Serialize and deserialize inventories to a string.

BukkitSerialization.java

package com.comphenix.example;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.bukkit.Bukkit;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.util.io.BukkitObjectInputStream;
import org.bukkit.util.io.BukkitObjectOutputStream;
import org.yaml.snakeyaml.external.biz.base64Coder.Base64Coder;

public class BukkitSerialization {
    public static String toBase64(Inventory inventory) {
        try {
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            BukkitObjectOutputStream dataOutput = new BukkitObjectOutputStream(outputStream);
            
            // Write the size of the inventory
            dataOutput.writeInt(inventory.getSize());
            
            // Save every element in the list
            for (int i = 0; i < inventory.getSize(); i++) {
                dataOutput.writeObject(inventory.getItem(i));
            }
            
            // Serialize that array
            dataOutput.close();
            return Base64Coder.encodeLines(outputStream.toByteArray());
        } catch (Exception e) {
            throw new IllegalStateException("Unable to save item stacks.", e);
        }        
    }
    
    public static Inventory fromBase64(String data) throws IOException {
        try {
            ByteArrayInputStream inputStream = new ByteArrayInputStream(Base64Coder.decodeLines(data));
            BukkitObjectInputStream dataInput = new BukkitObjectInputStream(inputStream);
            Inventory inventory = Bukkit.getServer().createInventory(null, dataInput.readInt());
    
            // Read the serialized inventory
            for (int i = 0; i < inventory.getSize(); i++) {
                inventory.setItem(i, (ItemStack) dataInput.readObject());
            }
            dataInput.close();
            return inventory;
        } catch (ClassNotFoundException e) {
            throw new IOException("Unable to decode class type.", e);
        }
    }
}

Unfortunately, looks like this version doesn't support attributes (in #2982). I recommend using this version if that is a concern.

Works perfect with 1.12 version, thanks for this!

When im Using this my Console shows "Chests must have a size that is a multiple of 9!"

Its possible to have exemple ?

can i Serialize player inventory?