4

处理允许转移世界的命令，我正在尝试保存玩家库存。

public void savePlayerInv(Player p, World w){
    File playerInvConfigFile = new File(plugin.getDataFolder() + File.separator + "players" + File.separator + p.getName(), "inventory.yml");
    FileConfiguration pInv = YamlConfiguration.loadConfiguration(playerInvConfigFile);
    PlayerInventory inv = p.getInventory();
    int i = 0;

    for (ItemStack stack : inv.getContents()) {
        //increment integer
        i++;
        String startInventory = w.getName() + ".inv." + Integer.toString(i);

        //save inv
        pInv.set(startInventory + ".amount", stack.getAmount());
        pInv.set(startInventory + ".durability", Short.toString(stack.getDurability()));
        pInv.set(startInventory + ".type", stack.getTypeId());
        //pInv.set(startInventory + ".enchantment", stack.getEnchantments());
        //TODO add enchant saveing
    }

    i = 0;
    for (ItemStack armor : inv.getArmorContents()){
            i++;
            String startArmor = w.getName() + ".armor." + Integer.toString(i);

            //save armor
            pInv.set(startArmor + ".amount", armor.getAmount());
            pInv.set(startArmor + ".durability", armor.getDurability());
            pInv.set(startArmor + ".type", armor.getTypeId());
            //pInv.set(startArmor + ".enchantment", armor.getEnchantments());
    }

    //save exp
    if (p.getExp() != 0) {
            pInv.set(w.getName() + ".exp", p.getExp());
    }
}

问题出在第 130 行：

pInv.set(startInventory + ".amount", stack.getAmount());

我得到这个堆栈跟踪：

2012-03-21 13:23:25 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'wtp' in plugin Needs v1.0
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)
at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:461)
at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:818)
at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:778)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:761)
at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:33)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:112)
at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:554)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:452)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:490)
    Caused by: java.lang.NullPointerException
at com.devoverflow.improved.needs.commands.CommandWorldtp.savePlayerInv(CommandWorldtp.java:130)
at com.devoverflow.improved.needs.commands.CommandWorldtp.onCommand(CommandWorldtp.java:60)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
... 12 more
4

1 回答 1

3

当您这样做时inv.getContents()，您会检索玩家库存中的每个插槽，包括空插槽。这些空槽返回null，因为其中没有任何内容。

要解决此问题，请在开始 for 循环后立即添加 if 语句：

for (ItemStack stack : inv.getContents()) {
    if (stack == null) continue;
    // And keep everything else the same
}

您稍后可能会遇到的问题是将所有内容都替换到它来自的完全相同的插槽中。我建议使用 aHashMap或其他东西来跟踪项目来自哪个插槽。

于 2012-03-21T22:06:37.223 回答