1.ServletContextListener servletContext监听器
它包含两个方法
(1) public void contextInitialized ( ServletContextEvent sce ); //监听到servletContext创建时调用
(2) public void contextDestroyed ( ServletContextEvent sce );//监听到servletContext销毁时调用
要实现对创建或销毁事件进行监听,只需要实现相应的方法,并在web.xml中配置即可
2.ServletContextAttributeListener servletContext属性监听器
(1)public void attributeAdded(ServletContextAttributeEvent scab); //增加属性
(2)public void attributeRemoved(ServletContextAttributeEvent scab); //移除属性
(3)public void attributeReplaced(ServletContextAttributeEvent scab); //更改属性
3.ServletRequestListener
(1)public void requestDestroyed ( ServletRequestEvent sre );
(2) public void requestInitialized ( ServletRequestEvent sre );
4.ServletRequestAttributeListener
public void attributeAdded(ServletRequestAttributeEvent srae);
public void attributeRemoved(ServletRequestAttributeEvent srae);
public void attributeReplaced(ServletRequestAttributeEvent srae);