上传零大小文件，FTP文件上传 [英] Zero size files uploaded with FTP FileUpload

问题描述

我最近一直在读对ASP.NET FTP上传文章采空区，他们似乎都有道理，但每次我试过一次执行这些我要么得到上传一个空文件，或根本没有档案。这里有一些我一直在阅读文章的：

I've been reading gobs of articles on FTP upload in ASP.NET recently and they all seem to make sense, but every time I've tried implementing them I either get an empty file uploaded, or no file at all. Here are some of the articles I've been reading:

• 从ASP.NET网页通过约翰·管理FTP传输彼得森


• FileUpload控件不给完整路径...。帮助!!!!


• 如何：在文件上传文件上传Web服务器控件

• Managing FTP Transfers from an ASP.NET Web Page By John Peterson
• FileUpload Control Doesn’t Give Full Path….HELP!!!!
• How to: Upload Files with the FileUpload Web Server Control

他们都是伟大的文章，但就像我说的，有问题：（

They're all great articles, but like I said, having issues :(

我知道问题到底是什么，但我不知道如何解决它。我可以从FileUpload控件传递文件名，但路径没有为安全问题存在。然而，StreamReader对象要求要上载的文件的完全合格的路径，所以到底怎么做我明白了吗？我在我无计可施！ >＆LT;

I know exactly what the problem is but I don't know how to fix it. I can pass the file name from the FileUpload control, but the path does not exist for security concerns. However, the StreamReader object requires the fully qualified path of the file to be uploaded, so how the heck do I get that? I'm at my wits end! >.<

让我们用约翰·彼得森的例子，我上面链接。这里的code：

Let's use the example by John Peterson that I linked above. Here's the code:

Protected Sub btnUploadFile_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim myFtpWebRequest As FtpWebRequest
    Dim myFtpWebResponse As FtpWebResponse
    Dim myStreamWriter As StreamWriter

    myFtpWebRequest = WebRequest.Create("ftp://ftp_server_name/filename.ext")
    myFtpWebRequest.Method = WebRequestMethods.Ftp.UploadFile
    myFtpWebRequest.UseBinary = True

    myStreamWriter = New StreamWriter(myFtpWebRequest.GetRequestStream())

    'IT BREAKS HERE BECAUSE THE CLIENT PATH IS WRONG!!
    myStreamWriter.Write(New StreamReader(Server.MapPath("filename.ext")).ReadToEnd)
    myStreamWriter.Close()

    myFtpWebResponse = myFtpWebRequest.GetResponse()
    myFtpWebResponse.Close()
End Sub

看到了吗？在上传的文件无数据：（

See? No data in the uploaded file :(

现在我最新的实施看起来是这样，但上传的文件比源大得多，损坏。说真的，你到底我做错了什么？我一直在两个长天这个，哎呀...

Now my latest implementation looks like this, but the uploaded file is much larger than the source, and corrupted. Seriously, what the heck am I doing wrong? I've been two LONG days at this, grrr...

Protected Sub btnUploadFile2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim myFtpWebRequest As FtpWebRequest
    Dim myFtpWebResponse As FtpWebResponse

    filename = Path.GetFileName(FileUpload1.FileName)

    myFtpWebRequest = CType(WebRequest.Create(ftpServer + ftpPath + filename), FtpWebRequest)
    myFtpWebRequest.Method = WebRequestMethods.Ftp.UploadFile
    myFtpWebRequest.UseBinary = True

    'NEW APPROACH USING THE STREAM OF THE FILE FROM THE FileUpload Control
    'CORRECT BYTE LENGTH - in sourceStream.BaseStream
    Dim sourceStream As New StreamReader(FileUpload1.FileContent)
    'WRONG BYTE LENGTH - in sourceStream.ReadToEnd()
    Dim fileContents As Byte() = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd())
    sourceStream.Close()
    myFtpWebRequest.ContentLength = fileContents.Length

    Dim requestStream As Stream = myFtpWebRequest.GetRequestStream()
    requestStream.Write(fileContents, 0, fileContents.Length)
    requestStream.Close()

    myFtpWebResponse = CType(myFtpWebRequest.GetResponse(), FtpWebResponse)
    myFtpWebResponse.Close()
End Sub

万分感谢亚当马拉什的惊人答案。我在这里留下我的失误给别人造福谁找到这个线程;）

Thanks ever so much to Adam Maras for the amazing answer. I'll leave my blunders here for others to benefit who find this thread ;)

推荐答案

首先，你的必须的通过web服务器上传，如果你要使用ASP.NET这样。无需安装客户端的浏览器插件或使用ActiveX控件（或类似）你绝对的不能直接从客户机上传到FTP服务器上。

First of all, you must upload through the web server if you're going to use ASP.NET like this. Without installing a plugin on the client's browser or using an ActiveX control (or similar) you absolutely cannot upload directly from the client machine to the FTP server.

我假设你要上传的二进制文件;如果是这样的话，你使用的方式的StreamReader 和的StreamWriter 取值可能被破坏的二进制内容文件。相反，我们可以使用 Stream.CopyTo 方法从一个流逐字移动数据到另一个

I assume you're uploading binary files; if that's the case, the way you're using StreamReaders and StreamWriters could be corrupting the binary contents of the file. Instead, we can use the Stream.CopyTo method to move the data verbatim from one stream to the other.

我修改你的使用这种模式，而不是方法：

I've modified your method to use this pattern instead:

Protected Sub btnUploadFile2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    Dim myFtpWebRequest As FtpWebRequest
    Dim myFtpWebResponse As FtpWebResponse

    filename = Path.GetFileName(FileUpload1.FileName)

    myFtpWebRequest = CType(WebRequest.Create(ftpServer + ftpPath + filename), FtpWebRequest)
    myFtpWebRequest.Method = WebRequestMethods.Ftp.UploadFile
    myFtpWebRequest.UseBinary = True

    Dim myFileStream As Stream = FileUpload1.FileContent
    myFtpWebRequest.ContentLength = myFileStream.Length

    Dim requestStream As Stream = myFtpWebRequest.GetRequestStream()
    myFileStream.CopyTo(requestStream)
    requestStream.Close()

    myFtpWebResponse = CType(myFtpWebRequest.GetResponse(), FtpWebResponse)
    myFtpWebResponse.Close()
End Sub

这篇关于上传零大小文件，FTP文件上传的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！