使用VB.net从https下载文件

Question

有人可以帮我吗？

我需要使用vb.net从网络（即https：//www.xxx.com \\）下载文件，并将其保存到系统的C驱动器中。

下面是代码：

Dim URI As String = ftpHost & ftpFile
Dim oRequest As System.Net.HttpWebRequest = CType(HttpWebRequest.Create(URI), HttpWebRequest)
oRequest.Credentials = New System.Net.NetworkCredential(userName, pwd)        
Using oResponse As System.Net.WebResponse = CType(oRequest.GetResponse, System.Net.WebResponse)
    Using responseStream As IO.Stream = oResponse.GetResponseStream
        Using fs As New IO.FileStream(localFile, FileMode.Create, FileAccess.Write)
            Dim buffer(2047) As Byte
            Dim read As Integer
            Do
            read = responseStream.Read(buffer, 0,buffer.Length)
                fs.Write(buffer, 0, read)
            Loop Until read = 0
            responseStream.Close()
            fs.Flush()
            fs.Close()
        End Using
        responseStream.Close()
    End Using
    oResponse.Close()
End Using

但这什么也没读。

提前致谢。

Answer 1

我运行了您的代码，从https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.js下载了最新的jQuery库，一切正常。 我使用了'name'/'pwd'的虚拟用户名/密码。 我唯一能想到的是您的凭证无效。 如果您更改代码以下载上面提到的jQuery文件，那么它行得通吗？ 如果是这样，我将看看您传递的信用，以及如何在服务器端处理它们。

希望这可以帮助。

-修改后的代码-

    Dim URI As String = "https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.js"
    Dim oRequest As System.Net.HttpWebRequest = CType(HttpWebRequest.Create(URI), HttpWebRequest)
    oRequest.Credentials = New System.Net.NetworkCredential("name", "pwd")
    Using oResponse As System.Net.WebResponse = CType(oRequest.GetResponse, System.Net.WebResponse)
        Using responseStream As IO.Stream = oResponse.GetResponseStream
            Using fs As New IO.FileStream("c:\temp\jquery-1.4.2.js", FileMode.Create, FileAccess.Write)
                Dim buffer(2047) As Byte
                Dim read As Integer
                Do
                    read = responseStream.Read(buffer, 0, buffer.Length)
                    fs.Write(buffer, 0, read)
                Loop Until read = 0
                responseStream.Close()
                fs.Flush()
                fs.Close()
            End Using
            responseStream.Close()
        End Using
        oResponse.Close()
    End Using

Answer 2

看看这个http://www.devhood.com/messages/message_view-2.aspx?thread_id=39924

Answer 3

您的目标站点https://foo.com/bar.txt是否提供foo.com或其他站点的证书？

如果它没有foo.com的证书，则可能是问题的一部分。