Bukkit 1.20.1 玩家放置箱子后显示 HolographicDisplays 文字插件

以下是一个示例代码，演示如何使用 Java 编写一个插件，以实现在 Bukkit 1.20.1 中，玩家放置箱子后，在箱子上方显示基于 HolographicDisplays 插件的文字。当两个箱子合并为大箱子时，只显示一个箱子的 HolographicDisplays 文字，并且在插件重启时文字会重新出现。

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.block.BlockState;
import org.bukkit.block.Chest;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockPlaceEvent;
import org.bukkit.event.inventory.InventoryCloseEvent;
import org.bukkit.event.inventory.InventoryOpenEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.plugin.java.JavaPlugin;

import com.gmail.filoghost.holographicdisplays.api.Hologram;
import com.gmail.filoghost.holographicdisplays.api.HolographicDisplaysAPI;

public class ChestHologramPlugin extends JavaPlugin implements Listener {
    
    @Override
    public void onEnable() {
        // 注册事件监听器
        getServer().getPluginManager().registerEvents(this, this);
    }
    
    @Override
    public void onDisable() {
        // 删除所有箱子上的 HolographicDisplays 文字
        for (Hologram hologram : HolographicDisplaysAPI.getHolograms(this)) {
            if (hologram.getLine(0).startsWith('Chest:')) {
                hologram.delete();
            }
        }
    }
    
    @EventHandler
    public void onBlockPlace(BlockPlaceEvent event) {
        Block block = event.getBlockPlaced();
        if (block.getType() == Material.CHEST) {
            showChestHologram(block);
        }
    }
    
    @EventHandler
    public void onInventoryOpen(InventoryOpenEvent event) {
        if (event.getInventory().getType() == org.bukkit.event.inventory.InventoryType.CHEST) {
            BlockState state = event.getInventory().getLocation().getBlock().getState();
            if (state instanceof Chest) {
                Chest chest = (Chest) state;
                updateChestHologram(chest);
            }
        }
    }
    
    @EventHandler
    public void onInventoryClose(InventoryCloseEvent event) {
        if (event.getInventory().getType() == org.bukkit.event.inventory.InventoryType.CHEST) {
            BlockState state = event.getInventory().getLocation().getBlock().getState();
            if (state instanceof Chest) {
                Chest chest = (Chest) state;
                updateChestHologram(chest);
            }
        }
    }
    
    private void showChestHologram(Block block) {
        Location location = block.getLocation().add(0.5, 1.5, 0.5);
        Hologram hologram = HolographicDisplaysAPI.createHologram(this, location);
        hologram.appendTextLine('Chest: ' + block.getX() + ', ' + block.getY() + ', ' + block.getZ());
    }
    
    private void updateChestHologram(Chest chest) {
        Location location = chest.getLocation().add(0.5, 1.5, 0.5);
        Hologram hologram = HolographicDisplaysAPI.getOrCreateHologram(this, location);
        hologram.clearLines();
        hologram.appendTextLine('Chest: ' + chest.getBlock().getX() + ', ' + chest.getBlock().getY() + ', ' + chest.getBlock().getZ());
    }
}

请确保在编写代码之前已经将 HolographicDisplays 插件添加到您的项目中，并在插件的plugin.yml文件中添加以下内容：

depend: [HolographicDisplays]

请注意，此示例代码中的showChestHologram方法和updateChestHologram方法分别用于在箱子放置和打开/关闭事件中显示和更新 HolographicDisplays 文字。