Listener监听器

javeee中有个8中监听器

3种分别对quest,session,context的监听

3种分别对quest,session,context增删改的监听

对session内对象的增删的监听，将session在磁盘钝化和重新加载的监听

package listen;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class ListenTest implements HttpSessionListener, ServletContextListener,
        ServletRequestListener {

    Log log = LogFactory.getLog(getClass());

    @Override
    public void requestDestroyed(ServletRequestEvent sre) {
        // TODO Auto-generated method stub
        HttpServletRequest request = (HttpServletRequest) sre
                .getServletRequest();
        long time = System.currentTimeMillis()
                - (Long) request.getAttribute("dateCreate");
        log.info(request.getRemoteAddr() + "请求处理结束,用时" + time);

    }

    @Override
    public void requestInitialized(ServletRequestEvent sre) {
        // TODO Auto-generated method stub
        HttpServletRequest request = (HttpServletRequest) sre
                .getServletRequest();
        String uri = request.getRequestURI();
        uri = request.getQueryString() == null ? uri : (uri + "?" + request
                .getQueryString());
        request.setAttribute("dateCreate", System.currentTimeMillis());
        log.info("ip" + request.getRemoteAddr() + "请求" + uri);
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        // TODO Auto-generated method stub
        ServletContext servletContext = sce.getServletContext();
        log.info("即将关闭" + servletContext.getContextPath());
    }

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        // TODO Auto-generated method stub
        ServletContext servletContext = sce.getServletContext();
        log.info("即将启动" + servletContext.getContextPath());
    }

    @Override
    public void sessionCreated(HttpSessionEvent se) {
        // TODO Auto-generated method stub
        HttpSession session = se.getSession();
        log.info("新创一个session,ID为:" + session.getId());
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent se) {
        // TODO Auto-generated method stub
        HttpSession session = se.getSession();
        log.info("销毁一个session,id为:" + session.getId());
    }

}

package listen;

import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class SessAttributeListenerTest implements HttpSessionAttributeListener {

    Log log = LogFactory.getLog(getClass());

    @Override
    public void attributeAdded(HttpSessionBindingEvent event) {
        // TODO Auto-generated method stub
        HttpSession session = event.getSession();
        String name = event.getName();
        log.info("新建session属性" + name + "值为" + event.getValue());
    }

    @Override
    public void attributeRemoved(HttpSessionBindingEvent event) {
        // TODO Auto-generated method stub
        HttpSession session = event.getSession();
        String name = event.getName();
        log.info("删除session属性" + name + "值为" + event.getValue());
    }

    @Override
    public void attributeReplaced(HttpSessionBindingEvent event) {
        // TODO Auto-generated method stub
        HttpSession session = event.getSession();
        String name = event.getName();
        log.info("修改session属性" + name + "原来值为" + event.getValue() + "现在的值为"
                + session.getAttribute(name));
    }

}