HttpSessionAttributeListener的用法和例項
4)HttpSessionAttributeListener:
HttpSessionAttributeListener能監測到有人正在往HttpSession裡新增屬性。你可以採取相應的措施。
例 2.2.4.1
package com;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
public class MyHttpSessionAttributeListener implements HttpSessionAttributeListener {
public void attributeAdded(HttpSessionBindingEvent arg0) {
System.out.println("增加了" + arg0.getName() + " " +
arg0.getValue() );
}
public void attributeRemoved(HttpSessionBindingEvent arg0) {
System.out.println("去除了" + arg0.getName() + " " +
arg0.getValue() );
}
public void attributeReplaced(HttpSessionBindingEvent arg0) {
System.out.println("取代了" + arg0.getName() + " " +
arg0.getValue()+"現在的新值是"+arg0.getSession().getAttribute(arg0.getName()) );
}
}
詳情請見: