How to get values from DIV data-* attribute

问题

I need to get value of data-headline from this html through Java. Tried "getElementsByTag" and "getElementsByClass" but no luck.

  <div class="component template hidden"
    data-id="8943"
    data-page=""
    data-reviews-sort="rating"
    data-reviews-count="0"
    data-ratings-average="0"
    data-rating-counts="[]"
    data-ratings-count="0"
    data-headline="Java Code">

Any quick help is really appreciated.

来源：https://stackoverflow.com/questions/64223069/how-to-get-values-from-div-data-attribute