在使用条件时希望输出为 json 而不是数组

Question

这是我的代码，我正在使用投影来仅显示特定列，并且我将结果作为数组获取。但我希望输出为 json 我该怎么做才能将输出作为 json。

请帮帮我

public List<Educationlevel> getAllEducationlevel() {
        Session session = SessionFactoryUtil.getSessionFactory().openSession();
        try {
            session.beginTransaction();
            Criteria criteria = session.createCriteria(Educationlevel.class);
            ProjectionList projlist =Projections.projectionList();
            projlist.add(Projections.property("education_level"));
            projlist.add(Projections.property("education_level_id"));
            projlist.add(Projections.property("country_id"));
            criteria.add(Restrictions.eq("delete_flag", false));
            criteria.setProjection(projlist);
            return criteria.list();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        } finally {
            session.getTransaction().commit();
            session.close();
        }
    }

我得到的输出

[["PG",0,2],["PHD",1,2]]

以及我期望的输出 在这个我只想要 3 列说education_level_id,country_id,education_level

{
    education_level_id: 0
    country_id: 2
    education_level: "PG"
    delete_flag: false
    insert_by: null
    insert_date: "2015-10-19 12:49:52.0"
    update_by: null
    update_date: "2015-10-19 12:49:52.0"
}

Answer 1

JSONObject jo = new JSONObject();    
jo.put("education_level", "PG");    
jo.put("education_level_id", "0");    
JSONArray ja = new JSONArray();    
ja.put(jo);