[.Net] S3 첨부파일 업로드/다운로드 예제

매우 간단한 AWS S3 첨부파일 업로드/다운로드 예제

1. 먼저 .NET 개발환경을 설정 후, 아래 링크를 참고하여 AWS .NET SDK를 설치합니다.

https://docs.aws.amazon.com/sdk-for-net/v3/developer-guide/net-dg-install-assemblies.html

Install AWSSDK Assemblies - AWS SDK for .NET

2. S3 업로드 예제

         
        // 첨부파일 업로드
        public void UploadToS3(string pBucketName, string pKey, string pFile)
        {
            string pAccessKey = "AWS_ACCESS_KEY";
            string pSecretKey = "AWS_SECRET_KEY";
            string pRegion = "AWS_RegionEnd_Point"
            try
            {
                //AWS정보 셋팅
                AmazonS3Config config = new AmazonS3Config();
                config.RegionEndpoint = RegionEndpoint.GetBySystemName(pRegion);
                s3Client = new AmazonS3Client(pAccessKey, pSecretKey, config);
 
                //S3에 업로드하기위한 Request 객체 
                var putRequest1 = new PutObjectRequest
                {
                    BucketName = pBucketName,
                    Key = pKey,
                    FilePath = pFileInfo.FullName
                };
 
                PutObjectResponse s3PutResponse = s3Client.PutObject(putRequest1);
 
            }
            catch (Exception ex)
            {
                //Exception
            }
        }
 
        //호출예제
        UploadToS3("BackStorage", "/04042020/Etc", "D:\\TempStorage\\MyFile.txt");
 

3. S3 다운로드 예제

 
    // 첨부파일 다운로드
    private void DownloadFromS3(string pBucketName,string pKey, string pFileDisplayName,bool pIsCache = false)
    {
        string pAccessKey = "AWS_ACCESS_KEY";
        string pSecretKey = "AWS_SECRET_KEY";
        string pRegion = "AWS_RegionEnd_Point"
        //AWS정보 셋팅
        AmazonS3Config config = new AmazonS3Config();
        config.RegionEndpoint = RegionEndpoint.GetBySystemName(pRegion );        
        s3Client = new AmazonS3Client(pAccessKey , pSecretKey , config);
 
        //다운로드받을 S3객체 정보
        GetObjectRequest oRequest = new GetObjectRequest();
        oRequest.BucketName = pBucketName;
        oRequest.Key = pKey;
        
        GetObjectResponse oResponse = s3Client.GetObject(oRequest);
 
        Response.Clear();
        if (pIsCache)
        {
            //Response.AppendHeader("Cache-Control", "public");
            Response.AppendHeader("Cache-Control", "max-age=5184000‬");            
        }
        else
        {
            Response.AppendHeader("Pragma", "no-cache");
        }
        Response.ContentType = "application/octet-stream";
 
        if (ie)//IE 브라우져일 경우 파일 명을 URL Encodnig 처리를 해주어야함
        {
            pFileDisplayName = Server.UrlEncode(pFileDisplayName);
            pFileDisplayName = pFileDisplayName.Replace(@"+", @"%20");
        }
 
        Response.AppendHeader("Content-Disposition", string.Format("attachment; filename=\"{0}\"", pFileDisplayName));
        Response.AppendHeader("Content-Length", oResponse.ResponseStream.Length.ToString());
        Response.AppendHeader("Connection", "close");
        Response.ContentType = "application/octet-stream";
 
        var buffer = new byte[1024 * 8]; // 8k buffer. 
        int bytesRead = 0;
        using (var responseStream = oResponse.ResponseStream)
        {
            while ((bytesRead = responseStream.Read(buffer, 0, buffer.Length)) != 0)
            {
                Response.OutputStream.Write(buffer, 0, bytesRead);                
            }
        }
        Response.Flush();
 
    }