只需向aplication scoped bean添加一个方法就可以了.
public void reload() {
list = dao.list();
}
然后在另一个bean中抓取/注入这个bean并调用该方法.
data.reload();
更新对不起,我忽略了“每天一次”的一点.你的意思是在后台自动重装？最好通过由ScheduledExecutorService管理的后台线程来实现.创建如下的ServletContextListener：
@WebListener
public class Config implements ServletContextListener {
private ScheduledExecutorService scheduler;
@Override
public void contextInitialized(ServletContextEvent event) {
Reloader reloader = new Reloader(event.getServletContext());
scheduler = Executors.newSingleThreadScheduledExecutor();
scheduler.scheduleAtFixedRate(reloader, 1, 1, TimeUnit.DAYS);
}
@Override
public void contextDestroyed(ServletContextEvent event) {
scheduler.shutdownNow();
}
}
类Reloader看起来像这样(假设托管bean名称是数据)
public class Reloader implements Runnable {
private ServletContext context;
public Reloader(ServletContext context) {
this.context = context;
}
@Override
public void run() {
Data data = (Data) context.getAttribute("data");
if (data != null) {
data.reload();
}
}
}