ServletContextAttributeListener的用法和例項
2)ServletContextAttributeListener:
ServletContextAttributeListener能監測到有人正在往ServletContext裡新增屬性。你可以採取相應的措施。
例 2.2.2.1
web.xml當中再加入一段話:
<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() + " " +