如何使用HttpWebRequest下载文件 [英] How to use HttpWebRequest to download file

问题描述

尝试在代码中下载文件.

Trying to download file in code.

当前代码:

  Dim uri As New UriBuilder
    uri.UserName = "xxx"
    uri.Password = "xxx"
    uri.Host = "xxx"
    uri.Path = "xxx.aspx?q=65"

   Dim request As HttpWebRequest = DirectCast(WebRequest.Create(uri.Uri), HttpWebRequest)

    request.AllowAutoRedirect = True

    request = DirectCast(WebRequest.Create(DownloadUrlIn), HttpWebRequest)
    request.Timeout = 10000
    'request.AllowWriteStreamBuffering = True

    Dim response As HttpWebResponse = Nothing
    response = DirectCast(request.GetResponse(), HttpWebResponse)
    Dim s As Stream = response.GetResponseStream()

    'Write to disk
    Dim fs As New FileStream("c:xxx.pdf", FileMode.Create)

    Dim read As Byte() = New Byte(255) {}
    Dim count As Integer = s.Read(read, 0, read.Length)
    While count > 0
        fs.Write(read, 0, count)
        count = s.Read(read, 0, read.Length)
    End While

    'Close everything
    fs.Close()
    s.Close()
    response.Close()

运行此代码并检查 response.ResponseUri 表明我被重定向回登录页面而不是 pdf 文件.

Running this code and checking the response.ResponseUri indicates im being redirected back to the login page and not to the pdf file.

出于某种原因，它没有授权访问我在 uri 中发送用户名和密码时可能会遗漏什么?感谢您的帮助

For some reason its not authorising access what could I be missing as Im sending the user name and password in the uri? Thanks for your help

推荐答案

从网上下载文件不需要所有这些代码只需使用 WebClient 类及其 DownloadFile 方法

You don't need all of that code to download a file from the net just use the WebClient class and its DownloadFile method

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