public class MyServletContextListener implements ServletContextListener {
    public void contextInitialized(ServletContextEvent event) {
        // ServletContext創(chuàng)建時(shí)執(zhí)行的代碼
    }
    public void contextDestroyed(ServletContextEvent event) {
        // ServletContext銷(xiāo)毀時(shí)執(zhí)行的代碼
    }
}

public interface MyEventListener {
    void onEvent(Event event);
}
public class EventSource {
    private MyEventListener listener;
    public void setEventListener(MyEventListener listener) {
        this.listener = listener;
    }
    public void fireEvent(Event event) {
        if (listener != null) {
            listener.onEvent(event);
        }
    }
}
public class MyEventListenerImpl implements MyEventListener {
    public void onEvent(Event event) {
        // 處理事件的代碼
    }
}

public class MyHttpSessionAttributeListener implements HttpSessionAttributeListener {
    public void attributeAdded(HttpSessionBindingEvent event) {
        // HttpSession中添加屬性時(shí)執(zhí)行的代碼
    }
    public void attributeRemoved(HttpSessionBindingEvent event) {
        // HttpSession中刪除屬性時(shí)執(zhí)行的代碼
    }
    public void attributeReplaced(HttpSessionBindingEvent event) {
        // HttpSession中替換屬性時(shí)執(zhí)行的代碼
    }
}

public class MyServletContextListener implements ServletContextListener {
    public void contextInitialized(ServletContextEvent event) {
        // ServletContext創(chuàng)建時(shí)執(zhí)行的代碼
    }
    public void contextDestroyed(ServletContextEvent event) {
        // ServletContext銷(xiāo)毀時(shí)執(zhí)行的代碼
    }
}
public class MyHttpSessionListener implements HttpSessionListener {
    public void sessionCreated(HttpSessionEvent event) {
        // HttpSession創(chuàng)建時(shí)執(zhí)行的代碼
    }
    public void sessionDestroyed(HttpSessionEvent event) {
        // HttpSession銷(xiāo)毀時(shí)執(zhí)行的代碼
    }
}
public class MyServletRequestListener implements ServletRequestListener {
    public void requestInitialized(ServletRequestEvent event) {
        // ServletRequest創(chuàng)建時(shí)執(zhí)行的代碼
    }
    public void requestDestroyed(ServletRequestEvent event) {
        // ServletRequest銷(xiāo)毀時(shí)執(zhí)行的代碼
    }
}

public class MyServletContextAttributeListener implements ServletContextAttributeListener {
    public void attributeAdded(ServletContextAttributeEvent event) {
        // ServletContext中添加屬性時(shí)執(zhí)行的代碼
    }
    public void attributeRemoved(ServletContextAttributeEvent event) {
        // ServletContext中刪除屬性時(shí)執(zhí)行的代碼
    }
    public void attributeReplaced(ServletContextAttributeEvent event) {
        // ServletContext中替換屬性時(shí)執(zhí)行的代碼
    }
}
public class MyHttpSessionAttributeListener implements HttpSessionAttributeListener {
    public void attributeAdded(HttpSessionBindingEvent event) {
        // HttpSession中添加屬性時(shí)執(zhí)行的代碼
    }
    public void attributeRemoved(HttpSessionBindingEvent event) {
        // HttpSession中刪除屬性時(shí)執(zhí)行的代碼
    }
    public void attributeReplaced(HttpSessionBindingEvent event) {
        // HttpSession中替換屬性時(shí)執(zhí)行的代碼
    }
}
public class MyServletRequestAttributeListener implements ServletRequestAttributeListener {
    public void attributeAdded(ServletRequestAttributeEvent event) {
        // ServletRequest中添加屬性時(shí)執(zhí)行的代碼
    }
    public void attributeRemoved(ServletRequestAttributeEvent event) {
        // ServletRequest中刪除屬性時(shí)執(zhí)行的代碼
    }
    public void attributeReplaced(ServletRequestAttributeEvent event) {
        // ServletRequest中替換屬性時(shí)執(zhí)行的代碼
    }
}

public class MySessionBindingListener implements HttpSessionBindingListener {
    public void valueBound(HttpSessionBindingEvent event) {
        // HttpSession中存值時(shí)執(zhí)行的代碼
    }
    public void valueUnbound(HttpSessionBindingEvent event) {
        // HttpSession中刪除值時(shí)執(zhí)行的代碼
    }
}