java定时器，在web工程中执行

import java.util.Calendar;  
import java.util.Date;  
import java.util.Timer;  
  
import javax.servlet.ServletContextEvent;  
import javax.servlet.ServletContextListener;  
  
public class SendMessageTimer implements ServletContextListener {  
  private Timer timer = null;  
  @Override  
  public void contextDestroyed(ServletContextEvent arg0) {  
    // TODO Auto-generated method stub  
    timer.cancel();   
  }  
  
  @Override  
  public void contextInitialized(ServletContextEvent arg0) {  
    //设置执行时间  
    Calendar calendar = Calendar.getInstance();  
    int year = calendar.get(Calendar.YEAR);  
    int month = calendar.get(Calendar.MONTH);  
    int day = calendar.get(Calendar.DAY_OF_MONTH);//每天  
    //定制每天的10:00:00执行，  
    calendar.set(year, month, day, 10, 00, 00);  
    Date date = calendar.getTime();  
    timer = new Timer(true);   
    System.out.println(date);  
    int period = 2 * 1000;  
    //每天的date时刻执行task，每隔2秒重复执行  
    timer.schedule(new SendMessageTask(), date, period);  
    //每天的date时刻执行task, 仅执行一次  
    //timer.schedule(task, date);  
  
  }  
}  

import java.util.TimerTask;  
  
public class SendMessageTask extends TimerTask{  
  
  @Override  
  public void run() {  
    System.out.println("执行了……");  
  }  
  
}  

   
        com.tsingsoft.basedata.sendMessage.SendMessageTimer