1、场景分析
微信、QQ定时推送步数；网易云音乐定时推送歌单；手机定时闹钟；定时发送邮件；淘宝购物15分钟内付款、10天内自动收货；支付宝蚂蚁森林定时长成；支付宝、京东定时推送账单、信用。
2、使用技术
2.1 Timer定时器
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Timer;
import java.util.TimerTask;
/**
* Created by lq on 2018/10/8.
*/
public class MyTimer {
public static void main(String[] args) {
TimerTask timerTask = new TimerTask() {
@Override
public void run() {
LocalDateTime current = LocalDateTime.now();
String timeString = current.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
System.out.println("task run:"+ timeString);
}
};
Timer timer = new Timer();
//定时任务3秒后启动，每1秒执行一次
timer.schedule(timerTask,3000,1000);
}
}
2.2 ScheduledExecutorService
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class ScheduledExecutorServiceDemo {
public static void main(String[] args) {
ScheduledExecutorService service = Executors.newSingleThreadScheduledExecutor();
LocalDateTime current = LocalDateTime.now();
// 参数：1、任务体 2、首次执行的延时时间
// 3、任务执行间隔 4、间隔时间单位
service.scheduleAtFixedRate(()->System.out.println("task ScheduledExecutorService "+current.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"))), 3, 1, TimeUnit.SECONDS);
}
}
2.3 spring boot quartz
