JDA Discord机器人删除文本通道中的所有消息

import net.dv8tion.jda.api.JDA;
import net.dv8tion.jda.api.entities.Message;
import net.dv8tion.jda.api.entities.TextChannel;
import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
import net.dv8tion.jda.api.hooks.ListenerAdapter;

import javax.annotation.Nonnull;

public class MessageDeletionBot extends ListenerAdapter {
    private final JDA jda;

    public MessageDeletionBot(JDA jda) {
        this.jda = jda;
    }

    @Override
    public void onMessageReceived(@Nonnull MessageReceivedEvent event) {
        if (event.getAuthor().isBot()) return; // 忽略其他机器人发送的消息

        if (event.getMessage().getContentRaw().equalsIgnoreCase("!deleteAll")) {
            TextChannel channel = event.getTextChannel();
            channel.getHistory().retrievePast(100).queue(messages -> {
                channel.deleteMessages(messages).queue();
            });
        }
    }
}