HttpSessionAttributeListener

HttpSessionAttributeListener

监听已登录用户

当进行session操作时，如下：就会调用本监听

session.setAttribute("username","tom");

session.removeAttribute("username");

 

 

 

import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;

import com.stephen.utility.DateTool;

@WebListener
public class MyHttpSessionAttributeListener implements HttpSessionAttributeListener {

	@Override
	public void attributeAdded(HttpSessionBindingEvent event) {
		System.out.println(DateTool.date2String()+"->[MyHttpSessionAttributeListener]"+event.getName()+"="+event.getValue()+" attributeAdded");
	}

	@Override
	public void attributeRemoved(HttpSessionBindingEvent event) {
		System.out.println(DateTool.date2String()+"->[MyHttpSessionAttributeListener]"+event.getName()+"="+event.getValue()+" attributeRemoved");
	}

	@Override
	public void attributeReplaced(HttpSessionBindingEvent event) {
		System.out.println(DateTool.date2String()+"->[MyHttpSessionAttributeListener]"+event.getName()+"="+event.getValue()+" attributeReplaced");
	}

}

 

 

 

    package com.nbrc.lddw.util;  
      
    import javax.servlet.http.HttpSession;  
    import javax.servlet.http.HttpSessionAttributeListener;  
    import javax.servlet.http.HttpSessionBindingEvent;  
    import javax.servlet.http.HttpSessionBindingListener;  
      
    import org.apache.commons.logging.Log;  
    import org.apache.commons.logging.LogFactory;  
    import org.springframework.context.ApplicationContext;  
    import org.springframework.web.context.support.WebApplicationContextUtils;  
      
    import com.nbrc.lddw.interceptor.AuthorizeInterceptor;  
    import com.nbrc.lddw.model.OnlineInfo;  
    import com.nbrc.lddw.model.User;  
    import com.nbrc.lddw.service.OnlineUserService;  
    /** 
     *  
     * @author fox 
     * @date 2009-02-09 
     * @description 已登录用户的监听 
     */  
    public class OnlineUserListener implements HttpSessionAttributeListener {  
        private static Log log = LogFactory.getLog(OnlineUserListener.class);  
      
        public void attributeAdded(HttpSessionBindingEvent hse) {  
            log.info("value bound! make session info ...");  
            HttpSession session = hse.getSession();       
            ApplicationContext context =   
                WebApplicationContextUtils.getRequiredWebApplicationContext(session.getServletContext());  
            OnlineUserService svr = (OnlineUserService)context.getBean("onlineService");  
            User u = null;  
            if(session.getAttribute(AuthorizeInterceptor.USR_KEY)!=null)  
                u = (User) session.getAttribute(AuthorizeInterceptor.USR_KEY);  
            if(u!=null && svr.findByUserId(u.getId())==null){             
                    OnlineInfo info = new OnlineInfo();  
                    info.setSessionId(session.getId());  
                    info.setUserId(u.getId());  
                    svr.save(info);  
            }else{  
                    log.error("can't get user in session");  
            }         
        }  
      
        public void attributeRemoved(HttpSessionBindingEvent hse) {  
            HttpSession session = hse.getSession();  
            ApplicationContext context = WebApplicationContextUtils.getRequiredWebApplicationContext(session.getServletContext());  
            OnlineUserService svr = (OnlineUserService)context.getBean("onlineService");  
            if(svr.findById(session.getId())!=null){  
                svr.removeById(session.getId());                  
            }  
        }  
      
        public void attributeReplaced(HttpSessionBindingEvent se) {  
            // TODO Auto-generated method stub  
              
        }  
          
      
    }