监听器

笔记:

监听三个域对象的属性变更的监听器

王类监听器

ServletContextAttributeListener

监听ServletContext对象中的属性变更(属性添加、移除、替换)的监听

attributeAdded (ServletContextAttributeEvent event)

attributeRemoved (ServletContextAttributeEvent event)

attributeReplaced (ServletContextAttributeEvent event)

HttpSessionAttributeListener

监听HttpSession对象中的属性变更(属性添加、移除、替换)的监听器

attributeAdded (HttpSessionBindingEvent event)

attributeRemoved (Ht tpSessionBindingEvent event)

attributeReplaced (Ht tpSessionBindingEvent event)

ServletRequestAttributeListener

监听ServletRequest对象中的属性变更(属性添加、移除、替换)的监听

attr ibuteAdded (ServletRequestAttributeEvent srae)

attributeRemoved (ServletRequestAttributeEvent srae)

attributeReplaced (ServletRequestAttributeEvent srae)


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