禁止浏览器缓存的过滤器问题

刚入门，写了一个禁止浏览器缓存的过滤器
以下是代码：

 public void doFilter(ServletRequest req, ServletResponse resp,
            FilterChain chain) throws IOException, ServletException {

        HttpServletRequest request=(HttpServletRequest) req;
        HttpServletResponse response=(HttpServletResponse) resp;

        response.setDateHeader("Expires", -1);
        response.setHeader("Cache-Control", "no-cache");
        response.setHeader("Pragma", "no-cache");

        chain.doFilter(request, response);

    }

 <filter>
        <filter-name>NoCacheFilter</filter-name>
        <filter-class>cn.my.web.filter.NoCacheFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>NoCacheFilter</filter-name>
        <url-pattern>*.jsp</url-pattern>
    </filter-mapping>

但是过滤器没反应，求解。代码测过访问jsp时有进入过滤器，但是依旧有缓存，是我写错了么?

http://blog.csdn.net/dyc9891009/article/details/8084271