【JavaEE企业应用实战学习记录】MyGetAttributeListener

 package sanglp.servlet;

 import javax.servlet.ServletContext;
 import javax.servlet.ServletContextAttributeEvent;
 import javax.servlet.ServletContextAttributeListener;
 import javax.servlet.annotation.WebListener;

 /**
  * Created by Administrator on 2016/10/5.
  * 监听ServletContext范围内属性改变的Listener
  */
 @WebListener
 public class MyServletContextAttributeListener implements ServletContextAttributeListener {

     @Override
     public void attributeAdded(ServletContextAttributeEvent servletContextAttributeEvent) {
         ServletContext application=servletContextAttributeEvent.getServletContext();
         //获取添加的属性名和属性值
         String name=servletContextAttributeEvent.getName();
         Object value=servletContextAttributeEvent.getValue();
         System.out.println(application+"范围内添加了"+name+"值为"+value+"的属性");

     }

     @Override
     public void attributeRemoved(ServletContextAttributeEvent servletContextAttributeEvent) {
         ServletContext application=servletContextAttributeEvent.getServletContext();
         //获取添加的属性名和属性值
         String name=servletContextAttributeEvent.getName();
         Object value=servletContextAttributeEvent.getValue();
         System.out.println(application+"范围内删除了"+name+"值为"+value+"的属性");
     }

     @Override
     public void attributeReplaced(ServletContextAttributeEvent servletContextAttributeEvent) {
         ServletContext application=servletContextAttributeEvent.getServletContext();
         //获取添加的属性名和属性值
         String name=servletContextAttributeEvent.getName();
         Object value=servletContextAttributeEvent.getValue();
         System.out.println(application+"范围内替换了"+name+"值为"+value+"的属性");

     }
 }