比如：
<form name="login" action="loginMain.jsp" method="POST" target="_top">
<table width="218" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="50" height="28" class="hui"><div align="right">用户名：</div></td>
<td width="168" height="28"><input class="hui" id="username"
maxlength="40" size="23" name="username" id="username" /></td>
</tr>
<tr>
<td height="28" class="hui"><div align="right">密 码：</div></td>
<td height="28"><input class="hui" id="passwd"
maxlength="40" size="23" name="passwd" type="password" id="passwd" /></td>
</tr>
</table>
</form>
从以上表单可以看出，表单提交的方法是：POST，提交至loginMain.jsp处理,共有两个表单项即：username、passwd
1
using System;
2using System.Data;
3using System.Net;
4using System.Text;
5using System.IO;
6using System.Text.RegularExpressions;
7
8
/**//// <summary>
9
/// 登录网站并获取Cookies
10 /// </summary>
11
/// <returns>成功登录的Cookie信息</returns>
12public static CookieContainer Get_Login()
13 
{
14 CookieContainer cc = new CookieContainer();
15 string FormURL="http://blog.hnce.net/loginMain.jsp"; //处理表单的绝对URL地址
16 string FormData = "username=slick&passwd=hedy12345"; //表单需要提交的参数，注意改为你已注册的信息。
17 ASCIIEncoding encoding = new ASCIIEncoding();
18 byte[] data = encoding.GetBytes(FormData);
19
20 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(FormURL);
21 request.Method = "POST"; //数据提交方式
22 request.ContentType = "application/x-www-form-urlencoded";
23 request.ContentLength = data.Length;
24 request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)";
25 //模拟一个UserAgent
26 Stream newStream = request.GetRequestStream();
27 newStream.Write(data, 0, data.Length);
28
29 newStream.Close();
30
31 request.CookieContainer = cc;
32
33 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
34 cc.Add(response.Cookies);
35 Stream stream = response.GetResponseStream();
36 string WebContent = new StreamReader(stream, System.Text.Encoding.Default).ReadToEnd();
37 return cc;
38}
调用以上的方法来获取需要登录才能查看的内容。
using System;2
using System.Data;3
using System.Net;4
using System.Text;5
using System.IO;6
using System.Text.RegularExpressions;7
8
/**//// <summary>
9
/// 登录网站并获取Cookies10
/// </summary>11
/// <returns>成功登录的Cookie信息</returns>12
public static CookieContainer Get_Login()13
{14
CookieContainer cc = new CookieContainer();15
string FormURL="http://blog.hnce.net/loginMain.jsp"; //处理表单的绝对URL地址16
string FormData = "username=slick&passwd=hedy12345"; //表单需要提交的参数，注意改为你已注册的信息。17
ASCIIEncoding encoding = new ASCIIEncoding();18
byte[] data = encoding.GetBytes(FormData);19
20
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(FormURL);21
request.Method = "POST"; //数据提交方式22
request.ContentType = "application/x-www-form-urlencoded";23
request.ContentLength = data.Length;24
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)";25
//模拟一个UserAgent26
Stream newStream = request.GetRequestStream();27
newStream.Write(data, 0, data.Length);28
29
newStream.Close();30
31
request.CookieContainer = cc;32
33
HttpWebResponse response = (HttpWebResponse)request.GetResponse();34
cc.Add(response.Cookies);35
Stream stream = response.GetResponseStream();36
string WebContent = new StreamReader(stream, System.Text.Encoding.Default).ReadToEnd();37
return cc;38
} CookieContainer cc = new CookieContainer(); cc = Login.Get_Login(); //获取登录Cookies string PhotoClassURL = "http://blog.hnce.net/xxx.jsp"; HttpWebRequest Myrequest = (HttpWebRequest)WebRequest.Create(PhotoClassURL); Myrequest.CookieContainer = cc; HttpWebResponse Myresponse = (HttpWebResponse)Myrequest.GetResponse(); cc.Add(Myresponse.Cookies); Stream Mystream = Myresponse.GetResponseStream(); string sHtml = new StreamReader(Mystream, System.Text.Encoding.Default).ReadToEnd();