JDA-新用户加入公会的事件

Question

我有一个问题，我试图使用Java不和谐API（JDA）编写机器人代码。当新用户加入服务器时，机器人应该发送一条消息，但我的代码不起作用。代码：

    public class UserJoinModule extends ListenerAdapter {
        public void onGuildMemberJoined(GuildMemberJoinEvent event) throws LoginException {
            String user = event.getMember().getAsMention();
            JDA client = new JDABuilder("awesome token").build();
            final List<TextChannel> channels = client.getTextChannelsByName("awesome channel name", true);
            for (final TextChannel ch : channels) {
                ch.sendMessage("New member joined: " + user).queue();
            }
        }

    }

有人能告诉我怎么了吗？

Answer 1

对我来说，问题不是来自我重写的侦听器和方法。我相信您必须添加网关意图。帮会成员到您的JDABuilder。

builder.enableIntents(GatewayIntent.GUILD_MEMBERS);

这为我解决了同样的问题。

Answer 2

您的代码中有两个问题。

1. 每次成员加入时，您都在创建一个新的JDA客户端。
2. 您正在向每个公会中的每个具有该名称的通道发送消息。不仅仅是用户加入的公会。

以下是您想要做的：

public class UserJoinModule extends ListenerAdapter {
    @Override
    public void onGuildMemberJoin(GuildMemberJoinEvent event) {
        Guild guild = event.getGuild(); // Get the guild that the user joined.
        User user = event.getUser();    // Get the user that joined.
        JDA client = event.getJDA();    // Get the already existing JDA instance.

        List<TextChannel> channels = guild.getTextChannelsByName("awesome channel name", true); // Get the list of channels in the guild that matches that name.

        for (TextChannel channel : channels) { // Loops through the channels and sends a message to each one.
            channel.sendMessage("New member joined: " + user).queue();
        }
    }
}

Answer 3

您的代码应该如下所示：

public class UserJoinModule extends ListenerAdapter {
    @Override // USE THIS WHEN YOU WANT TO OVERRIDE A METHOD
    public void onGuildMemberJoin(GuildMemberJoinEvent event) {
        String user = event.getMember().getAsMention();
        JDA client = event.getJDA(); // DO NOT CREATE A NEW JDA INSTANCE EVERY TIME
        List<TextChannel> channels = client.getTextChannelsByName("awesome channel name", true);
        for (TextChannel ch : channels) {
            ch.sendMessage("New member joined: " + user).queue();
        }
    }
}

您必须在JDABuilder实例中注册此侦听器，最好在整个代码库中只有一个侦听器。请参见addEventListeners。