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自定义session扫描器精确控制session销毁时间--学习笔记

时间:2018-04-20 15:58:07      阅读:210      评论:0      收藏:0      [点我收藏+]
package cn.xijie.listener; import java.util.ArrayList; import java.util.Collections; import java.util.Date; import java.util.List; import java.util.ListIterator; import java.util.Timer; import java.util.TimerTask; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import javax.servlet.http.HttpSession; import javax.servlet.http.HttpSessionEvent; import javax.servlet.http.HttpSessionListener; //HttpSession扫描器 public class SessionScanner implements ServletContextListener,HttpSessionListener{ private List<HttpSession> sessionList = new ArrayList<HttpSession>(); //线程安全 private Timer timer = new Timer(); public SessionScanner(){ //将线程不安全的List转换成线程安全的List sessionList = Collections.synchronizedList(sessionList); } //ServletContext产生 public void contextInitialized(ServletContextEvent sce) { timer.schedule(new SessionTask(this.sessionList),0,1*1000); } //HttpSession产生 public void sessionCreated(HttpSessionEvent se) { //取得客户端产生的HttpSession HttpSession session = se.getSession(); System.out.println("HttpSession产生" + session.hashCode() + new Date().toLocaleString()); synchronized (sessionList) { //将HttpSession加入到容器中 this.sessionList.add(session); } } //ServletContext销毁 public void contextDestroyed(ServletContextEvent sce) { timer.cancel(); } //HttpSession销毁 public void sessionDestroyed(HttpSessionEvent se) { HttpSession session = se.getSession(); System.out.println("HttpSession销毁" + session.hashCode() + new Date().toLocaleString()); } } //任务类 class SessionTask extends TimerTask{ private List<HttpSession> sessionList; public SessionTask(List<HttpSession> sessionList) { this.sessionList = sessionList; } public void run() { System.out.println("run()"); //迭代集合 //Iterator<HttpSession> it = sessionList.iterator(); synchronized (sessionList) { ListIterator<HttpSession> it = sessionList.listIterator(); while (it.hasNext()) { HttpSession session = it.next(); //判段HttpSession是否1分钟未被使用 int middle = (int) ((System.currentTimeMillis() - session .getLastAccessedTime()) / 1000); if (middle > 60) { //将该HttpSession销毁 session.invalidate(); //从集合中删除该HttpSession ....有可能出现并发问题 //sessionList.remove(session); it.remove(); } } } } }

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HttpSession产生6027721002018-4-20 14:47:32
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HttpSession销毁6027721002018-4-20 14:48:45
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自定义session扫描器精确控制session销毁时间--学习笔记

原文:http://blog.51cto.com/357712148/2105761

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