S3上ファイルのContentType取得方法

/**
   * S3上ファイルのContentTypeチェック
   * 
   * @param filePath
   * @return
   */
  public static String getContentType(String filePath) {
    String contenType = null;
    try {
      ClientConfiguration configuration = new ClientConfiguration();
      AmazonS3 s3 =
      new AmazonS3Client(awsContext.getAwsCredentials(), configuration);
      S3Object object = s3.getObject(YOUR_BACKET, filePath);
      if (object == null) {
        throw new Exception("S3 object is null : path = " + filePath);
      }
    if (object != null
      && object.getObjectMetadata() != null
      && object.getObjectMetadata().getContentType() != null) {
      contenType = object.getObjectMetadata().getContentType();
    }
    } catch (AmazonServiceException ase) {
      throw new Exception(ase);
    } catch (AmazonClientException ace) {
      throw new Exception(ace);
    }
    return contenType;
  }