1 package sanglp.servlet; 2  3 import javax.servlet.ServletContext; 4 import javax.servlet.ServletContextAttributeEvent; 5 import javax.servlet.ServletContextAttributeListener; 6 import javax.servlet.annotation.WebListener; 7  8 /** 9  * Created by Administrator on 2016/10/5.10  * 监听ServletContext范围内属性改变的Listener11  */12 @WebListener13 public class MyServletContextAttributeListener implements ServletContextAttributeListener {14 15     @Override16     public void attributeAdded(ServletContextAttributeEvent servletContextAttributeEvent) {17         ServletContext application=servletContextAttributeEvent.getServletContext();18         //获取添加的属性名和属性值19         String name=servletContextAttributeEvent.getName();20         Object value=http://www.mamicode.com/servletContextAttributeEvent.getValue();21         System.out.println(application+"范围内添加了"+name+"值为"+value+"的属性");22 23 24     }25 26     @Override27     public void attributeRemoved(ServletContextAttributeEvent servletContextAttributeEvent) {28         ServletContext application=servletContextAttributeEvent.getServletContext();29         //获取添加的属性名和属性值30         String name=servletContextAttributeEvent.getName();31         Object value=http://www.mamicode.com/servletContextAttributeEvent.getValue();32         System.out.println(application+"范围内删除了"+name+"值为"+value+"的属性");33     }34 35 36     @Override37     public void attributeReplaced(ServletContextAttributeEvent servletContextAttributeEvent) {38         ServletContext application=servletContextAttributeEvent.getServletContext();39         //获取添加的属性名和属性值40         String name=servletContextAttributeEvent.getName();41         Object value=http://www.mamicode.com/servletContextAttributeEvent.getValue();42         System.out.println(application+"范围内替换了"+name+"值为"+value+"的属性");43 44     }45 }