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//这是我的定时器类,用来定时执行某段任务;
package com.my.time;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
public class BugXmlTimer {
public Timer timer;
public void timerStart(){
timer = new Timer();
Date datetime=new Date();
Date midnightDate=new Date();
SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd");
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
midnightDate = sdf2.parse(sdf1.format(datetime)+" 23:00:00");
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
long in=midnightDate.getTime()-datetime.getTime();
System.out.println("before task");
//立刻执行,然后每隔30s执行一次
timer.schedule(new BugXmlTimerTask(), 0,30000);
}
public void timerStop(){
if(timer!=null)
timer.cancel();
}
public static void main(String[] args){
BugXmlTimer myTimer=new BugXmlTimer();
// TODO Auto-generated method stub
myTimer.timerStart();
}
}
//这是执行任务的类,即每隔一段工夫要做的事情在这里
package com.my.time;
import java.util.TimerTask;
public class BugXmlTimerTask extends TimerTask {
@Override
public void run() {
System.out.print("run task");
}
}
//以下是动身定时操作的类,该类完成了ServletContextListener
public class MyTimerListener implements ServletContextListener {
private BugXmlTimer mytimer = new BugXmlTimer ();
public void contextInitialized(ServletContextEvent event) {
mytimer.timerStart();
}
public void contextDestroyed(ServletContextEvent event) {
mytimer.timerStop();
}
}
然后在web.xml里部署一下,即可在顺序启动后运行定时器了!
listener
listener-classcom.my.time.MyTimerListener /listener-class
/listener文章由太空记忆枕整理,收集辛苦,希望能保留出处,谢谢斑竹大哥。 |
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