JDA -在GuildMessageReactionAdd / Discord中获取消息的作者

public void onGuildMessageReactionAdd(GuildMessageReactionAddEvent event) {
    // 获取事件对象
    MessageReactionAddEvent reactionEvent = event.getReactionEvent();
    // ...
}

public void onGuildMessageReactionAdd(GuildMessageReactionAddEvent event) {
    // 获取消息对象
    Message message = event.getMessageReaction().retrieveMessage().complete();
    // ...
}

public void onGuildMessageReactionAdd(GuildMessageReactionAddEvent event) {
    // 获取消息对象
    Message message = event.getMessageReaction().retrieveMessage().complete();
    // 获取消息的作者
    User author = message.getAuthor();
    // ...
}