C#用HttpWebRequest通过代理服务器验证后抓取网页内容 。。。。。

string urlStr = "http://www.domain.com"; //設定要獲取的地址
HttpWebRequest hwr = (HttpWebRequest)HttpWebRequest.Create(urlStr); //建立HttpWebRequest對象
hwr.Timeout = 60000; //定義服務器超時時間
WebProxy proxy = new WebProxy(); //定義一個網關對象
proxy.Address = new Uri("http://proxy.domain.com:3128"); //網關服務器:端口
proxy.Credentials = new NetworkCredential("f3210316", "6978233"); //用戶名,密碼
hwr.UseDefaultCredentials = true; //啟用網關認証
hwr.Proxy = proxy; //設置網關
HttpWebResponse hwrs = (HttpWebResponse)hwr.GetResponse(); //取得回應
Stream s = hwrs.GetResponseStream(); //得到回應的流對象
StreamReader sr = new StreamReader(s, Encoding.UTF8); //以UTF-8編碼讀取流
StringBuilder content = new StringBuilder(); //
while (sr.Peek() != -1) //每次讀取一行,直到
{ //下一個字節沒有內容
content.Append(sr.ReadLine()+"\r\n"); //返回為止
} //
return content.ToString() ; //返回得到的字符串