbUserName={0}&tbPassword={1}&btnLogin=登录&txtReturnUrl=http://home.cnblogs.com/",txtName.Text.Trim(),txtPwd.Text.Trim());
//这是cnblogs提交时的一些参数
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] data = encoding.GetBytes(postData);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://passport.cnblogs.com/login.aspx");
request.Method = "Post";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
request.KeepAlive = true;
request.CookieContainer = container; //返回的cookie会附加在这个容器里面
//发送数据

Stream newStream = request.GetRequestStream();
newStream.Write(data, 0, data.Length);

HttpWebResponse response = (HttpWebResponse)request.GetResponse();
newStream = response.GetResponseStream();
StreamReader reader = new StreamReader(newStream, Encoding.UTF8);
string text = reader.ReadToEnd();
reader.Close();
newStream.Close();