從目錄儲存貯體擷取物件中繼資料

public static void headObject(S3Client s3Client, String bucketName, String objectKey) {
     try {
         HeadObjectRequest headObjectRequest = HeadObjectRequest
                 .builder()
                 .bucket(bucketName)
                 .key(objectKey)
                 .build();
         HeadObjectResponse response = s3Client.headObject(headObjectRequest);
         System.out.format("Amazon S3 object: \"%s\" found in bucket: \"%s\" with ETag: \"%s\"", objectKey, bucketName, response.eTag());
     }
     catch (S3Exception e) {
         System.err.println(e.awsErrorDetails().errorMessage());