深入学习C#网络编程之HTTP应用编程（上）

清晰的认识我想类库里面的属性和方法都是神马和浮云。

五 ：案例

      既然是上篇，就根据“模拟登录”的思想做一个简单的“暴力破解”的小程序，非常简单，呵呵。

第一步： 首先我们写两个action，一个login（登录页面），一个index（用户后台首页）。

 namespace Test.Controllers
 {
  [HandleError]
  public class HomeController : Controller
  {
   public ActionResult Login()
   {
    return View();
   }
 
   [HttpPost]
   public ActionResult Index(Model model)
   {
    if (model.UserName == "11" && model.Password == "11")
     return View(model);
    else
     return RedirectToAction("Login");
   }
 
   public ActionResult About()
   {
    return View();
   }
  }
 
  public class Model
  {
   public string UserName { get; set; }
 
   public string Password { get; set; }
  }
 }

好了，我们打开fiddler，输入admin，admin，点击提交，看看都post些什么到server端了，方便我们后面的模拟登录，

这里的head信息相信大家还是能看懂吧。

第二步：我们新建一个winform的程序。

namespace Http
 {
  public partial class Form1 : Form
  {
   public Form1()
   {
    InitializeComponent();
   }
 
   private void Form1_Load(object sender, EventArgs e)
   {
    //网页内容填充webbrowser1控件
    string url = "http://localhost:59773/";
 
    //创建http链接
    var request = (HttpWebRequest)WebRequest.Create(url);
 
    var response = (HttpWebResponse)request.GetResponse();
 
    Stream stream = response.GetResponseStream();
 
    StreamReader sr = new StreamReader(stream);
 
    string content = sr.ReadToEnd();
 
    webBrowser1.DocumentText = content;
   }
 
   /// <summary>
 /// 暴力破解
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
   private void button1_Click(object sender, EventArgs e)
   {
    var url = "http://localhost:59773/Home/Index";
 
    //上一次的返回结果
    string prev = string.Empty;
 
    for (int i = 0; i < 100; i++)
    {
     var username = new Random(DateTime.Now.Millisecond).Next(8, 19).ToString();
 
     Thread.Sleep(2);
 
     var password = new Random(DateTime.Now.Millisecond).Next(8, 19).ToString();
 
     //post提交的内容
     var content = "username=" + username + "&password=" + password;
 
     //将content变为字节形式
     var bytes = Encoding.UTF8.GetBytes(content);
 
     var request = (HttpWebRequest)WebRequest.Create(url);
 
     //根据fiddler中查看到的提交信息，我们也试着模拟追加此类信息然后提交
     request.Method = WebRequestMethods.Http.Post;
     request.Timeout = 1000 * 60;
     request.AllowAutoRedirect = true;
     request.ContentLength = bytes.Length;
     request.ContentType = "application/x-www-form-urlencoded";
 
 
     //将content写入post请求中
     var stream = request.GetRequestStream();
     stream.Write(bytes, 0, bytes.Length);
     stream.Close();
 
     //写入成功，获取请求流
     var response = (HttpWebResponse)request.GetResponse();
 
     var sr = new StreamReader(response.GetResponseStream());
 
     var next = sr.ReadToEnd();
 
     if (string.IsNullOrEmpty(prev))
     {
      prev = next;
     }
     else
     {
      if (prev != next)
      {
       webBrowser2.DocumentText = next;
       MessageBox.Show("恭喜你，密码已经破解！一共花费：" + (i + 1) + "次，用户名为：" + username + ",密码为：" + password);
       return;
      }
     }
 
    }
    webBrowser2.DocumentText = "不好意思，未能破解";
   }
  }
 }								 
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