在使用条件时希望输出为json而不是数组

Question

这是我的代码，我使用投影只显示特定的列，我得到的结果为array.But我希望输出为json我该怎么做才能将输出作为{{1} }。

请帮帮我

json

我正在获得的输出

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();
        }
    }

和我期待的输出       在这里，我想只有3列说education_level_id，country_id，education_level

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

Answer 1

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