后台时间任务的实现（JAVA版）

package cn.timer; import java.util.Calendar; import java.util.Date; import java.util.Timer; import cn.tools.Util; /**任务记录类*/ public class TaskEntry { public static final int TASK_START = 0; //定义两个表示任务记录状态常量 public static final int TASK_STOP = 1; private Long oid; //任务ID号，唯一 private String name; //任务名称 public Long getOid() { return oid; } public void setOid(Long oid) { this.oid = oid; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getState() { return state; } public void setState(int state) { this.state = state; } public Timer getTimer() { return timer; } public void setTimer(Timer timer) { this.timer = timer; } public TimePlan getTimePlan() { return timePlan; } public void setTimePlan(TimePlan timePlan) { this.timePlan = timePlan; } public AbstractTimerTask getTimerTask() { return timerTask; } public void setTimerTask(AbstractTimerTask timerTask) { this.timerTask = timerTask; } private int state = TASK_STOP; //任务状态（启动/停止） private Timer timer; //JAVA计时器 private TimePlan timePlan; //时间计划的类型 private AbstractTimerTask timerTask; //任务类的种子对象,由这个对象来不断克隆 private AbstractTimerTask runTimerTask; //运行计划的当前任务 /** * ITaskEntry.taskStart()-->TimerTask.run()-->ITaskEntry.taskStart() * 形成一个循环回路。本方法负责起动本类代表的任务 */ public void taskStart() { if (timePlan.haveNext()) { Date date = timePlan.nextDate();//得到任务计划时间 runTimerTask = timerTask.getCloneObject();//得到任务(复制) timer.schedule(runTimerTask, date); //加入计划队列 //打印将要运行的计划任务的信息 Calendar c = Calendar.getInstance(); c.setTimeInMillis(runTimerTask.scheduledExecutionTime()); System.out.println(Util.dateToLongStr(c.getTime(),"yyyy-MM-dd")+"将运行"+name); } else { state = TASK_STOP; System.out.println(name + "结束"); } } /**停止任务*/ public void taskStop() { if (runTimerTask != null) { //打印信息 Calendar c = Calendar.getInstance(); c.setTimeInMillis(runTimerTask.scheduledExecutionTime()); System.out.println("计划于:"+Util.dateToLongStr(c.getTime(),"yyyy-MM-dd")+"运行的" + name + "被终止"); //终止本任务, 调用Timer.cancel()是终止Timer的所有任务。 runTimerTask.cancel(); } else { System.out.println(name + "未进入执行计划"); } }}