Java Discord4j如何向通道REST API发送消息？

<dependency>
    <groupId>com.discord4j</groupId>
    <artifactId>discord4j-core</artifactId>
    <version>3.1.0</version>
</dependency>

DiscordClient client = DiscordClient.builder("YOUR_BOT_TOKEN").build();

client.login().block();

DiscordRestClient restClient = client.rest();

MessageCreateSpec messageSpec = restClient.getChannelById("CHANNEL_ID")
        .createMessage("Hello, World!");

messageSpec.send().block();

import discord4j.core.DiscordClient;
import discord4j.core.DiscordRestClient;
import discord4j.core.event.domain.message.MessageCreateEvent;
import discord4j.core.object.entity.Message;
import discord4j.core.spec.MessageCreateSpec;

public class DiscordBot {
    public static void main(String[] args) {
        DiscordClient client = DiscordClient.builder("YOUR_BOT_TOKEN").build();
        client.login().block();

        DiscordRestClient restClient = client.rest();
        MessageCreateSpec messageSpec = restClient.getChannelById("CHANNEL_ID")
                .createMessage("Hello, World!");

        messageSpec.send().block();

        client.getEventDispatcher().on(MessageCreateEvent.class)
                .subscribe(event -> handleMessage(event.getMessage()));
    }

    private static void handleMessage(Message message) {
        // 处理收到的消息
    }
}