init

src/main/java/com/jenny/xp2items/Xp2Items.java

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+package com.jenny.xp2items;
+
+import com.jenny.xp2items.config.ServerConfig;
+import com.jenny.xp2items.items.items;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.eventbus.api.IEventBus;
+import net.minecraftforge.fml.ModLoadingContext;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.config.ModConfig;
+import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
+
+@Mod(Xp2Items.MODID)
+public class Xp2Items {
+
+    public static final String MODID = "xp2items";
+
+    public Xp2Items(FMLJavaModLoadingContext context) {
+        IEventBus modEventBus = context.getModEventBus();
+
+        items.register(modEventBus);
+        creativeTab.register(modEventBus);
+
+        MinecraftForge.EVENT_BUS.register(this);
+        ModLoadingContext.get().registerConfig(ModConfig.Type.COMMON, ServerConfig.SPEC, "xp2items.toml");
+
+    }
+}

src/main/java/com/jenny/xp2items/config/ServerConfig.java

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+package com.jenny.xp2items.config;
+
+import net.minecraftforge.common.ForgeConfigSpec;
+import net.minecraftforge.fml.common.Mod;
+
+import static com.jenny.xp2items.Xp2Items.MODID;
+
+@Mod.EventBusSubscriber(modid = MODID, bus = Mod.EventBusSubscriber.Bus.MOD)
+public class ServerConfig {
+    private static final ForgeConfigSpec.Builder BUILDER = new ForgeConfigSpec.Builder();
+    public static final ForgeConfigSpec SPEC;
+
+    public static final ForgeConfigSpec.ConfigValue<Integer> C_XP_AMOUNT;
+    public static final ForgeConfigSpec.ConfigValue<Integer> C_ITEM_AMOUNT;
+
+    static {
+        C_XP_AMOUNT = BUILDER.comment("xp needed per loot drop, 0=per level").define("xp_amount", 25);
+        C_ITEM_AMOUNT = BUILDER.comment("items per loot drop").define("item_amount", 1);
+
+        SPEC = BUILDER.build();
+    }
+}

src/main/java/com/jenny/xp2items/creativeTab.java

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+package com.jenny.xp2items;
+
+import com.jenny.xp2items.items.items;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.network.chat.Component;
+import net.minecraft.world.item.CreativeModeTab;
+import net.minecraft.world.item.CreativeModeTabs;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+import net.minecraftforge.eventbus.api.IEventBus;
+import net.minecraftforge.registries.DeferredRegister;
+import net.minecraftforge.registries.RegistryObject;
+
+import java.util.Arrays;
+
+import static com.jenny.xp2items.Xp2Items.MODID;
+
+public class creativeTab {
+    public static final DeferredRegister<CreativeModeTab> CREATIVE_MODE_TABS = DeferredRegister.create(Registries.CREATIVE_MODE_TAB, MODID);
+    public static final RegistryObject<CreativeModeTab> CREATIVE_TAB = CREATIVE_MODE_TABS.register("xp2items", () -> CreativeModeTab.builder().withTabsBefore(CreativeModeTabs.SPAWN_EGGS).icon(() -> items.XP_TALISMAN.get().getDefaultInstance()).displayItems((parameters, output) -> output.acceptAll(Arrays.stream(getItems()).toList())).title(Component.literal("xp2items")).build());
+
+    public static void register(IEventBus bus) {
+        CREATIVE_MODE_TABS.register(bus);
+    }
+
+    public static ItemStack[] getItems() {
+        ItemStack[] ret = new ItemStack[items.ITEMS.getEntries().size()];
+        int i = 0;
+        for (RegistryObject<Item> item : items.ITEMS.getEntries()) {
+            ret[i] = item.get().getDefaultInstance();
+            i++;
+        }
+        return ret;
+    }
+}

src/main/java/com/jenny/xp2items/items/items.java

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+package com.jenny.xp2items.items;
+
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.item.Item;
+import net.minecraftforge.eventbus.api.IEventBus;
+import net.minecraftforge.registries.DeferredRegister;
+import net.minecraftforge.registries.ForgeRegistries;
+import net.minecraftforge.registries.RegistryObject;
+
+import static com.jenny.xp2items.Xp2Items.MODID;
+
+public class items {
+    public static final DeferredRegister<Item> ITEMS = DeferredRegister.create(ForgeRegistries.ITEMS, MODID);
+
+    public static final RegistryObject<Item> XP_TALISMAN = ITEMS.register("xp_talisman", () -> new xpTalisman(new Item.Properties().setId(ResourceKey.create(Registries.ITEM, ResourceLocation.fromNamespaceAndPath(MODID, "xp_talisman"))).stacksTo(1)));
+
+    public static void register(IEventBus bus) {
+        ITEMS.register(bus);
+    }
+
+}

src/main/java/com/jenny/xp2items/items/xpTalisman.java

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+package com.jenny.xp2items.items;
+
+import com.jenny.xp2items.config.ServerConfig;
+import net.minecraft.server.commands.ExperienceCommand;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.util.Mth;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.InteractionResult;
+import net.minecraft.world.entity.item.ItemEntity;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.Level;
+import net.minecraftforge.registries.ForgeRegistries;
+import org.apache.logging.log4j.core.jmx.Server;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+public class xpTalisman extends Item {
+    public xpTalisman(Properties properties) {
+        super(properties);
+    }
+
+    @Override
+    public @NotNull InteractionResult use(@NotNull Level level, @NotNull Player player, @NotNull InteractionHand interactionHand) {
+        if (!level.isClientSide) {
+            if (ServerConfig.C_XP_AMOUNT.get() > 0) { // xp amount mode
+                spawnItem(level, (ServerPlayer) player);
+            } else { // xp level mode
+                spawnItemLevels(level, (ServerPlayer) player);
+            }
+        }
+        return InteractionResult.SUCCESS;
+    }
+
+    private static void spawnItem(Level level, ServerPlayer player) {
+        List<Item> itemList = ForgeRegistries.ITEMS.getValues().stream().toList();
+        int xpNeeded = ServerConfig.C_XP_AMOUNT.get();
+        System.out.println(getPlayerXP(player));
+        while (true) {
+            int expLevelBefore = player.experienceLevel;
+            float expProgressBefore = player.experienceProgress;
+            player.giveExperiencePoints(-xpNeeded);
+            if (getPlayerXP(player) == 0 && player.experienceLevel == 0) {
+                player.experienceLevel = expLevelBefore;
+                player.experienceProgress = expProgressBefore;
+                break;
+            } else {
+                System.out.println("item dropped");
+                Item item = itemList.get(level.getRandom().nextInt(0, itemList.size()));
+                level.addFreshEntity(new ItemEntity(level, player.getX(), player.getY(), player.getZ(), new ItemStack(item)));
+            }
+        }
+    }
+
+    private static int getPlayerXP(ServerPlayer player) {
+        return Mth.floor(player.experienceProgress * (float) player.getXpNeededForNextLevel());
+    }
+
+    private static void spawnItemLevels(Level level, ServerPlayer player) {
+        List<Item> itemList = ForgeRegistries.ITEMS.getValues().stream().toList();
+        int itemsPerLevel = ServerConfig.C_ITEM_AMOUNT.get();
+        int xpPoints = getPlayerXP(player);
+        for (int i = 1; i <= player.experienceLevel; i++) {
+            for (int i2 = 1; i2 <= itemsPerLevel; i2++) {
+                System.out.println("item dropped");
+                Item item = itemList.get(level.getRandom().nextInt(0, itemList.size()));
+                level.addFreshEntity(new ItemEntity(level, player.getX(), player.getY(), player.getZ(), new ItemStack(item)));
+            }
+        }
+        player.setExperienceLevels(0);
+        player.setExperiencePoints(0);
+        player.giveExperiencePoints(xpPoints);
+    }
+}