Amazon s3 将文件上载到AmazonS3

让我解释一下我的要求

我想将（客户端）上传到我的应用程序的文件存储到Amazon S3

文件大小~1-10 MB

但是，客户端接口必须是RESTAPI 由我的申请提供。因此，在解析文件上传（HTTPPOST）请求之后，我的应用程序必须将文件存储在S3中

因此，在上传到S3之前，我必须将文件临时存储在磁盘上 有解决办法吗？我可以取消服务器上的临时文件存储吗。。如果我不清楚，请告诉我

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编辑-可以从FileItem对象获取字节数组并存储它而不是文件本身吗？

您的全部想法是避免I/O，对吗？在上传之前不需要保存文件，只需将字节数组发送到AmazonRESTAPI即可

下面是我的示例VB.NET代码，可以进行上载和下载：

Imports System.Collections.Generic
Imports System.IO
Imports System.Linq
Imports System.Net
Imports System.Security.Cryptography
Imports System.Text
Imports System.Threading.Tasks
Module Module1
  Sub Main()
    Dim obj As New Program
    obj.UploadFile()
    'obj.DownloadFile() 'Download Example
  End Sub
End Module

Class Program
  Private Const KeyId As String = "yourkey"
  Private Const AccessKey As String = "your/access"
  Private Const S3Url As String = "https://s3.amazonaws.com/"

  Public Sub DownloadFile()

    Dim bucketName As String = "yourbucket"
    Dim FileName As String = "file.png"
    Dim timeStamp As String = String.Format("{0:r}", DateTime.UtcNow)
    Dim stringToConvert As String = Convert.ToString((Convert.ToString((Convert.ToString("GET" & vbLf + vbLf + vbLf + vbLf + "x-amz-date:") & timeStamp) + vbLf + "/") & bucketName) + "/") & FileName

    Dim ae = New UTF8Encoding()
    Dim signature = New HMACSHA1() With { _
       .Key = ae.GetBytes(AccessKey) _
    }
    Dim bytes = ae.GetBytes(stringToConvert)
    Dim moreBytes = signature.ComputeHash(bytes)
    Dim encodedCanonical = Convert.ToBase64String(moreBytes)

    ' Send the request
    Dim request As HttpWebRequest = DirectCast(HttpWebRequest.Create(Convert.ToString((Convert.ToString("https://") & bucketName) + ".s3.amazonaws.com" + "/") & FileName), HttpWebRequest)
    'request.ContentType = "application/octet-stream";
    request.Headers.Add("x-amz-date", timeStamp)
    request.Headers.Add("Authorization", "AWS " + KeyId + ":" + encodedCanonical)
    request.Method = "GET"

    ' Get the response
    Dim response As HttpWebResponse = DirectCast(request.GetResponse(), HttpWebResponse)
    Dim ReceiveStream As Stream = response.GetResponseStream()

    Console.WriteLine(response.StatusCode)
  End Sub

  Public Sub UploadFile()
    Dim fileData = File.ReadAllBytes("C:\file.png")

    Dim timeStamp As String = String.Format("{0:r}", DateTime.UtcNow)

    Dim stringToConvert As String = (Convert.ToString("PUT" & vbLf + vbLf + "application/octet-stream" & vbLf + vbLf + "x-amz-acl:public-read" + vbLf + "x-amz-date:") & timeStamp) + vbLf + "/celso711/file.png"
    'resource
    Dim ae = New UTF8Encoding()
    Dim signature = New HMACSHA1() With { _
      .Key = ae.GetBytes(AccessKey) _
    }
    Dim bytes = ae.GetBytes(stringToConvert)
    Dim moreBytes = signature.ComputeHash(bytes)
    Dim encodedCanonical = Convert.ToBase64String(moreBytes)

    Dim url = "https://bucket.s3.amazonaws.com/file.png"

    Dim request = TryCast(WebRequest.Create(url), HttpWebRequest)
    request.Method = "PUT"
    request.Headers("x-amz-date") = timeStamp
    request.Headers("x-amz-acl") = "public-read"
    request.ContentType = "application/octet-stream"
    request.ContentLength = fileData.Length
    request.Headers("Authorization") = (Convert.ToString("AWS ") & KeyId) + ":" + encodedCanonical

    Dim requestStream = request.GetRequestStream()
    requestStream.Write(fileData, 0, fileData.Length)
    requestStream.Close()

    Using response = TryCast(request.GetResponse(), HttpWebResponse)
      Dim reader = New StreamReader(response.GetResponseStream())
      Dim data = reader.ReadToEnd()
    End Using
  End Sub
End Class