【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");
    }
}