使用监听器实现Java Web的定时任务

定时器UpdateDataListener类

import java.util.TimerTask;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;


import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;


public class UpdateDataListener implements ServletContextListener
{ 

private ScheduledExecutorService service = null;

public void contextInitialized(ServletContextEvent arg0)


try {
service = Executors.newScheduledThreadPool(1);

service.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
//AutoUploadFileToFtpDays.getInstance().uploadFile();定时更新任务
}
}, 12, 120, TimeUnit.SECONDS);//12秒后执行，每隔120秒执行一次，以秒为单位。

} catch (Exception e) {
e.printStackTrace();
}
}


public void contextDestroyed(ServletContextEvent arg0)
{

if(service != null) {
service.shutdown();
}
}
}

最后在web.xml中设置监听器

<listener>  
  <listener-class>cn.data.listener.UpdateDataListener</listener-class>  
 </listener>