GPT答：

7i24.cn

：

package com.example.playermessage;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.plugin.java.JavaPlugin;
 
public class PlayerMessagePlugin extends JavaPlugin implements Listener {
 
    @Override
    public void onEnable() {
        // Register the event
        getServer().getPluginManager().registerEvents(this, this);
    }
    
    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent event) {
        // Send message to the joining player
        event.getPlayer().sendMessage(ChatColor.GOLD + "Welcome to the server!");

        // Send message to all players
        Bukkit.getServer().broadcastMessage(ChatColor.BLUE + event.getPlayer().getName() + " has joined the server!");
    }
}

这就是一个Minecraft服务器插件，当玩家加入游戏服务器时，会显示：“欢迎加入游戏服务器”，并向所有玩家广播“XXX已经加入了服务器”的信息。