从亚马逊 s3 下载文件时出错

本文关键字：出错 文件 下载 亚马逊 s3 | 更新日期: 2023-09-27 17:56:01

>我正在尝试从 amazon s3 下载文件。我正在使用.NET sdk。我已经写下了以下代码：

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。但是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，然后为每个文件调用我的下载函数。

当我在使用（GetObjectResponse response = s3Client.GetObject（request））后调用下载函数时运行列表文件方法后，我得到异常。

{"访问被拒绝"}

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

我需要做什么来解决这个问题？

我也尝试了不同的方法来下载文件，并得到相同的错误：

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);

提前谢谢。

从亚马逊 s3 下载文件时出错

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;
    }
}

在函数中传递值 获取流路径 使用以下命令将其保存在文件夹中。 

SaveStreamToFile(foldername + "/", MainStreamAwsPath);

然后，您可以应用简单的 C# 代码来下载该文件夹。

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