定时任务3

定时任务3 java??Ê?ÈÎÎñ??Àí???? Java2µÄ?ª???üÖÐÌá??ÁËÒ?ÖÖºÜÊ?ÓõÄÏß?Ì??ÄÜ?ºÌáÇ???ÅÅ??À?Ä??ÎÊ??äÖ?ÐÐÄ?ÈÎÎñTimer ??TimerTask??Äã?ÉÒÔÊ?ÓÃÕâÐ?Àà????ºóÌ??ø?Ì??ÈÃÆäÔÚµÈ?ýÒ??Î?æ??µÄÊ??äºóÖ?ÐÐ???òÕßÈÃÆäÃ??ôÒ??ÎÊ??äÖ?ÐÐ??ÄãÒ??ÉÒÔÓÃThreadÀ?Íê?É??µ?ÀûÓÃTimerÓëTimerTaskÏÔÈ?Ê?ÊÂ??ÉÙ?? TimerTaskʵÏÖÁËRunnable?Ó?Ú???ýÖ?ÐеÄÈÎÎñÖÃÓÚrun()ÖÐ??TimerÊÇÒ??ö??ÅÅTimerTaskµÄÀà?Ë?ËÁ?ÕßÒ??ãÒ?Æð??×???ËùÓ?ÓÃÊ?Ê×ÏÈÓ?????Ò??öTimerTaskµÄ?ÔÏó??È?ºóÓÃÒ??öTimerµÄÀà?ÔÏó??ÅÅÖ?ÐÐËü TimerÀà?üº?µÄ????ÓÐ?º 1.Timer() ÒÔ???æ??Ê?ÔËÐÐtask 2.Timer(boolean) trueÊ?Ê?ÓúóÌ??ø?ÌÏß?Ì??Ö?ÒªÊ?ϵÄ?ÌÐò?ÇÐðÔËÐÐ??ºóÌ??ø?ÌÏß?Ì?Í?áÖ?ÐÐ?? 3.public void cancel() ÖÕÖ?TimerµÄ??ÄÜÖ?ÐÐ??µ????á?ÔÕýÔÚÖ?ÐеÄÈÎÎñÓÐÓ?Ïì??µ?Ö?ÐÐcancel????ºó????ÄÜÔÙÓÃÆä?ÖÅäÈÎÎñ?? 4.public void schedule(TimerTask task,Date time) task????ÅÅÔÚtimeÖ???µÄÊ??äÖ?ÐÐ??Èç?ûÊ??äΪ?ýÈ?Ê?ÔòÈÎÎñÁ??ÌÖ?ÐÐ?? 5.public void schedule(TimerTask task, Date firstTime, long period) task????ÅÅÔÚtimeÖ???µÄÊ??äÖ?ÐÐ??Ö?Ðкó??Ã??ôperiod(ºÁÃë)????Ö?ÐÐ??ÓÉÓÚ?æ??µÄÊ??ä?ä?ô????ÄÜ??Ö?ÓëÊ?ÖÓ??×?µÄÍ???????ËùÒÔ?Ã?? ??×îÊʺÏ?Ó?ÌÆÚ?????ÖƵÂÊ×?È?ÊÇ?üÖØÒªµÄµÄµØ?? 6.public void schedule(TimerTask task, long delay) task????ÅÅÔÚdelay??ºÁÃë??Ö???µÄÊ??äºóÖ?ÐÐ?? 7.public void schedule(TimerTask task,long delay, long period) task????ÅÅÔÚdelay??ºÁÃë??Ö???µÄÊ??äºóÖ?ÐÐ??Ö?Ðкó??Ã??ôperiod(ºÁÃë)????Ö?ÐÐ?? 8.public void scheduleAtFixedRate(TimerTask task,Date firstTime, long period) task????ÅÅÔÚfirstTimeÖ???µÄÊ??äÖ?ÐÐ??Ö?Ðкó??Ã??ôperiod(ºÁÃë)????Ö?ÐÐ??Ã?Ò??ÎÖØ??µÄÊ??äÊ?ºÐµÚÒ??ÎÖ?ÐÐ?ø??ÊǺÍÇ?Ò??ÎÖ?ÐÐÓÐ?Ø ??Òò?ËÖ?ÐеÄ×ÜËÙ?ÈÊÇ?Ì??µÄ?? 9.public void scheduleAtFixedRate(TimerTask task,long delay,long period) task????ÅÅÔÚdelay??ºÁÃë??Ö???µÄÊ??äºóÖ?ÐÐ??Ö?Ðкó??Ã??ôperiod(ºÁÃë)????Ö?ÐÐ??Ã?Ò??ÎÖØ??µÄÊ??äÊ?ºÐµÚÒ??ÎÖ?ÐÐ?ø??ÊǺÍÇ?Ò??ÎÖ? ÐÐÓÐ?Ø??Òò?ËÖ?ÐеÄ×ÜËÙ?ÈÊÇ?Ì??µÄ?? TimerTaskµÄÖ?Òª?????º 1.public boolean cancel() ÖÕÖ?ÈÎÎñµÄÖ?ÐÐÔËÐÐ??Èç?ûTimerÊ?ÒªÇóÑ,??Ö?ÐеÄ??ÔòÈç?ûÕýÔÚÖ?ÐÐ??ÔòÖ ?ÐÐÍêÁË?ÍÔÙ???áÑ,????Èç?û??Î?Ö?ÐÐ?ò??ÓÚÍ?ЪÆÚ??Ôò???áÖ?ÐÐ ÁË 2.public abstract void run() 3.public long scheduledExecutionTime() ?µ?Ø????ÅÅ×îºóÖ?ÐÐÈÎÎñµÄÊ??ä??Ò??ãÈ???ÈÎÎñµÄµ??ñµÄʵÐÐÊÇ?ñ×ã????Ê? ??Ö?Ã??øÐÐ???Æ??µÄ?î??ΪÕýµ??º public void run() { if (System.currentTimeMillis() - scheduledExecutionTime() >= MAX_TARDINESS) return; // Too late; skip this execution. // Perform the task } 4.protected TimerTask() Àý?º impimport java.io.*; public class doTask extends TimerTask { String index; Timer myTimer = new Timer(); public doTask(String index) { this.index = index; } public void run() { System.out.println(index); } public static void main(String args[]) { doTask myTask1 = new doTask("First task"); myTask1.start(0,3); doTask myTask2 = new doTask("Second task"); myTask2.start(0,1); try{ Thread.sleep(6000); } catch(InterruptedException e){ } myTask1.end(); myTask2.end();//?ÌÐò?áÊøÊ?ÓÃcancel()?áÊøTimer } public void start(int delay, int internal) { myTimer.schedule(this, delay * 1000, internal * 1000); //ÀûÓÃtimer.schedule???? } public void end(){ myTimer.cancel(); } } Êä?ö?º First task Second task Second task Second task First task Second task Second task Second task =================================================== timer??timertaskµÄÓÃ?? Ê?ÓÃTimerTask import java.util.Timer; import java.util.TimerTask; import java.util.Date; /** * @author vincent */ public class TimerTest { public static void main(String[] args) { Timer t = new Timer(); //ÔÚ5ÃëÖ?ºóÖ?ÐÐTimerTaskµÄÈÎÎñ t.schedule(new TimerTask(){ public void run() {System.out.println("this is task you do1");} },5*1000); //ÔÚDateÖ???µÄÌØ??Ê??ÌÖ?ºóÖ?ÐÐTimerTaskµÄÈÎÎñ Date d1 = new Date(System.currentTimeMillis()+1000); t.schedule(new TimerTask(){ public void run() {System.out.println("this is task you do2");} },d1); //ÔÚDateÖ???µÄÌØ??Ê??ÌÖ?ºó,Ã??ô1ÃëÖ?ÐÐTimerTaskµÄÈÎÎñÒ??Î Date d2 = new Date(System.currentTimeMillis()+1000); t.schedule(new TimerTask(){ public void run() {System.out.println("this is task you do3");} },d2,1*1000); //ÔÚ3ÃëÖ?ºó,Ã??ô1ÃëÖ?ÐÐTimerTaskµÄÈÎÎñÒ??Î t.schedule(new TimerTask(){ public void run() {System.out.println("this is task you do4");} },3*1000,1*1000); //ÔÚ3ÃëÖ?ºó,?ø?ÔÃ??ô2ÃëÖ?ÐÐTimerTaskµÄÈÎÎñÒ??Î t.scheduleAtFixedRate(new TimerTask(){ public void run() {System.out.println("this is task you do6");} },3*1000,2*1000); } scheduleºÍscheduleAtFixedRateµÄÇø?ðÔÚÓÚ??Èç?ûÖ????ªÊ?Ö?ÐеÄÊ??äÔÚµ?Ç?ϵÍ?ÔËÐÐÊ??äÖ?Ç???scheduleAtFixedRate?á?ÑÒÑ?,?ýÈ?µÄÊ??äÒ?×?ΪÖÜÆÚÖ?ÐÐ???øschedule???á?Ñ?ýÈ?µÄÊ??äËãÉÏ?? ?ÈÈç SimpleDateFormat fTime = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); Date d1 = fTime.parse("2005/12/30 14:10:00"); t.scheduleAtFixedRate(new TimerTask(){ public void run() { System.out.println("this is task you do6"); } },d1,3*60*1000); ?ä?ôÊ??äÊÇ3?ÖÖÓ??Ö????ªÊ?Ê??äÊÇ2005/12/30 14:10:00??Èç?ûÎÒÔÚ14:17:00?ÖÖ?ÐÐÕâ?ö?ÌÐò??ÄÇÃ??áÁ??Ì?òÓ?3?Î this is task you do6 //14:10 this is task you do6 //14:13 this is task you do6 //14:16 ??ÇÒ×?Òâ??ÏÂÒ??ÎÖ?ÐÐÊÇÔÚ14:19 ?ø??ÊÇ 14:20???ÍÊÇ˵ÊÇ?ÓÖ???µÄ?ªÊ?Ê??ä?ªÊ? µ?ÊÇÉÏÃæÈç?ûÓÃschedule???????ä?ôÊ??äÊÇ3?ÖÖÓ??Ö????ªÊ?Ê??äÊÇ2005/12/30 14:10:00??ÄÇÃ?ÔÚ14:17:00?ÖÖ?ÐÐÕâ?ö?ÌÐò??ÔòÁ???Ö?ÐÐ?ÌÐòÒ??Î????ÇÒÏÂÒ??εÄÖ?ÐÐÊ??äÊÇ 14:20???ø??ÊÇ?Ó14:10?ªÊ?ËãµÄÖÜÆÚ(14:19)?? }