如何使用Java中的Discord JDA在Discord上发送特定时间的消息

Question

private static GuildAvailableEvent e;
private static final Timer timer = new Timer(1000, new Listener());

public void onGuildAvailable(GuildAvailableEvent event) {
    e = event;
    timer.setRepeats(true);
    timer.start();
    timer.restart();
}

private static class Listener implements ActionListener {
    public void actionPerformed(ActionEvent event) {
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("e HH:mm");
        String time = dtf.format(LocalDateTime.now());
        if(time.charAt(0) == '0' || time.charAt(0) == '2' || time.charAt(0) == '3' || time.charAt(0) == '4' || time.charAt(0) == '5') {
            String message = "Class is starting! Get to class!";
            if(time.substring(2, time.length() - 1).equalsIgnoreCase("08:05")) {
                Objects.requireNonNull(e.getGuild().getDefaultChannel()).sendMessage(message).queue();
            } else if(time.substring(2, time.length() - 1).equalsIgnoreCase("09:25")) {
                Objects.requireNonNull(e.getGuild().getDefaultChannel()).sendMessage(message).queue();
            } else if(time.substring(2, time.length() - 1).equalsIgnoreCase("11:55")) {
                Objects.requireNonNull(e.getGuild().getDefaultChannel()).sendMessage(message).queue();
            } else if(time.substring(2, time.length() - 1).equalsIgnoreCase("13:30")) {
                Objects.requireNonNull(e.getGuild().getDefaultChannel()).sendMessage(message).queue();
            } else if(time.substring(2, time.length() - 1).equalsIgnoreCase("15:39")) { // test time
                Objects.requireNonNull(e.getGuild().getDefaultChannel()).sendMessage(message).queue();
            }
        }
    }
}

Answer 1

您可以使用ReadyEvent，但我建议使用ScheduledExecutorService发送这些消息。

首先，您必须将当前时间与您想要安排邮件的时间进行比较。

public void onReady(@NotNull ReadyEvent event) {

    // get the current ZonedDateTime of your TimeZone
    ZonedDateTime now = ZonedDateTime.now(ZoneId.of("Europe/Berlin"));

    // set the ZonedDateTime of the first lesson at 8:05
    ZonedDateTime nextFirstLesson = now.withHour(8).withMinute(05).withSecond(0);

    // if it's already past the time (in this case 8:05) the first lesson will be scheduled for the next day
    if (now.compareTo(nextFirstLesson) > 0) {
        nextFirstLesson = nextFirstLesson.plusDays(1);
    }

    // duration between now and the beginning of the next first lesson
    Duration durationUntilFirstLesson = Duration.between(now, nextFirstLesson);
    // in seconds
    long initialDelayFirstLesson = durationUntilFirstLesson.getSeconds();

    // schedules the reminder at a fixed rate of one day
    ScheduledExecutorService schedulerFirstLesson = Executors.newScheduledThreadPool(1);
    schedulerFirstLesson.scheduleAtFixedRate(() -> {
        // send a message
        /*
        String message = "Class is starting! Get to class!";
        JDA jda = event.getJDA();
        for (Guild guild : jda.getGuilds()) {
            guild.getDefaultChannel().sendMessage(message).queue();
        }
        */

                },
            initialDelayFirstLesson,
            TimeUnit.DAYS.toSeconds(1),
            TimeUnit.SECONDS);
}

这只是第一课的一个基本想法。其余的由您来实现。