JAVA JSONObject 多层级多json合并

业务场景:
多个结构一致的json字符串，需要合并成一个jsonObject,相当于取两个json的并集。

例如：
JSONObject1=
{"aaa":"1","bbb":{"test":"test"}}
JSONObject2=
{"aaa":"2","bbb":{"test2":"test2"}}

JSONObject jt = jsonMerge(jsonObject,jsonObject1);
jt={"aaa":"1","bbb":{"test2":"test2","test":"test"}}

可见，bbb中，包含test和test2

public static JSONObject jsonMerge(JSONObject source, JSONObject target) {
    // 覆盖目标JSON为空，直接返回覆盖源
    if (target == null) {
        return source;
    }

    for (String key : source.keySet()) {
        Object value = source.get(key);
        if (!target.containsKey(key)) {
            target.put(key, value);
        } else {
            if (value instanceof JSONObject) {
                JSONObject valueJson = (JSONObject) value;
                JSONObject targetValue = jsonMerge(valueJson, target.getJSONObject(key));
                target.put(key, targetValue);
            } else if (value instanceof JSONArray) {
                JSONArray valueArray = (JSONArray) value;
                for (int i = 0; i < valueArray.size(); i++) {
                    JSONObject obj = (JSONObject) valueArray.get(i);
                    JSONObject targetValue = jsonMerge(obj, (JSONObject) target.getJSONArray(key).get(i));
                    target.getJSONArray(key).set(i, targetValue);
                }
            } else {
                target.put(key, value);
            }
        }
    }
    return target;
}