<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
……
</bean>
当tomcat关闭的时候会自动调用contextDestroyed(ServletContextEvent event)这个方法,
AbstractApplicationContext.Close这个方法是要你自己调用的，在程序要结束的时候保证调用这个close方法，在这里的话就是由Listener来保证tomcat退出的时候调用close方法
其实就是调用context里面的beanFactory的destroySingletons()方法了
这个消息是要靠外部（程序员）来提供的
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