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"; //?O定要?@取的地址
HttpWebRequest hwr = (HttpWebRequest)HttpWebRequest.Create(urlStr); //建立HttpWebRequest?ο?
hwr.Timeout = 60000; //定?x服?掌鞒??r?r?g
WebProxy proxy = new WebProxy(); //定?x一???W?P?ο?
proxy.Address = new Uri("http://proxy.domain.com:3128"); //?W?P服?掌?:端口
proxy.Credentials = new NetworkCredential("f3210316", "6978233"); //用?裘?,密?a
hwr.UseDefaultCredentials = true; //?⒂镁W?P?J?^
hwr.Proxy = proxy; //?O置?W?P
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?ο?
StreamReader sr = new StreamReader(s, Encoding.UTF8); //以UTF-8??a?x取流
StringBuilder content = new StringBuilder(); //
while (sr.Peek() != -1) //每次?x取一行,直到
{ //下一??字??]有?热?
content.Append(sr.ReadLine()+""r"n"); //返回?橹?
} //
//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"; //?O定要?@取的地址
HttpWebRequest hwr = (HttpWebRequest)HttpWebRequest.Create(urlStr); //建立HttpWebRequest?ο?
hwr.Timeout = 60000; //定?x服?掌鞒??r?r?g
WebProxy proxy = new WebProxy(); //定?x一???W?P?ο?
proxy.Address = new Uri("http://proxy.domain.com:3128"); //?W?P服?掌?:端口
proxy.Credentials = new NetworkCredential("f3210316", "6978233"); //用?裘?,密?a
hwr.UseDefaultCredentials = true; //?⒂镁W?P?J?^
hwr.Proxy = proxy; //?O置?W?P
HttpWebResponse hwrs = (HttpWebResponse)hwr.GetResponse(); //取得回??
Stream s = hwrs.GetResponseStream(); //得到回??的流?ο?
StreamReader sr = new StreamReader(s, Encoding.UTF8); //以UTF-8??a?x取流
StringBuilder content = new StringBuilder(); //
while (sr.Peek() != -1) //每次?x取一行,直到
{ //下一??字??]有?热?
content.Append(sr.ReadLine()+""r"n"); //返回?橹?
} //
return content.ToString() ; //返回得到的字符串