java | 定时任务

让程序每周四 18:00:00 定时执行任务。

package com.redisc;

import lombok.extern.slf4j.Slf4j;

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

@Slf4j(topic = "c.Test")
public class Run {

    public static void main(String[] args) throws InterruptedException, ExecutionException {
        ScheduledExecutorService pool = Executors.newScheduledThreadPool(1);
        // 获取当前时间
        LocalDateTime now = LocalDateTime.now();
        LocalDateTime time = now.withHour(18).withMinute(0).withSecond(0).withNano(0).with(DayOfWeek.THURSDAY);
        // 如果当前时间 > 本周四，找下周时间
        if (now.compareTo(time) > 0) {
            time = time.plusWeeks(1);
        }
        // initialDelay 代表时间和周四的时间差
        long initailDelay = Duration.between(now, time).toMillis();
        long period = 1000 * 60 * 60 * 24 * 7;
        pool.scheduleWithFixedDelay(() -> {
            System.out.println("running...");
        }, initailDelay, period, TimeUnit.MILLISECONDS);
    }
}