nutz工程里带的wkcache使用的是redis，需要先安装redis。

@IocBean
public class HomeController {
    @Inject
    private JedisAgent jedisAgent;

    @At
    @Ok("beetl:/public/site/index.html")
    public void index(HttpServletRequest req,@Param("pid") String pid)  {
        Jedis jedis= jedisAgent.getResource();
        String ticket= jedis.get("ticket");//取cache
        if(ticket==null){
            jedis.append("ticket",pid);//写入cache
            jedis.expire("ticket",2);//设置cache过期时间，单位为秒
            req.setAttribute("ticket","值"+pid+"已写入cache");
        }
        else {
         req.setAttribute("ticket","cache里的数据:"+ticket);
        }
        jedis.close();//关闭
    }
}