显示有权限的左侧列表的步骤

1.在action里准备页面显示的数据,但因不需每次都重新准备，所以我们在listener里将数据放在application中 2.新建一个listener(initListener),继承servletconfiglistener

public class initServletContextListener implements ServletContextListener {

public void contextDestroyed(ServletContextEvent arg0) {
         
}

public void contextInitialized(ServletContextEvent arg0) {
         ServletContext application=arg0.getServletContext();
         
         ApplicationContext ac=WebApplicationContextUtils.getWebApplicationContext(application);
         PrivilegeService privilegeService=(PrivilegeService) ac.getBean(" privilegeServiceImpl");
         List<Privilege> topPrivilegeList=privilegeService.findTopList();
         application.setAttribute("topPrivilegeList", topPrivilegeList);
         
         System.out.println("-------权限的顶级对象已经准备好了--------");
         
}

}

3.在web.xml中配置listener

<listener>
<listener-class>cn.itcast.oa.listener.initServletContextListener</listener-class>
</listener>

4.在页面使用application即可