2）ServletContextAttributeListener:
ServletContextAttributeListener能监测到有人正在往ServletContext里添加属性。你可以采取相应的措施。
例 2.2.2.1
web.xml当中再加入一段话：
<listener>
<listener-class>com.MyServletContextAttributeListener</listener-class>
</listener>
package com;
import javax.servlet.ServletContextAttributeEvent;
import javax.servlet.ServletContextAttributeListener;
public class MyServletContextAttributeListener implements ServletContextAttributeListener {
public void attributeAdded(ServletContextAttributeEvent arg0) {
System.out.println("增加了" arg0.getName() " "
arg0.getValue() );
}
public void attributeRemoved(ServletContextAttributeEvent arg0) {
System.out.println("去除了" arg0.getName() " "
arg0.getValue() );
}
public void attributeReplaced(ServletContextAttributeEvent arg0) {
System.out.println("取代了" arg0.getName() " "
arg0.getValue() "现在的新值是" arg0.getServletContext().getAttribute(arg0.getName()) );
}
}
更多请看：https://blog.csdn.net/qq_44638460/article/details/104101837
