ASP.NET MVC - 将图像上传到 Amazon S3

Question

我的图像来自 Request.Files[0]。现在，我如何将此图像上传到 S3？我发现在 AWS .NET API 中，在放置字符串对象时必须指定 ContentBody。我如何获取文件的内容主体？

Answer 1

var file = Request.Files[0];
PutObjectRequest request = new PutObjectRequest();
request.BucketName = "mybucket"
request.ContentType = contentType;
request.Key = key;
request.InputStream = file.InputStream;
s3Client.PutObject(request);

Answer 2

有关如何使用文件夹以及授予所有用户只读访问权限的更详细信息。
网页：

C#

HttpPostedFileBase file = Request.Files[0];
   if (file.ContentLength > 0) // accept the file
        {
            string accessKey = "XXXXXXXXXXX";
            string secretKey = "122334XXXXXXXXXX";
            AmazonS3 client;
            using (client = Amazon.AWSClientFactory.CreateAmazonS3Client(accessKey, secretKey))
            {
                MemoryStream ms = new MemoryStream();
                PutObjectRequest request = new PutObjectRequest();
      request.WithBucketName("mybucket")
     .WithCannedACL(S3CannedACL.PublicRead)
     .WithKey("testfolder/test.jpg").InputStream = file.InputStream;
       S3Response response = client.PutObject(request);
            }

更多详细信息请参见：http: //bradoyler.com/post/3614362044/uploading-an-image-with-aws-sdk-for-net-c

Answer 3

这很可能是 Base64 编码的字符串，但您应该检查 S3 文档来确定。如果是，您应该使用 Convert.ToBase64String() 并传递它字节数组。

这里有一些您可以尝试的示例代码。我还没有测试过它，但它应该可以帮助你得到正确的想法：

if (Request.Files.Count >= 1) {
    var file = Request.Files[0];
    var fileContents = new byte[file.ContentLength];
    file.InputStream.Read(fileContents, 0, file.ContentLength);
    var fileBase64String = Convert.ToBase64String(fileContents);

    // now you can send fileBase64String to the S3 uploader
}

Answer 4

                PurObjectRequest request = new PutObjectRequest()
                {
                    BucketName = _bucketName,
                    CannedACL = S3CannedACL.PublicRead,
                    Key =  string.Format("folderyouwanttoplacethefile/{0}", file.FileName),
                    InputStream = file.InputStream
                };

                YourS3client.PutObject(request);