如何将JSONObject收藏保存到文件或从文件加载？

   public static void main(String[] args) {

       JSONObject jsonObject = new JSONObject();

       jsonObject.put("key1", "value1");

       jsonObject.put("key2", "value2");

       String jsonString = jsonObject.toString();

       try (BufferedWriter writer = new BufferedWriter(new FileWriter("data.json"))) {

           writer.write(jsonString);

       } catch (IOException e) {

           e.printStackTrace();

       }

   }

   public static void main(String[] args) {

       try (BufferedReader reader = new BufferedReader(new FileReader("data.json"))) {

           StringBuilder jsonString = new StringBuilder();

           String line;

           while ((line = reader.readLine()) != null) {

               jsonString.append(line);

           }

           JSONObject jsonObject = new JSONObject(jsonString.toString());

           System.out.println(jsonObject);

       } catch (IOException e) {

           e.printStackTrace();

       }

   }