【JavaEE企业应用实战学习记录】requestListener

 package sanglp.servlet;

 import javax.servlet.*;
 import javax.servlet.annotation.WebListener;
 import javax.servlet.http.HttpServletRequest;

 /**
  * Created by Administrator on 2016/10/5.
  */
 @WebListener
 public class RequestListener implements ServletRequestListener,ServletRequestAttributeListener {

     //用户请求到底，被初始化时触发该方法
     @Override
     public void requestInitialized(ServletRequestEvent servletRequestEvent) {
         HttpServletRequest request=(HttpServletRequest)servletRequestEvent.getServletRequest();
         System.out.println("发向"+request.getRequestURI()+"请求被初始化");
     }
     //用户请求到底，被销毁时触发该方法
     @Override
     public void requestDestroyed(ServletRequestEvent servletRequestEvent) {
         HttpServletRequest request=(HttpServletRequest)servletRequestEvent.getServletRequest();
         System.out.println("发向"+request.getRequestURI()+"请求被销毁");

     }

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

     }

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

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