如何用JDA将DM发送给有响应的人

Question

event.getUser().openPrivateChannel()
                .flatMap(channel -> channel.sendMessage("Hello, we are sorry you're leaving "+event.getGuild().getName()+", if you don't mind, please tell us why you left or leave any other feedback here, it'll help us improve the server and improve experience for you if you re-join again in the future.\n\nThank you ❤."))
                .queue();

import bot.Main;
import net.dv8tion.jda.api.EmbedBuilder;
import net.dv8tion.jda.api.entities.MessageChannel;
import net.dv8tion.jda.api.entities.User;
import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
import net.dv8tion.jda.api.hooks.ListenerAdapter;

public class Feedback extends ListenerAdapter {
    private final long channelId, authorId;

    public Feedback(MessageChannel channel, User author) {
        this.channelId = channel.getIdLong();
        this.authorId = author.getIdLong();
    }

    @Override
    public void onMessageReceived(MessageReceivedEvent event) {
        if (event.getAuthor().isBot()) return;
        if (event.getAuthor().getIdLong() != authorId) return;
        if (event.getChannel().getIdLong() != channelId) return;
        MessageChannel channel = event.getChannel();
        String content = event.getMessage().getContentRaw();
        event.getChannel().sendMessage("Thanks for your feedback!").queue();
        EmbedBuilder feedback = new EmbedBuilder();
        feedback.setTitle("Automated System Operations - Leaving Feedback");
        feedback.addField("Feedback", content, false);
        feedback.setColor(0xC90004);
        feedback.setAuthor(event.getAuthor().getAsTag()+" - "+event.getAuthor().getId(), "https://support.discord.com/hc/en-us/articles/209572128-How-do-I-log-out-", event.getAuthor().getAvatarUrl());
        feedback.setImage("https://media.discordapp.net/attachments/894913784823566428/896323821336948736/unknown.png?width=384&height=192");
        Main.jda.getGuildById("894913620868202506").getTextChannelById("896322509874540545").sendMessage(feedback.build()).queue();
    }
}

Answer 1

您不必猜测如何使用库--这就是文档的用途。任何有价值的库都有列出每一个类、方法和您需要担心的属性的文档。

在谷歌快速搜索“Discord-JDA文档”，我们可以找到Javadoc：https://ci.dv8tion.net/job/jda/javadoc/index.html

你想向用户发送消息，对吗？因此，让我们使用搜索栏并查找用户。Types下的第一个结果是net.dv8tion.jda.api.entities.user。我们现在在https://ci.dv8tion.net/job/jda/javadoc/net/dv8tion/jda/api/entities/user.html

// Send message without response handling
public void sendMessage(User user, String content) {
    user.openPrivateChannel()
        .flatMap(channel -> channel.sendMessage(content))
        .queue();

event.getAuthor().openPrivateChannel().flatMap(channel -> channel.sendMessage("hello")).queue();