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