C#模拟http 发送post请求模拟登录

最新推荐文章于 2025-07-01 15:02:27 发布

Hustudent20080101

最新推荐文章于 2025-07-01 15:02:27 发布

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本文详细介绍了使用C#实现CNBlog网站登录的过程。通过构造特定的POST数据并设置请求头来模拟用户登录行为，文中还展示了如何处理登录所需的视图状态和验证令牌。此外，还提供了完整的代码示例，包括如何发送POST请求、处理响应流以及读取返回的数据。

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();

/////////////////////////////////////////////////////////////
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;
}