code: public CreateWaterMarkResponse createWaterMark(
              String bucket, String key, String horizontalAlignment, String verticalAlignment) {
  
          CreateWaterMarkRequest request =
                  new CreateWaterMarkRequest().withBucket(bucket).withKey(key)
                          .withHorizontalAlignment(horizontalAlignment)
                          .withVerticalAlignment(verticalAlignment);
  
          return createWaterMark(request);
      }
docs: Creates a water mark and return water mark ID.
  
  @param bucket  The bucket name of Bos object which you want to read.
  @param key     The key name of Bos object which your want to read.
  @param horizontalAlignment  The horizontal alignment, includes left, center, right.
  @param verticalAlignment    The vertical alignment, includes top, center, bottom.
  
  @return watermarkId the unique ID of the new water mark.