怎么在监听器里写一个初始化session

想实现一个功能，tomcat初始化时，自动把网站信息保存监听器的session里，供其他页面调取。或者各位大师有没有更好的方法？

copy的项目里的，稍微改了下不相关的，以下，仅供参考吧

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

public class InitListener implements ServletContextListener, HttpSessionListener {

    private static ApplicationContext ctx = null;
    private static HttpSession session = null;

    public InitListener() {}

    public void sessionCreated(HttpSessionEvent httpSessionEvent) {
        session = httpSessionEvent.getSession();
        session.setAttribute("", ""); // init something...
    }

    public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {}

    public static HttpSession getSession() {
        return session;
    }

    public void contextInitialized(ServletContextEvent evt) {
        ctx = WebApplicationContextUtils.getWebApplicationContext(evt.getServletContext());
    }

    public void contextDestroyed(ServletContextEvent paramServletContextEvent) {}

    public static ApplicationContext getCtx() {
        return ctx;
    }
}

记得在web.xml里边添加一个监听：

<listener>
    <description>系统初始化监听器</description>
    <listener-class>com.xxx.xxxx.InitListener</listener-class>
</listener>