I was unable to find any documentation on how to empty an Amazon S3 bucket programmatically in Java. Any help will be appreciated.

CodePudding user response：

To delete Amazon S3 objects using Java, you can use the AWS SDK for Java V2. To empty a bucket, first get a list of all objects in the Bucket using this code:

public static void listBucketObjects(S3Client s3, String bucketName ) {

       try {
            ListObjectsRequest listObjects = ListObjectsRequest
                    .builder()
                    .bucket(bucketName)
                    .build();

            ListObjectsResponse res = s3.listObjects(listObjects);
            List<S3Object> objects = res.contents();

            for (ListIterator iterVals = objects.listIterator(); iterVals.hasNext(); ) {
                S3Object myValue = (S3Object) iterVals.next();
                System.out.print("\n The name of the key is "   myValue.key());
                System.out.print("\n The object is "   calKb(myValue.size())   " KBs");
                System.out.print("\n The owner is "   myValue.owner());

             }

        } catch (S3Exception e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

For each object, you can delete it using this code:

 public static void deleteBucketObjects(S3Client s3, String bucketName, String objectName) {

    ArrayList<ObjectIdentifier> toDelete = new ArrayList<ObjectIdentifier>();
    toDelete.add(ObjectIdentifier.builder().key(objectName).build());

    try {
        DeleteObjectsRequest dor = DeleteObjectsRequest.builder()
                .bucket(bucketName)
                .delete(Delete.builder().objects(toDelete).build())
                .build();
        s3.deleteObjects(dor);
    } catch (S3Exception e) {
        System.err.println(e.awsErrorDetails().errorMessage());
        System.exit(1);
    }
    System.out.println("Done!");
}

You can find these examples and many others in AWS Github here:

Amazon S3 Java code examples