任务调度线程池-应用定时任务

任务调度线程池-应用定时任务
示例每周四18:00:00 执行

        // 获得当前时间
        LocalDateTime now = LocalDateTime.now();
        // 获取本周四 18:00:00.000
        LocalDateTime thursday =
                now.with(DayOfWeek.THURSDAY).withHour(18).withMinute(0).withSecond(0).withNano(0);
        // 如果当前时间已经超过 本周四 18:00:00.000， 那么找下周四 18:00:00.000
        if (now.compareTo(thursday) >= 0) {
            thursday = thursday.plusWeeks(1);
        }
        // 计算时间差，即延时执行时间
        long initialDelay = Duration.between(now, thursday).toMillis();
        // 计算间隔时间，即 1 周的毫秒值
        long oneWeek = 7 * 24 * 3600 * 1000;
        ScheduledExecutorService executor = Executors.newScheduledThreadPool(2);
        System.out.println("开始时间：" + new Date());
        executor.scheduleAtFixedRate(() -> {
            System.out.println("执行时间：" + new Date());
        }, initialDelay, oneWeek, TimeUnit.MILLISECONDS);
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