技术应用——网页自动登录（提交Post内容）的用途很多，如验证身份、程序升级、网络投票等，以下是用C#实现的方法.

页自动登录和提交POST信息的核心就是分析网页的源代码（HTML），在C#中，可以用来提取网页HTML的组件比较多，常用的用WebBrowser、WebClient、HttpWebRequest这三个。

以下就分别用这三种方法来实现：
1、WebBrowser是个"迷你"浏览器，其特点是Post时不用关心Cookie、内置JS等问题
WebBrowser是VS提供的组件（其实就是封装了IE接口），实现POST功能一般在webBrowser的DocumentCompleted中分析HtmlDocument 来实现，代码如下：

1. HtmlElement ClickBtn =null;
2. if (e.Url.ToString().ToLower().IndexOf("http://oceanchen.cnblogs.com/") > 0) //登陆页面
3. {
4. HtmlDocument doc = webBrowser1.Document;
5. for (int i = 0; i < doc.All.Count ; i++)
6. {
7. if (doc.All[i].TagName.ToUpper().Equals("INPUT"))
8. {
9. switch (doc.All[i].Name)
10. {
11. case "userCtl":
12. doc.All[i].InnerText = "user01";
13. break;
14. case "passCt1":
15. doc.All[i].InnerText = "mypass";
16. break;
17. case "B1":
18. ClickBtn = doc.All[i]; //提交按钮
19. break;
20. }
21. }
22. }
23. ClickBtn.InvokeMember("Click"); //执行按扭操作
24. }

2、WebClient封装了HTTP的一些类，操作简单，相较于webBrowser，特点是可以自设代理，缺点是对COOKIE的控制
WebClient的运行全在后台，并且提供了异步操作的能力，这样很方便并发多个任务，然后等待结果的返回，再逐个处理。多任务异步调用的代码如下：

1. private void StartLoop(int ProxyNum)
2. {
3. WebClient [] wcArray = new WebClient[ProxyNum]; //初始化
4. for (int idArray = 0; idArray< ProxyNum;idArray++)
5. {
6. wcArray[idArray] = new WebClient();
7. wcArray[idArray].OpenReadCompleted += new OpenReadCompletedEventHandler(Pic_OpenReadCompleted2);
8. wcArray[idArray].UploadDataCompleted += new UploadDataCompletedEventHandler(Pic_UploadDataCompleted2);
9. try
10. {
11.  
12. wcArray[idArray].Proxy = new WebProxy(proxy[1], port);
13. wcArray[idArray].OpenReadAsync(new Uri("http://oceanchen.cnblogs.com/")); //打开WEB;
14. proxy = null;
15. }
16. catch
17. {
18. }
19. }
20. }
21.  
22. private void Pic_OpenReadCompleted2(object sender, OpenReadCompletedEventArgs e)
23. {
24. if (e.Error == null)
25. {
26. string textData = new StreamReader(e.Result, Encoding.Default).ReadToEnd(); //取返回信息
27. ..
28. String cookie = ((WebClient)sender).ResponseHeaders["Set-Cookie"];
29. ((WebClient)sender).Headers.Add("Content-Type", "application/x-www-form-urlencoded");
30. ((WebClient)sender).Headers.Add("Accept-Language", "zh-cn");
31. ((WebClient)sender).Headers.Add("Cookie", cookie);
32.  
33. string postData = ""
34. byte[] byteArray = Encoding.UTF8.GetBytes(postData); // 转化成二进制数组
35. ((WebClient)sender).UploadDataAsync(new Uri("http://oceanchen.cnblogs.com/"), "POST", byteArray);
36. }
37. }
38.  
39. private void Pic_UploadDataCompleted2(object sender, UploadDataCompletedEventArgs e)
40. {
41. if (e.Error == null)
42. {
43. string returnMessage = Encoding.Default.GetString(e.Result);
44.  
45. }
46. }

3、HttpWebRequest较为低层，能实现的功能较多，Cookie操作也很简单:

1. private bool PostWebRequest()
2. {
3. CookieContainer cc = new CookieContainer();
4. string pos tData = "user=" + strUser + "&pass=" + strPsd;
5. byte[] byteArray = Encoding.UTF8.GetBytes(postData); // 转化
6.  
7. HttpWebRequest webRequest2 = (HttpWebRequest)WebRequest.Create(new Uri(http://oceanchen.cnblogs.com/));
8. webRequest2.CookieContainer = cc;
9. webRequest2.Method = "POST";
10. webRequest2.ContentType = "application/x-www-form-urlencoded";
11. webRequest2.ContentLength = byteArray.Length;
12. Stream newStream = webRequest2.GetRequestStream();
13. // Send the data.
14. newStream.Write(byteArray, 0, byteArray.Length); //写入参数
15. newStream.Close();
16.  
17. HttpWebResponse response2 = (HttpWebResponse)webRequest2.GetResponse();
18. StreamReader sr2=new StreamReader(response2.GetResponseStream(), Encoding.Default);
19. string text2 = sr2.ReadToEnd();
20.  
21. }

HttpWebRequest 实现， 这个是从网上COPY 的！我以前用相关的代码登录到WWW.ASP.NET上，并且成功post，可惜代码不知道放什么地方了。

 

HttpWebRequest自动登录网站并获取网站内容（不包含验证码的网站）

可以使用 Visual Sniffer（百度搜索） 来捕捉提交的数据信息：

1. 访问你需要站外提交的页面，比如 CSDN 登陆页 http://www.csdn.net/member/UserLogin.aspx

2. 填写好需要的资料，比如用户名和密码，

3. 打开 Visual Sniffer, 点“开始拦截”

4. 在访问的页面中提交。

5. 等提交成功之后，在 Visual Sniffer 中“停止拦截”

6. 在 Visual Sniffer 的左侧栏的加号中依次点开，右边是它拦截到的内容：

1. POST http://www.csdn.net/member/UserLogin.aspx HTTP/1.0
2. Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*
3. Referer: http://www.csdn.net/member/UserLogin.aspx
4. Accept-Language: zh-cn
5. Content-Type: application/x-www-form-urlencoded
6. UA-CPU: x86
7. Pragma: no-cache
8. User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; InfoPath.1)
9. Host: www.csdn.net
10. Content-Length: 355
11. Proxy-Connection: Keep-Alive
12. Cookie: ASPSESSIONIDAAAATBQC=FMEGGCKDBKHAMMCGKPFDMBFG; ASP.NET_SessionId=lusprmnom05lr445tmteaf55; userid=699879
13.  
14. __EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=dDwtMTcwMzgxNjQ2Mjs7bDxDU0ROVXNlckxvZ2luOmNiX1NhdmVTdGF0ZTtDU0ROVXNlckxvZ2luOkltYWdlX0xvZ2luOz4%2Btu1q2wmRZoAJTi9L73w1zBleylY%3D&CSDNUserLogin%3Atb_UserName=testusername&CSDNUserLogin%3Atb_Password=testpassword&CSDNUserLogin%3Atb_ExPwd=9232&from=&CSDNUserLogin%3AImage_Login.x=36&CSDNUserLogin%3AImage_Login.y=6
15. GET http://www.csdn.net/mycustompage.htm?aspxerrorpath=/member/UserLogin.aspx HTTP/1.0
16. Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*
17. Referer: http://www.csdn.net/member/UserLogin.aspx
18. Accept-Language: zh-cn
19. UA-CPU: x86
20. Pragma: no-cache
21. User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; InfoPath.1)
22. Host: www.csdn.net
23. Proxy-Connection: Keep-Alive
24. Cookie: ASPSESSIONIDAAAATBQC=FMEGGCKDBKHAMMCGKPFDMBFG; ASP.NET_SessionId=lusprmnom05lr445tmteaf55; userid=699879

 

以上为拦截内容，其中提交数据的参数部分（程序中的：strArgs）如：
__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=dDwtMTcwMzgxNjQ2Mjs7bDxDU
0ROVXNlckxvZ2luOmNiX1NhdmVTdGF0ZTtDU0ROVXNlckxvZ2luOkltYWdlX0xvZ2luOz4%2Btu
1q2wmRZoAJTi9L73w1zBleylY%3D&CSDNUserLogin%3Atb_UserName=testusername&CSDN
UserLogin%3Atb_Password=testpassword&CSDNUserLogin%3Atb_ExPwd=9232      

1. protected static string cookieHeader;
2. private void Page_Load(object sender, System.EventArgs e)
3. {
4. string strReContent = string.Empty;
5. //登录
6. strReContent = PostLogin("http://www.mystand.com.cn/login/submit.jsp提交的页面","提交的参数：userid=hgj0000&password=06045369","引用地址：http://www.mystand.com.cn/");
7. //asp.net登录传递的参数需注意
8. //strReContent = PostLogin("http://www.mystand.com.cn/login.aspx","__VIEWSTATE=dDwtNjkzMjUyNDczO3Q8O2w8aTwzPjs%2BO2w8dDxwPHA8bDxUZXh0Oz47bDxcZTs%2BPjs%2BOzs%2BOz4%2BOz6aX2dtqkJTK%2BKbNPsjd7Op%2Fl26Iw%3D%3D&txtUserName=hxf&txtPassword=hxf0000&btnEnter=%E7%99%BB%E5%BD%95","http://www.mystand.com.cn/login.aspx");
9. //获取页面
10. strReContent = GetPage("http://www.mystand.com.cn/company/getdata.jsp?code=","引用地址：http://www.mystand.com.cn/");
11. //strReContent = GetPage("http://www.mystand.com.cn/Modules/index.aspx","http://www.mystand.com.cn/login.aspx");
12. //可以对获得的内容进行处理：strReContent
13. }
14.  
15. /**//// <summary>
16. /// 功能描述：模拟登录页面，提交登录数据进行登录，并记录Header中的cookie
17. /// </summary>
18. /// <param name="strURL">登录数据提交的页面地址</param>
19. /// <param name="strArgs">用户登录数据</param>
20. /// <param name="strReferer">引用地址</param>
21. /// <returns>可以返回页面内容或不返回</returns>
22. public static string PostLogin(string strURL,string strArgs,string strReferer)
23. {
24. string strResult = "";
25. HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(strURL);
26. myHttpWebRequest.AllowAutoRedirect = true;
27. myHttpWebRequest.KeepAlive = true;
28. myHttpWebRequest.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/msword, application/x-shockwave-flash, */*";
29. myHttpWebRequest.Referer = strReferer;
30.  
31. myHttpWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 2.0.50727)";
32. myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";
33. myHttpWebRequest.Method = "POST";
34.  
35. CookieCollection myCookies = null;
36. CookieContainer myCookieContainer = new CookieContainer();
37. myHttpWebRequest.CookieContainer = myCookieContainer;
38.  
39. Stream MyRequestStrearm = myHttpWebRequest.GetRequestStream();
40. StreamWriter MyStreamWriter = new StreamWriter(MyRequestStrearm,Encoding.ASCII);
41. //把数据写入HttpWebRequest的Request流
42. MyStreamWriter.Write(strArgs);
43. //关闭打开对象
44. MyStreamWriter.Close();
45. MyRequestStrearm.Close();
46.  
47. HttpWebResponse response = null;
48. System.IO.StreamReader sr = null;
49. response = (HttpWebResponse)myHttpWebRequest.GetResponse();
50.  
51. cookieHeader = myHttpWebRequest.CookieContainer.GetCookieHeader(new Uri(strURL));
52. HttpContext.Current.Application.Lock();
53. HttpContext.Current.Application["cookieHeader"] = cookieHeader;
54. HttpContext.Current.Application.UnLock();
55. myCookies = response.Cookies;
56.  
57. sr = new System.IO.StreamReader(response.GetResponseStream(),Encoding.GetEncoding("gb2312")); // //utf-8
58. strResult = sr.ReadToEnd();
59. return strResult;
60. }
61.  
62. /**//// <summary>
63. /// 功能描述：在PostLogin成功登录后记录下Headers中的cookie，然后获取此网站上其他页面的内容
64. /// </summary>
65. /// <param name="strURL">获取网站的某页面的地址</param>
66. /// <param name="strReferer">引用的地址</param>
67. /// <returns>返回页面内容</returns>
68. public static string GetPage(string strURL,string strReferer)
69. {
70. string strResult = "";
71. HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(strURL);
72. myHttpWebRequest.ContentType = "text/html";
73. myHttpWebRequest.Method = "GET";
74. myHttpWebRequest.Referer = strReferer;
75. myHttpWebRequest.Headers.Add("cookie:"+ cookieHeader);
76.  
77. HttpWebResponse response = null;
78. System.IO.StreamReader sr = null;
79. response = (HttpWebResponse)myHttpWebRequest.GetResponse();
80. sr = new System.IO.StreamReader(response.GetResponseStream(), Encoding.GetEncoding("gb2312")); // //utf-8
81. strResult = sr.ReadToEnd();
82. return strResult;
83. }

 

 

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