標籤:
java代碼:
public class InitListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent sce) {
// 擷取容器與相關的Service對象
ApplicationContext ac = WebApplicationContextUtils.getWebApplicationContext(sce.getServletContext());
PrivilegeService privilegeService = (PrivilegeService) ac.getBean("privilegeServiceImpl");
// 準備資料:topPrivilegeList
List<Privilege> topPrivilegeList = privilegeService.findTopList();
sce.getServletContext().setAttribute("topPrivilegeList", topPrivilegeList);
System.out.println("------------> 已準備資料topPrivilegeList <------------");
// 準備資料:allPrivilegeUrls
Collection<String> allPrivilegeUrls = privilegeService.getAllPrivilegeUrls();
sce.getServletContext().setAttribute("allPrivilegeUrls", allPrivilegeUrls);
System.out.println("------------> 已準備資料allPrivilegeUrls <------------");
}
public void contextDestroyed(ServletContextEvent arg0) {
}
}
web.xml中的配置如下:
<!-- 配置Spring的用於初始化容器物件的監聽器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext*.xml</param-value>
</context-param>
<!--
用於做初始化工作的監聽器,一定要配置到Spring的ContextLoaderListener之後,因為要用到Spring的容器物件
-->
<listener>
<listener-class>cn.util.InitListener</listener-class>
</listener>
在jsp中擷取資料:
<s:iterator value="#application.topPrivilegeList">
Springzz中使用監聽器,用於容器一啟動就載入準備資料(application範圍內的資料,用於減輕伺服器壓力,不用每次都去查資料)