A.ServletContextListener監(jiān)聽器的contextDestroyed()方法
	B.HttpSessionListener監(jiān)聽器的sessionDestroyed()方法
	C.ServletContextAttributeListener監(jiān)聽器的attributeRemoved()方法
	D.HttpSessionAttributeListener監(jiān)聽器的attributeRemoved()方法
 
                            
	A.Action
	B.ActionMapping
	C.ActionServlet
	D.Request
