監聽器
監聽器接口
Servlet context events
ServletContextListener —— servletContext生命週期(創建或者銷燬)
ServletContextAttributeListener —— servletContext屬性變化(增刪改)HTTP session events
HttpSessionListener —— HTTP session生命週期(創建或者銷燬)
HttpSessionAttributeListener —— HTTP session屬性變化(增刪改)
HttpSessionActivationListener
HttpSessionBindingListener
HttpSessionIdListenerServlet request events
ServletRequestListener —— Servlet request生命週期(創建或者銷燬)
ServletRequestAttributeListener —— Servlet request屬性變化(增刪改)
AsyncAttributeListener
聲明方式
- 使用註解
@WebListener
- 在web.xml裏面配置
<listener>
<listener-class></listener-class>
</listener>