Question

我正在尝试从亚马逊s3下载文件。我正在使用.NET sdk。我写下了以下代码：

GetObjectRequest request = new GetObjectRequest()
    .WithKey("abc/xyz.jpg")
    .WithBucketName(appConfig);

using (GetObjectResponse response = s3Client.GetObject(request))
{
    int numBytesToRead = (int)response.ContentLength;
    if (numBytesToRead > 0)
    {
        int numBytesRead = 0;
        byte[] buffer = new byte32768;
        using (FileStream fstream = new FileStream(@"C:\abc\xyz.jpg", FileMode.Create))
        {
            using (Stream responseStream = response.ResponseStream)
            {
                do
                {
                    numBytesRead = responseStream.Read(buffer, 0, buffer.Length);
                    fstream.Write(buffer, 0, numBytesRead);
                }
                while (numBytesRead > 0);
            }
        }
    }
}

使用此代码，我可以下载文件。但现在我想下载多个文件。首先，我列出了s3上可用的所有文件，然后将其存储在arraylist中，之后调用我的每个文件的下载功能。

在使用后调用下载函数运行列表文件方法后（GetObjectResponse response = s3Client.GetObject（request））我得到了异常。

{“拒绝访问”}

Stack trace:
at Amazon.S3.AmazonS3Client.processRequestError(String actionName, HttpWebRequest request, WebException we, HttpWebResponse errorResponse, String requestAddr, WebHeaderCollection& respHdrs, Type t, Exception& cause)
at Amazon.S3.AmazonS3Client.handleHttpWebErrorResponse(S3Request userRequest, WebException we, HttpWebRequest request, HttpWebResponse httpResponse, Exception& cause, HttpStatusCode& statusCode)
at Amazon.S3.AmazonS3Client.getResponseCallback[T](IAsyncResult result)
at Amazon.S3.AmazonS3Client.endOperation[T](IAsyncResult result)
at Amazon.S3.AmazonS3Client.EndGetObject(IAsyncResult asyncResult)
at Amazon.S3.AmazonS3Client.GetObject(GetObjectRequest request)
at ScreenshotsUploader.ScreenshotsUploader.downloadFile(AmazonS3 s3Client, NameValueCollection appConfig) in c:\Users\xyz\Documents\Visual Studio 2012\Projects\ScreenshotsUploader\ScreenshotsUploader\ScreenshotsUploader.cs:line 220
at ScreenshotsUploader.ScreenshotsUploader.GetServiceOutput() in c:\Users\xyz\Documents\Visual Studio 2012\Projects\ScreenshotsUploader\ScreenshotsUploader\ScreenshotsUploader.cs:line 55

状态代码：

System.Net.HttpStatusCode.Forbidden

我需要做些什么来解决这个问题？

我也尝试过不同的下载文件方法并得到了同样的错误：

第二种方法：

string fileToDownload = @"xyzjpg";
string saveToo = @"C:\xyz.jpg";
TransferUtilityDownloadRequest request = new TransferUtilityDownloadRequest().WithBucketName(appConfig).WithKey(fileToDownload).WithFilePath(saveToo);
TransferUtility tu = new TransferUtility(s3Client);
tu.Download(request);

提前致谢。

Answer 1

public Stream DownloadS3Object(string awsBucketName, string keyName)
{

    using (var client = Amazon.AWSClientFactory.CreateAmazonS3Client())
    {
        Stream imageStream = new MemoryStream();
        GetObjectRequest request = new GetObjectRequest { BucketName = awsBucketName, Key = keyName };
        using (GetObjectResponse response = client.GetObject(request))
        {
            response.ResponseStream.CopyTo(imageStream);
        }
        imageStream.Position = 0;
        // Clean up temporary file.
        // System.IO.File.Delete(dest);
        return imageStream;
    }
}

传递函数获取流路径中的值将其保存在文件夹中，使用下面的内容。

SaveStreamToFile(foldername + "/", MainStreamAwsPath);

并且您可以应用简单的c＃代码来下载该文件夹。

从amazon s3下载文件时出错

1 个答案: