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--------------------------------
Application的Event事件
|
--------------------------------
#
Spring
的核心是
ApplicationContext
,
它负责管理
beans
的完整生命周期
#
当加载
beans
时
,
ApplicationContext
发布某些类型的事件
*
当上下文启动时
,
ContextStartedEvent
发布
*
当上下文停止时
,
ContextStoppedEvent
发布
#
通过
ApplicationEvent
类和
ApplicationListener
接口来提供在
ApplicationContext
中处理事件
#
如果一个
bean
实现
ApplicationListener
,
那么每次
ApplicationEvent
被发布到
ApplicationContext
上
,
那个
bean
会被通知
#
Spring
提供了以下的标准事件
1
,
ContextRefreshedEvent
*
ApplicationContext
被初始化或刷新时
,
该事件被发布
*
这也可以在
ConfigurableApplicationContext
接口中使用
refresh
()
方法来发生
2
,
ContextStartedEvent
*
当使用
ConfigurableApplicationContext
接口中的
start
()
方法启动
ApplicationContext
时
,
该事件被发布
*
你可以调查你的数据库
,
或者你可以在接受到这个事件后重启任何停止的应用程序
3
,
ContextStoppedEvent
*
当使用
ConfigurableApplicationContext
接口中的
stop
()
方法停止
ApplicationContext
时
,
发布这个事件
*
你可以在接受到这个事件后做必要的清理的工作
4
,
ContextClosedEvent
*
当使用
ConfigurableApplicationContext
接口中的
close
()
方法关闭
ApplicationContext
时
,
该事件被发布
*
一个已关闭的上下文到达生命周期末端
;
它不能被刷新或重启
5
,
RequestHandledEvent
*
这是一个
web
-
specific
事件
,
告诉所有
bean
HTTP
请求已经被服务
#
步骤
1
,
自定义类实现
ApplicationListener
<
E
extends
ApplicationEvent
>
2
,
根据泛型
:
ApplicationEvent来决定要监听的事件
3
,
把该类加入IOC
#
Demo
public
class
CStartEventHandler
implements
ApplicationListener
<
ContextStartedEvent
>{
public
void
onApplicationEvent
(
ContextStartedEvent
event
) {
System
.
out
.
println
(
"ContextStartedEvent Received"
);
}
}
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