List<Article> al = articleMng.find(f);            System.out.println(al.size());            HttpServletResponse hsr = ServletActionContext.getResponse();            if(null == al){                return ;            }            for(Article a : al){                System.out.println(a.getId()+a.getDescription()+a.getTitle());            }            JSONArray json = new JSONArray();            for(Article a : al){                JSONObject jo = new JSONObject();                jo.put("id", a.getId());                jo.put("title", a.getTitle());                jo.put("desc", a.getDescription());                json.put(jo);            }            try {                System.out.println(json.toString());                hsr.setCharacterEncoding("UTF-8");                hsr.getWriter().write(json.toString());            } catch (IOException e) {                e.printStackTrace();            }