如何删除JsonNode中的空节点

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonNodeUtils {
    private static final ObjectMapper objectMapper = new ObjectMapper();

    public static JsonNode removeEmptyNodes(JsonNode node) {
        if (node.isObject()) {
            node.fields().forEachRemaining(entry -> {
                JsonNode childNode = entry.getValue();
                if (childNode.isNull()) {
                    ((ObjectNode) node).remove(entry.getKey());
                } else {
                    removeEmptyNodes(childNode);
                }
            });
        } else if (node.isArray()) {
            for (int i = 0; i < node.size(); i++) {
                JsonNode childNode = node.get(i);
                if (childNode.isNull()) {
                    ((ArrayNode) node).remove(i);
                    i--; // Adjust the index after removing the node
                } else {
                    removeEmptyNodes(childNode);
                }
            }
        }
        return node;
    }

    public static void main(String[] args) throws Exception {
        String jsonString = "{\"name\":\"John\",\"age\":30,\"address\":null,\"hobbies\":[\"reading\",null,\"swimming\"]}";
        JsonNode jsonNode = objectMapper.readTree(jsonString);

        System.out.println("Before removing empty nodes:");
        System.out.println(jsonNode.toPrettyString());

        JsonNode result = removeEmptyNodes(jsonNode);

        System.out.println("After removing empty nodes:");
        System.out.println(result.toPrettyString());
    }
}