两个获取http页面的c#函数

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埋头苦干一天终于搞定！一个用C#写的windows应用程序，作用嘛，就是对asp程序已知的20种漏洞进行扫描，显示源程序。在这个应用程序中用到两种获得http页面的方法，一种是直接用httpwebrequest类，而另一种是同服务器通过tcp/ip建立socket连接，直接查询端口80 ， 为此我写了以下两个函数，第一个比较简单，参数只有一个，就是要求的url , 另外一个比较复杂，也很通用，不仅可以请求http页面，还可以和其他端口通信，如端口43的whois，端口25的smtp，端口21的ftp甚至pop3等等，三个参数分别是主机名，请求命令和端口。好了，看程序吧。

//获取http页面函数
private string Get_Http(string a_strUrl)
{
    string strResult;
    HttpWebRequest myReq = (HttpWebRequest)
    WebRequestFactory.Create(a_strUrl);

    try
    {
        HttpWebResponse HttpWResp = (HttpWebResponse)myReq.GetResponse();
        Stream myStream = HttpWResp.GetResponseStream();

        StreamReader sr = new StreamReader(myStream, Encoding.Default);
        StringBuilder strBuilder = new StringBuilder();
        while (-1 != sr.Peek())
        {
            strBuilder.Append(sr.ReadLine() + "\r\n");
        }

        strResult = strBuilder.ToString();
    }
    catch (Exception exp)
    {
        strResult = "错误：" + exp.Message;
    }

    return strResult;
}

//通过同server建立tcp/ip连接，发送socket命令
private string Get_Socket_Request(string a_strServer, string a_strRequest, Int32 a_intPort)
{
    //Set up variables and String to write to the server
    Encoding ASCII = Encoding.Default;
    string Get = a_strRequest + "Connection: Close\r\n\r\n";
    //string Get = 
    Byte[] ByteGet = ASCII.GetBytes(Get);
    Byte[] RecvBytes = new Byte[256];
    String strRetPage = null;

    // IPAddress and IPEndPoint represent the endpoint that will
    // receive the request
    IPAddress hostadd = DNS.Resolve(a_strServer.Substring(7, a_strServer.Length - 7));
    IPEndPoint EPhost = new IPEndPoint(hostadd, a_intPort);

    //Create the Socket for sending data over TCP
    Socket s = new Socket(AddressFamily.AfINet, SocketType.SockStream,
    ProtocolType.ProtTCP);

    // Connect to host using IPEndPoint
    if (s.Connect(EPhost) != 0)
    {
        strRetPage = "Unable to connect to host";
        return strRetPage;
    }

    // Sent the GET text to the host
    s.Send(ByteGet, ByteGet.Length, 0);

    // Receive the page, loop until all bytes are received
    Int32 bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
    strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);

    while (bytes > 0)
    {
        bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
        strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);
    }
    return strRetPage;
}