asp.net c#采集需要登录页面的实现原理及代码

复制代码 代码如下:

protected void Page_Load(object sender, EventArgs e)
{
//设置Cookie，存入Hashtable
Hashtable ht = new Hashtable();
ht.Add("username", "youraccount");
ht.Add("id", "yourid");
this.Collect(ht);
}
public void Collect(Hashtable ht)
{
string content = string.Empty;
string url = "http://www.ibest100.com/需要登录后才能采集的页面";
string host = "http://www.ibest100.com";
try
{
//获取提交的字节
byte[] bs = Encoding.UTF8.GetBytes(content);
//设置提交的相关参数
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
req.Method = "POST";
req.ContentType = "application/json;charset=utf-8";
req.ContentLength = bs.Length;
//将Cookie放入CookieContainer，然后再将CookieContainer添加到HttpWebRequest
CookieContainer cc = new CookieContainer();
cc.Add(new Uri(host), new Cookie("username", ht["username"].ToString()));
cc.Add(new Uri(host), new Cookie("id", ht["id"].ToString()));
req.CookieContainer = cc;
//提交请求数据
Stream reqStream = req.GetRequestStream();
reqStream.Write(bs, 0, bs.Length);
reqStream.Close();
//接收返回的页面，必须的，不能省略
WebResponse wr = req.GetResponse();
System.IO.Stream respStream = wr.GetResponseStream();
System.IO.StreamReader reader = new System.IO.StreamReader(respStream, System.Text.Encoding.GetEncoding("utf-8"));
string t = reader.ReadToEnd();
System.Web.HttpContext.Current.Response.Write(t);
wr.Close();
}
catch (Exception ex)
{
System.Web.HttpContext.Current.Response.Write("异常在getPostRespone:" + ex.Source + ":" + ex.Message);
}
}

复制代码 代码如下:

protected void Page_Load(object sender, EventArgs e)
{
try
{
CookieContainer cookieContainer = new CookieContainer();
string formatString = "username={0}&password={1}";//***************
string postString = string.Format(formatString, "youradminaccount", "yourpassword");
//将提交的字符串数据转换成字节数组
byte[] postData = Encoding.UTF8.GetBytes(postString);
//设置提交的相关参数
string URI = "http://www.ibest100.com/登录页面";//***************
HttpWebRequest request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "POST";
request.KeepAlive = false;
request.ContentType = "application/x-www-form-urlencoded";
request.CookieContainer = cookieContainer;
request.ContentLength = postData.Length;
// 提交请求数据
System.IO.Stream outputStream = request.GetRequestStream();
outputStream.Write(postData, 0, postData.Length);
outputStream.Close();
//接收返回的页面，必须的，不能省略
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
System.IO.Stream responseStream = response.GetResponseStream();
System.IO.StreamReader reader = new System.IO.StreamReader(responseStream, Encoding.GetEncoding("gb2312"));
string srcString = reader.ReadToEnd();
//打开您要访问的页面
URI = "http://www.ibest100.com/需要登录后才能采集的页面";//***************
request = WebRequest.Create(URI) as HttpWebRequest;
request.Method = "GET";
request.KeepAlive = false;
request.CookieContainer = cookieContainer;
// 接收返回的页面
response = request.GetResponse() as HttpWebResponse;
responseStream = response.GetResponseStream();
reader = new System.IO.StreamReader(responseStream, Encoding.GetEncoding("gb2312"));
srcString = reader.ReadToEnd();
//输出获取的页面或者处理
Response.Write(srcString);
}
catch (WebException we)
{
string msg = we.Message;
Response.Write(msg);
}
}