javax.servlet
接口 ServletContextAttributeListener

所有超级接口：

EventListener

public interface ServletContextAttributeListener
extends EventListener

Interface for receiving notification events about ServletContext attribute changes.

In order to receive these notification events, the implementation class must be either declared in the deployment descriptor of the web application, annotated with WebListener, or registered via one of the addListener methods defined on ServletContext.

The order in which implementations of this interface are invoked is unspecified.

从以下版本开始：

Servlet 2.3

另请参见：

ServletContextAttributeEvent

方法摘要

void	attributeAdded(ServletContextAttributeEvent event) Receives notification that an attribute has been added to the ServletContext.
void	attributeRemoved(ServletContextAttributeEvent event) Receives notification that an attribute has been removed from the ServletContext.
void	attributeReplaced(ServletContextAttributeEvent event)

方法详细信息

attributeAdded

void attributeAdded(ServletContextAttributeEvent event)

Receives notification that an attribute has been added to the ServletContext.

参数：

event - the ServletContextAttributeEvent containing the ServletContext to which the attribute was added, along with the attribute name and value

attributeRemoved

void attributeRemoved(ServletContextAttributeEvent event)

Receives notification that an attribute has been removed from the ServletContext.

参数：

event - the ServletContextAttributeEvent containing the ServletContext from which the attribute was removed, along with the attribute name and value

attributeReplaced

void attributeReplaced(ServletContextAttributeEvent event)