【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");

    }
}