如何在Java中获得JSON格式的文件目录结构？

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

import java.io.File;
import java.io.IOException;

public class JsonDirectoryStructure {
    public static void main(String[] args) {
        String directoryPath = "path/to/directory";
        File directory = new File(directoryPath);

        ObjectMapper mapper = new ObjectMapper();
        ObjectNode rootNode = mapper.createObjectNode();

        processDirectory(directory, rootNode);

        try {
            String json = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(rootNode);
            System.out.println(json);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void processDirectory(File directory, ObjectNode parentNode) {
        ArrayNode childrenNode = parentNode.putArray("children");

        for (File file : directory.listFiles()) {
            ObjectNode childNode = childrenNode.addObject();
            childNode.put("name", file.getName());

            if (file.isDirectory()) {
                childNode.put("type", "directory");
                processDirectory(file, childNode);
            } else {
                childNode.put("type", "file");
            }
        }
    }
}