JSON可用

getResponse().setContentType("text/json;charset=UTF-8");
        getResponse().setCharacterEncoding("UTF-8");
        try
        {
            /* 获取writer对象 */
            PrintWriter writer = getResponse().getWriter();
            /* 将结果写回客户端 */
            writer.write(result);
            writer.flush();
            writer.close();
        }