在java中展平3层嵌套的JSON字符串

<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20210307</version>
</dependency>

import org.json.JSONArray;
import org.json.JSONObject;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class JsonFlattener {

    public static void main(String[] args) {
        String nestedJson = "{\n" +
                "  \"a\": {\n" +
                "    \"b\": {\n" +
                "      \"c\": \"value\"\n" +
                "    }\n" +
                "  }\n" +
                "}";

        Map<String, Object> flattenedMap = flattenJson(new JSONObject(nestedJson), "");

        for (Map.Entry<String, Object> entry : flattenedMap.entrySet()) {
            System.out.println(entry.getKey() + ": " + entry.getValue());
        }
    }

    private static Map<String, Object> flattenJson(JSONObject jsonObject, String prefix) {
        Map<String, Object> result = new HashMap<>();

        Iterator<String> keys = jsonObject.keys();
        while (keys.hasNext()) {
            String key = keys.next();
            Object value = jsonObject.get(key);
            String newPrefix = prefix.isEmpty() ? key : prefix + "." + key;

            if (value instanceof JSONObject) {
                result.putAll(flattenJson((JSONObject) value, newPrefix));
            } else if (value instanceof JSONArray) {
                JSONArray jsonArray = (JSONArray) value;
                for (int i = 0; i < jsonArray.length(); i++) {
                    Object arrayItem = jsonArray.get(i);
                    if (arrayItem instanceof JSONObject) {
                        result.putAll(flattenJson((JSONObject) arrayItem, newPrefix + "[" + i + "]"));
                    } else {
                        result.put(newPrefix + "[" + i + "]", arrayItem);
                    }
                }
            } else {
                result.put(newPrefix, value);
            }
        }

        return result;
    }
}