固定时间点执行任务

package com.huangbei.test2;

import lombok.extern.slf4j.Slf4j;

import java.time.DayOfWeek;
import java.time.Duration;
import java.time.LocalDateTime;
import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/*
固定时间执行任务，比如，每周星期四中午12:30
 */
@Slf4j(topic = "c.Test-ScheduledThreadPool")
public class Test14 {
    public static void main(String[] args) {
        LocalDateTime now = LocalDateTime.now();

        LocalDateTime nextTime = now.withNano(0).withSecond(0).withMinute(30).withHour(12).with(DayOfWeek.MONDAY);
//        LocalDateTime newTime = now.withNano(0).withSecond(0).withMinute(0).withHour(18).plusDays(DayOfWeek.SUNDAY.getValue()-now.getDayOfWeek().getValue());


        //合法性检测
        if (now.compareTo(nextTime) > 0) {
            nextTime = nextTime.plusWeeks(1);
        }
        log.debug("当前时间：{}", now);
        log.debug("新时间：{}", nextTime);


        ScheduledExecutorService pool = Executors.newScheduledThreadPool(2);


        long initialDelay = Duration.between(now, nextTime).toMillis();
        long period = 1 * 1000 * 60 * 60 * 24 * 7;

        log.debug("initialDelay={}", initialDelay);
        pool.scheduleAtFixedRate(() -> {
            log.debug("到了执行的时间，执行这个任务...");
        }, initialDelay, period, TimeUnit.MILLISECONDS);

    }
}