web应用启动加载

Question

如何在web应用（如：Tomcat）启动时就加载相应的集合？如：省份列表人。 :)
[b]问题补充：[/b]
ServletContextListener
这个监听器还没用过，我想在应用启动的时候就把所有的省份列表放在一个Session,然后在页面取。用Servlet怎么做？谢谢！
[b]问题补充：[/b]
用下面代码实现，应用启动时该Servlet没有加载，只能显示的访问
public class ContentServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    INewsCategoryService service = (INewsCategoryService) WebApplicationContextUtils
            .getWebApplicationContext(
                    request.getSession().getServletContext()).getBean(
                    "newsCategoryService");

    HttpSession session = request.getSession();
    List<NewsCategory> list = new ArrayList<NewsCategory>();
    try {
        list = service.findNumber(10);
        for (NewsCategory c : list) {
            System.out.println(c.getCategoryName());
        }
        session.setAttribute("newsCategoryList", list);
    } catch (ServiceException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

}

This is the description of my J2EE component
This is the display name of my J2EE component
ContentServlet
com.youcool.news.web.servlet.ContentServlet
1

[b]问题补充：[/b]
public void contextInitialized(ServletContextEvent arg0) {

。。。。。

}
在这个方法中如何取得Session，应用启动时没有请求！！

Answer 1

用一般的Servlet不行。照我说的做。