如何获取Minecraft结构方块中的metadata自定义数据？

First, let's break down the core issue here: the metadata value you see in the /data get output is part of the structure block's native NBT data, not the plugin-specific metadata that block.getMetadata() is designed to access. The methods you tried (getBlockData(), getMetadata(""), etc.) don't target this NBT field, which is why they didn't return the value you need.

Here are two reliable ways to fetch that custom metadata value:

1. Use the Bukkit API's StructureBlock Class (Recommended) #

Starting from Minecraft 1.10, Bukkit/Spigot provides a dedicated StructureBlock BlockState implementation that exposes direct methods to access structure block properties—including the metadata field. This is the safest approach since it uses the official API and avoids version-dependent code.

import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.block.StructureBlock;

// Get your target structure block (replace with your coordinates/world)
Block structureBlock = Bukkit.getWorld("your_world_name").getBlockAt(1, 2, 3);

// Verify it's actually a structure block first
if (structureBlock.getType() == Material.STRUCTURE_BLOCK) {
    // Cast the BlockState to StructureBlock to access its specific methods
    StructureBlock sbState = (StructureBlock) structureBlock.getState();
    // Retrieve the metadata value you need
    String customMetadata = sbState.getMetadata();
    
    // Example usage: print the value
    System.out.println("Structure Block Custom Metadata: " + customMetadata);
}

2. Direct NBT Reading (For Older Versions or Edge Cases) #

If you're working with a server version where the StructureBlock API isn't available, or you need to access other raw NBT fields, you can read the tile entity's NBT directly using CraftBukkit's NMS (Net Minecraft Server) classes. Note that this method is version-dependent—adjust the imports to match your server's Minecraft version (e.g., v1_16_R3 for 1.16.5).

import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.craftbukkit.v1_16_R3.CraftWorld;
import org.bukkit.craftbukkit.v1_16_R3.block.CraftBlock;
import net.minecraft.server.v1_16_R3.BlockPosition;
import net.minecraft.server.v1_16_R3.NBTTagCompound;

Block structureBlock = Bukkit.getWorld("your_world_name").getBlockAt(1, 2, 3);

if (structureBlock.getType() == Material.STRUCTURE_BLOCK) {
    CraftBlock craftBlock = (CraftBlock) structureBlock;
    BlockPosition pos = new BlockPosition(craftBlock.getX(), craftBlock.getY(), craftBlock.getZ());
    
    // Fetch the tile entity's raw NBT data
    NBTTagCompound nbt = ((CraftWorld) structureBlock.getWorld()).getHandle().getTileEntity(pos).save(new NBTTagCompound());
    
    // Extract the "metadata" string from the NBT
    String customMetadata = nbt.getString("metadata");
}

Why Your Previous Methods Didn't Work #

• block.getBlockData(): Returns general block state properties (like mode, rotation) but doesn't include tile entity-specific NBT fields like metadata.
• block.getMetadata(String key): This method is for plugin-attached metadata, not the block's native NBT. It stores data that plugins add to blocks, not the values you set in the structure block's UI.

内容的提问来源于stack exchange，提问作者Joss