使用 S3 URL 从 S3 存储桶读取文本文件内容

Question

我需要读取上传到 AWS S3 存储桶中的文本文件的内容。我有位于 S3 存储桶中的文件的 URL。有人可以帮我阅读使用 S3 URL 的文本文件内容。

我知道我们可以使用 ResponseStream 读取数据，但想使用 URL/路径读取它。我需要使用 .NET Core 创建 AWS Lambda 服务。下面的代码突出显示了如何使用 ResponseStream 读取它

using (GetObjectResponse response = await _client.GetObjectAsync(requestGet))
using (Stream responseStream = response.ResponseStream)
using (StreamReader reader = new StreamReader(responseStream))

Answer 1

AWS .Net SDK 是您问题的答案：

-通过在请求中提供桶名和对象键来执行getObject方法。

-执行 GetObjectResponse 方法之一来处理流。

以下是来自 AWS link 的相同示例：

using Amazon.S3;
using Amazon.S3.Model;
using System;
using System.IO;
using System.Threading.Tasks;

namespace Amazon.DocSamples.S3
{
    class GetObjectTest
    {
        private const string bucketName = "*** bucket name ***";
        private const string keyName = "*** object key ***";
        // Specify your bucket region (an example region is shown).
        private static readonly RegionEndpoint bucketRegion = RegionEndpoint.USWest2;
        private static IAmazonS3 client;

        public static void Main()
        {
            client = new AmazonS3Client(bucketRegion);
            ReadObjectDataAsync().Wait();
        }

        static async Task ReadObjectDataAsync()
        {
            string responseBody = "";
            try
            {
                GetObjectRequest request = new GetObjectRequest
                {
                    BucketName = bucketName,
                    Key = keyName
                };
                using (GetObjectResponse response = await client.GetObjectAsync(request))
                using (Stream responseStream = response.ResponseStream)
                using (StreamReader reader = new StreamReader(responseStream))
                {
                    string title = response.Metadata["x-amz-meta-title"]; // Assume you have "title" as medata added to the object.
                    string contentType = response.Headers["Content-Type"];
                    Console.WriteLine("Object metadata, Title: {0}", title);
                    Console.WriteLine("Content type: {0}", contentType);

                    responseBody = reader.ReadToEnd(); // Now you process the response body.
                }
            }
            catch (AmazonS3Exception e)
            {
                Console.WriteLine("Error encountered ***. Message:'{0}' when writing an object", e.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine("Unknown encountered on server. Message:'{0}' when writing an object", e.Message);
            }
        }
    }
}