1.json格式字符串:

    String json= "{\"msg\":\"成功\",\"code\":100,\"content\":\"插入3条数据\"}";

2.java对象:

        Result result = new Result();

        result.put("msg","成功");

        result.put("code",100);

        result.put("content","插入3条数据");

        JsonObject jsonObject = JsonObject.fromObject(result);

        response.setCharacterEncoding("utf-8");//响应字符集的编码格式               response.getWriter().print(jsonObject.toString());    

3.Map:

        Map map=newHashMap();

        String json= "{\"msg\":\"成功\",\"code\":100,\"content\":"插入3条数据"}";

        map.put("json", json);

        returnjsonMap;