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HttpWebRequest自动登录网站-获取网站内容

2011-07-23 16:27 711 查看

HttpWebRequest自动登录网站并获取网站内容

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：
拦截的内容如下
POST http://www.csdn.net/member/UserLogin.aspx HTTP/1.0
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*
Referer: http://www.csdn.net/member/UserLogin.aspx Accept-Language: zh-cn
Content-Type: application/x-www-form-urlencoded
UA-CPU: x86
Pragma: no-cache
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; InfoPath.1)
Host: www.csdn.net
Content-Length: 355
Proxy-Connection: Keep-Alive
Cookie: ASPSESSIONIDAAAATBQC=FMEGGCKDBKHAMMCGKPFDMBFG; ASP.NET_SessionId=lusprmnom05lr445tmteaf55; userid=699879

__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=dDwtMTcwMzgxNjQ2Mjs7bDxDU0ROVXNlckxvZ2luOmNiX1NhdmVTdGF0ZTtDU0ROVXNlckxvZ2luOkltYWdlX0xvZ2luOz4+tu1q2wmRZoAJTi9L73w1zBleylY=&CSDNUserLogin:tb_UserName=testusername&CSDNUserLogin:tb_Password=testpassword&CSDNUserLogin:tb_ExPwd=9232&from=&CSDNUserLogin:Image_Login.x=36&CSDNUserLogin:Image_Login.y=6
GET http://www.csdn.net/mycustompage.htm?aspxerrorpath=/member/UserLogin.aspx HTTP/1.0
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*
Referer: http://www.csdn.net/member/UserLogin.aspx Accept-Language: zh-cn
UA-CPU: x86
Pragma: no-cache
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; InfoPath.1)
Host: www.csdn.net
Proxy-Connection: Keep-Alive
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=dDwtMTcwMzgxNjQ2Mjs7bDxDU0ROVXNlckxvZ2luOmNiX1NhdmVTdGF0ZTtDU0ROVXNlckxvZ2luOkltYWdlX0xvZ2luOz4+tu1q2wmRZoAJTi9L73w1zBleylY=&CSDNUserLogin:tb_UserName=testusername&CSDNUserLogin:tb_Password=testpassword&CSDNUserLogin:tb_ExPwd=9232
自动登录网站
protected static string cookieHeader;
private void Page_Load(object sender, System.EventArgs e)
{
string strReContent = string.Empty;
//登录
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/");
//asp.net登录传递的参数需注意
//strReContent = PostLogin("http://www.mystand.com.cn/login.aspx","__VIEWSTATE=dDwtNjkzMjUyNDczO3Q8O2w8aTwzPjs+O2w8dDxwPHA8bDxUZXh0Oz47bDxcZTs+Pjs+Ozs+Oz4+Oz6aX2dtqkJTK+KbNPsjd7Op/l26Iw==&txtUserName=hxf&txtPassword=hxf0000&btnEnter=登录","http://www.mystand.com.cn/login.aspx");
//获取页面
strReContent = GetPage("http://www.mystand.com.cn/company/getdata.jsp?code=","引用地址：http://www.mystand.com.cn/");
//strReContent = GetPage("http://www.mystand.com.cn/Modules/index.aspx","http://www.mystand.com.cn/login.aspx");
//可以对获得的内容进行处理：strReContent
}

/**//// <summary>
/// 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
/// </summary>
/// <param name="strURL">登录数据提交的页面地址</param>
/// <param name="strArgs">用户登录数据</param>
/// <param name="strReferer">引用地址</param>
/// <returns>可以返回页面内容或不返回</returns>
public static string PostLogin(string strURL,string strArgs,string strReferer)
{
string strResult = "";
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(strURL);
myHttpWebRequest.AllowAutoRedirect = true;
myHttpWebRequest.KeepAlive = true;
myHttpWebRequest.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/msword, application/x-shockwave-flash, */*";
myHttpWebRequest.Referer = strReferer;

myHttpWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 2.0.50727)";
myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";
myHttpWebRequest.Method = "POST";

CookieCollection myCookies = null;
CookieContainer myCookieContainer = new CookieContainer();
myHttpWebRequest.CookieContainer = myCookieContainer;

Stream MyRequestStrearm = myHttpWebRequest.GetRequestStream();
StreamWriter MyStreamWriter = new StreamWriter(MyRequestStrearm,Encoding.ASCII);
//把数据写入HttpWebRequest的Request流
MyStreamWriter.Write(strArgs);
//关闭打开对象
MyStreamWriter.Close();
MyRequestStrearm.Close();

HttpWebResponse response = null;
System.IO.StreamReader sr = null;
response = (HttpWebResponse)myHttpWebRequest.GetResponse();

cookieHeader = myHttpWebRequest.CookieContainer.GetCookieHeader(new Uri(strURL));
HttpContext.Current.Application.Lock();
HttpContext.Current.Application["cookieHeader"] = cookieHeader;
HttpContext.Current.Application.UnLock();
myCookies = response.Cookies;

sr = new System.IO.StreamReader(response.GetResponseStream(),Encoding.GetEncoding("gb2312")); // //utf-8
strResult = sr.ReadToEnd();
return strResult;
}

/**//// <summary>
/// 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
/// </summary>
/// <param name="strURL">获取网站的某页面的地址</param>
/// <param name="strReferer">引用的地址</param>
/// <returns>返回页面内容</returns>
public static string GetPage(string strURL,string strReferer)
{
string strResult = "";
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(strURL);
myHttpWebRequest.ContentType = "text/html";
myHttpWebRequest.Method = "GET";
myHttpWebRequest.Referer = strReferer;
myHttpWebRequest.Headers.Add("cookie:"+ cookieHeader);

HttpWebResponse response = null;
System.IO.StreamReader sr = null;
response = (HttpWebResponse)myHttpWebRequest.GetResponse();
sr = new System.IO.StreamReader(response.GetResponseStream(), Encoding.GetEncoding("gb2312")); // //utf-8
strResult = sr.ReadToEnd();
return strResult;

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