JDK Timer 使用
Java 定时器之 JDK Timer：

package com.wx.jdktimer;import java.rmi.RemoteException;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.Timer;import java.util.TimerTask;import javax.ejb.CreateException;public class JDKTimerBean implements IJDKTimer {private static final long serialVersionUID = -7118631760248451136L;private Timer timer = null;private void scheduleBatchService() {timer = new Timer();TimerTask timerTask = new bizTimerTask();timer.schedule(timerTask, new Date(), 24*60*60*1000);}private void clearTimer(){Logger.getInstance().info("In method -> clearTimer now");if (timer != null) {timer.cancel();}Logger.getInstance().info("Exit method -> clearTimer now");}class bizTimerTask extends TimerTask {BizServiceds = null;@Overridepublic void run() {Logger.getInstance().info("do business logic....");System.out.println("do business logic....");ds = new BizService();ds.doBizLogic();}}public void ejbCreate() throws RemoteException, CreateException {scheduleBatchService();    }public void ejbRemove() throws RemoteException {clearTimer();}}