使用C#发送Http 请求实现模拟登陆（以博客园为例）

模拟登陆的原理很简单，就是发送一个Http 请求服务器获得响应，然后客户端获取到cookie即可实现模拟登陆，比如一些抢票软件的原理无非也是这样模拟客户端的cookie 然后发送请求去抢票。本文将演示如何用C# 来实现模拟登陆的，推荐一款工具Fiddler，这是一款监听http 请求的利器。废话不多说，我就以博客园为例来实现模拟登陆。首先我登陆博客园 http://passport.cnblogs.com/login.aspx 输入用户名和密码点登陆就会看到Fiddler 上的相关信息：

Ok，我首先需要发送一个http 请求，这个请求时POST的方式，然后用户名和密码就是POST的数据。代码如下：

 1 static CookieContainer GetCookie(string postString, string postUrl)
 2 {
 3 
 4 CookieContainer cookie = new CookieContainer();
 5 
 6 HttpWebRequest httpRequset = (HttpWebRequest)HttpWebRequest.Create(postUrl);//创建http 请求
 7 httpRequset.CookieContainer = cookie;//设置cookie
 8 httpRequset.Method = "POST";//POST 提交
 9 httpRequset.KeepAlive = true;
10 httpRequset.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko";
11 httpRequset.Accept = "text/html, application/xhtml+xml, */*";
12 httpRequset.ContentType = "application/x-www-form-urlencoded";//以上信息在监听请求的时候都有的直接复制过来
13 byte[] bytes = System.Text.Encoding.UTF8.GetBytes(postString);
14 httpRequset.ContentLength = bytes.Length;
15 Stream stream = httpRequset.GetRequestStream();
16 stream.Write(bytes, 0, bytes.Length);
17 stream.Close();//以上是POST数据的写入
18 
19 HttpWebResponse httpResponse = (HttpWebResponse)httpRequset.GetResponse();//获得 服务端响应
20 return cookie;//拿到cookie
21 }

拿到cookie 之后我们就可以以用户的什么去用户的后台或者其他的地方:

 1 static string GetContent(CookieContainer cookie, string url)
 2 {
 3 string content;
 4 HttpWebRequest httpRequest = (HttpWebRequest)HttpWebRequest.Create(url);
 5 httpRequest.CookieContainer = cookie;
 6 httpRequest.Referer = url;
 7 httpRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko";
 8 httpRequest.Accept = "text/html, application/xhtml+xml, */*";
 9 httpRequest.ContentType = "application/x-www-form-urlencoded";
10 httpRequest.Method = "GET";
11 
12 HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse();
13 
14 using (Stream responsestream = httpResponse.GetResponseStream())
15 {
16 
17 using (StreamReader sr = new StreamReader(responsestream, System.Text.Encoding.UTF8))
18 {
19 content = sr.ReadToEnd();
20 }
21 }
22 
23 return content;
24 }

OK 下面是调用我写的是一个控制台程序：

 1  1 static void Main(string[] args)
 2  2 {
 3  3 string loginstr = "{要post 的登陆数据包括用户名和密码}";
 4  4 
 5  5 //从登陆的地址获取cookie
 6  6 CookieContainer cookie = GetCookie(loginstr, "http://passport.cnblogs.com/login.aspx");
 7  7 
 8  8 //这个是进入后台地址
 9  9 Console.WriteLine(GetContent(cookie, "http://i.cnblogs.com/EditPosts.aspx"));
10 10 
11 11 Console.Read();
12 12 }