<!-- https://mvnrepository.com/artifact/org.jsoup/jsoup -->
<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.11.2</version>
</dependency>

public class RichTextParse {
    public static List<Object> parse(String body) throws Exception {
        List<Object> nodes = new ArrayList<Object>();
        Document doc = Jsoup.parse(body);
        Element rootElement = doc.body();
        for (Element element : rootElement.children()) {
            RichTextNode node = new RichTextNode();
            node.setName(element.nodeName());
            // attrs
            for (Attribute attr : element.attributes()) {
                node.getAttrs().put(attr.getKey(), attr.getValue());
            }
            // has children
            if (element.children().size() > 0) {
                loopElement(node, element);
            } else {
                RichTextNodeText nodeText = new RichTextNodeText();
                nodeText.setType("text");
                nodeText.setText(element.text());
                node.getChildren().add(nodeText);
            }
            // add to nodes
            nodes.add(node);
        }
        return nodes;
    }
    private static void loopElement(RichTextNode nodeParent, Element elementParent) {
        List<Element> eles = elementParent.children();
        for (Element element : eles) {
            RichTextNode node = new RichTextNode();
            node.setName(element.nodeName());
            // attrs
            for (Attribute attr : element.attributes()) {
                node.getAttrs().put(attr.getKey(), attr.getValue());
            }
            //
            switch (element.nodeName()) {
                case "img":
                    node.getAttrs().put("style", "max-width:100%;height:auto;");
                    break;
                default:
                    break;
            }
            // has children
            if (element.children().size() > 0) {
                loopElement(node, element);
            } else {
                RichTextNodeText nodeText = new RichTextNodeText();
                nodeText.setType("text");
                nodeText.setText(element.text());
                node.getChildren().add(nodeText);
            }
            // add to parent node
            nodeParent.getChildren().add(node);
        }
    }
}