Amazon S3 listing “directories”

Question

I\'ve created a hierarchy in S3 via the AWS S3 Management Console. If I run the following code to list the bucket:

AmazonS3 s3 = new AmazonS3Client(CRED);
Li         


        

Answer 1

This below code worked for me to list all directories in s3.

private static String bucket_name = "";
private static String secret_key = "";
private static String access_key = "";
private static String Regions region = Regions.SELECT_REGION;

public static void main(String[] args) {
        System.out.println(listKeysInBucket(bucket_name, "/"));
    }

    public static List listKeysInBucket(String bucketName, String prefix) {
        boolean isTopLevel = false;
        String delimiter = "/";
        if (prefix.equals("") || prefix.equals(delimiter)) {
            isTopLevel = true;
        }
        if (!prefix.endsWith(delimiter)) {
            prefix += delimiter;
        }

        ListObjectsRequest listObjectsRequest = null;
        if (isTopLevel) {
            listObjectsRequest = new ListObjectsRequest().withBucketName(bucketName).withDelimiter(delimiter);
        } else {
            listObjectsRequest = new ListObjectsRequest().withBucketName(bucketName).withPrefix(prefix)
                    .withDelimiter(delimiter);
        }

        ObjectListing objects = s3Client().listObjects(listObjectsRequest);
        return objects.getCommonPrefixes();
    }

    public static AmazonS3 s3Client() {
        AWSCredentials s3Configs = new BasicAWSCredentials(access_key,secret_key);
        return AmazonS3ClientBuilder.standard()
                .withCredentials(new AWSStaticCredentialsProvider(s3Configs)).withRegion(region )
                .build();
    }