将json对象数组转换为json文件

Question

这是json文件。

{
  "data": [
    {
      "name": "kasun",
      "position": "Software Engineer",
      "salary": "10000",
      "start_date": "2015/08/10",
      "office": "ABC",
      "extn": "100"
    } ,
    {
      "name": "Amal",
      "position": "System Architect",
      "salary": "10000",
      "start_date": "2015/08/10",
      "office": "DEF",
      "extn": "100"
    }     
  ]
}
}

在我的项目中，我必须通过servlet文件获取此json文件。 现在我已经实现了它。

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException, ParseException {
        HttpSession session = request.getSession();
        String filePath = "D:\\yakaari\\EPIC_PROJECTS\\2015\\IBWEB\\IBWeb\\web\\datagrid.json";
        try {
            FileReader reader = new FileReader(filePath);
            JSONParser jsonParser = new JSONParser();
            JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);
            JSONArray jsonarray = (JSONArray) jsonObject.get("data");
            session.setAttribute("jsonarray", jsonarray);

            for (int i = 0; i < jsonarray.size(); i++) {
                System.out.println("The " + i + " element of the array: " + jsonarray.get(i));
            }
        } catch (FileNotFoundException ex) {
            ex.printStackTrace();
        } catch (IOException ex) {
            ex.printStackTrace();
        } catch (ParseException ex) {
            ex.printStackTrace();
        } catch (NullPointerException ex) {
            ex.printStackTrace();
        }
        RequestDispatcher rd = request.getRequestDispatcher("/WEB-INF/customer/customergrid.jsp");/*redirect to the login page*/

        rd.include(request, response);
    }

现在问题是我想将这个json对象数组再次转换为json文件，因为我需要ajax函数的json文件类型变量。

这是ajax功能。

<script type="text/javascript">
            $(document).ready(function() {
                $('#example').dataTable({
                    "ajax": "datagrid.json",

                    "columns": [
                        {"data": "name"},
                        {"data": "position"},
                        {"data": "office"},
                        {"data": "extn"},
                        {"data": "start_date"},
                        {"data": "salary"}
                    ]
                    ,
                    responsive: true
                });
            });
        </script>

是可以做到还是有其他办法？感谢