使用新Java库从S3存储库下载文件的问题

Question

我正在使用以下代码从S3存储桶下载文件。

    import java.net.URI;
    import java.nio.file.Paths;
    import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
    import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
    
    import software.amazon.awssdk.regions.Region;
    import software.amazon.awssdk.services.s3.S3AsyncClient;
    import software.amazon.awssdk.services.s3.S3Client;
    import software.amazon.awssdk.services.s3.model.GetObjectRequest;
    import software.amazon.awssdk.transfer.s3.S3ClientConfiguration;
    import software.amazon.awssdk.transfer.s3.S3TransferManager;
    import software.amazon.awssdk.transfer.s3.CompletedDownload;
    import software.amazon.awssdk.transfer.s3.CompletedUpload;
    import software.amazon.awssdk.transfer.s3.Download;
    import software.amazon.awssdk.transfer.s3.DownloadRequest;
    import software.amazon.awssdk.transfer.s3.FileDownload;
    import software.amazon.awssdk.transfer.s3.Upload;
    import software.amazon.awssdk.transfer.s3.UploadRequest;
    
    /**
     *
     * @author Codnix
     */
    public class TestDownload {
    
        public static void main(String a[]) {
    
            String bucket = "plezerjams";
    
            AwsBasicCredentials awsCreds = AwsBasicCredentials.create(
                    "i am using key here",
                    "i am using my secredt key here");
    
S3AsyncClient.builder().endpointOverride(URI.create("sgp1.digitaloceanspaces.com"));
            Region newRegion = Region.of("sgp1");
    
            S3TransferManager transferManager
                    = S3TransferManager.builder()
                            .s3ClientConfiguration(cfg -> cfg.credentialsProvider(StaticCredentialsProvider.create(awsCreds))
                            .region(newRegion).endpointOverride(URI.create("https://sgp1.digitaloceanspaces.com/"))
                            .targetThroughputInGbps(20.0)
                            .minimumPartSizeInBytes(1000l))
                            .build();
            
           
   
            FileDownload download
                    = transferManager.downloadFile(b -> b.destination(Paths.get("D:\\01.jpg"))
                    .getObjectRequest(req -> req.bucket(bucket)
                    .key("/60a34de171122c0cd4b286c3/17-06-2022/29371/01.jpg")));
    
        }
    }

当我尝试在上面的数字海洋空间中下载可用的文件时，什么也不会发生。即使没有任何错误。

不确定我在做什么。任何技巧或帮助都可以解决我的问题。