c# HttpWebRequest通过代理服务器抓取网页内容应用介绍

using System.IO;
using System.Net;
public string get_html()
{
string urlStr = "http://www.domain.com"; //定要取的地址
HttpWebRequest hwr = (HttpWebRequest)HttpWebRequest.Create(urlStr); //建立HttpWebRequest象
hwr.Timeout = 60000; //定服器超
WebProxy proxy = new WebProxy(); //定一象
proxy.Address = new Uri("http://proxy.domain.com:3128"); //服器:端口
proxy.Credentials = new NetworkCredential("f3210316", "6978233"); //用名,密
hwr.UseDefaultCredentials = true; //用
hwr.Proxy = proxy; //置
try
{
HttpWebResponse hwrs = (HttpWebResponse)hwr.GetResponse(); //取得回
}
catch
{
MessageBox.Show("无法连接代理！");
return;
}
//判断HTTP响应状态
if(hwrs.StatusCode != HttpStatusCode.OK)
{
MessageBox.Show("访问失败！");
hwrs.Close();
return;
}
else
{
Stream s = hwrs.GetResponseStream(); //得到回的流象
StreamReader sr = new StreamReader(s, Encoding.UTF8); //以UTF-8取流
StringBuilder content = new StringBuilder(); //
while (sr.Peek() != -1) //每次取一行,直到
{ //下一字有容
content.Append(sr.ReadLine()+""r"n"); //返回止
} //
//return content.ToString() ;
}
//输出所有的Header（当然包括服务器输出的Cookie）
//for(int ii=0;ii<hwrs.Headers.Count;ii++)
//{
//MessageBox.Show(hwrs.Headers.GetKey(ii)+"："+res.Headers[ii]);
//}
}

string urlStr = "http://www.domain.com"; //定要取的地址
HttpWebRequest hwr = (HttpWebRequest)HttpWebRequest.Create(urlStr); //建立HttpWebRequest象
hwr.Timeout = 60000; //定服器超
WebProxy proxy = new WebProxy(); //定一象
proxy.Address = new Uri("http://proxy.domain.com:3128"); //服器:端口
proxy.Credentials = new NetworkCredential("f3210316", "6978233"); //用名,密
hwr.UseDefaultCredentials = true; //用
hwr.Proxy = proxy; //置
HttpWebResponse hwrs = (HttpWebResponse)hwr.GetResponse(); //取得回
Stream s = hwrs.GetResponseStream(); //得到回的流象
StreamReader sr = new StreamReader(s, Encoding.UTF8); //以UTF-8取流
StringBuilder content = new StringBuilder(); //
while (sr.Peek() != -1) //每次取一行,直到
{ //下一字有容
content.Append(sr.ReadLine()+""r"n"); //返回止
} //
return content.ToString() ; //返回得到的字符串