level.dat Reader

LevelDatReader.java

package com.github.suprememortal.leveldatreader;

import com.nukkitx.nbt.stream.LittleEndianDataInputStream;
import com.nukkitx.nbt.stream.NBTInputStream;
import com.nukkitx.nbt.tag.Tag;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class LevelDatReader {

    public static void main(String[] args) {
        Path path = Paths.get("level.dat"); // Same directory as jar

        try (InputStream inStream = Files.newInputStream(path)) {
            LittleEndianDataInputStream dataInputStream = new LittleEndianDataInputStream(new DataInputStream(inStream));
            int version = dataInputStream.readInt();
            int length = dataInputStream.readInt();

            NBTInputStream nbtInputStream = new NBTInputStream(dataInputStream);

            Tag<?> tag = nbtInputStream.readTag();

            System.out.println("Version " + version);
            System.out.println("Length " + length);
            System.out.println(tag.toString());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

Output

Version 8
Length 1794
TAG_Compound: 77 entries
(
   TAG_Int("lightningTime"): 12103
   TAG_Byte("commandblocksenabled"): 1
   TAG_Int("randomtickspeed"): 1
   TAG_Int("Platform"): 2
   TAG_Int("Difficulty"): 0
   TAG_Byte("naturalregeneration"): 1
   TAG_Byte("hasLockedResourcePack"): 0
   TAG_Byte("texturePacksRequired"): 0
   TAG_Byte("bonusChestEnabled"): 0
   TAG_Int("GameType"): 1
   TAG_Byte("isFromWorldTemplate"): 0
   TAG_Byte("dofiretick"): 1
   TAG_Compound("abilities"): 17 entries
   (
      TAG_Byte("lightning"): 0
      TAG_Byte("mine"): 1
      TAG_Byte("mayfly"): 0
      TAG_Byte("op"): 1
      TAG_Float("walkSpeed"): 0.1
      TAG_Int("permissionsLevel"): 2
      TAG_Byte("teleport"): 1
      TAG_Byte("attackplayers"): 1
      TAG_Float("flySpeed"): 0.05
      TAG_Byte("instabuild"): 0
      TAG_Byte("invulnerable"): 0
      TAG_Byte("build"): 1
      TAG_Byte("flying"): 0
      TAG_Byte("attackmobs"): 1
      TAG_Byte("opencontainers"): 1
      TAG_Byte("doorsandswitches"): 1
      TAG_Int("playerPermissionsLevel"): 2
   )
   TAG_Byte("hasBeenLoadedInCreative"): 1
   TAG_Float("lightningLevel"): 0.62573946
   TAG_Int("maxcommandchainlength"): 65535
   TAG_Byte("XBLBroadcastIntent"): 1
   TAG_Byte("startWithMapEnabled"): 0
   TAG_Byte("bonusChestSpawned"): 0
   TAG_Byte("MultiplayerGame"): 1
   TAG_Byte("drowningdamage"): 1
   TAG_Float("rainLevel"): 1.0
   TAG_List("lastOpenedWithVersion"): 4 entries of type TAG_INT
   {
      TAG_Int: 1
      TAG_Int: 8
      TAG_Int: 0
      TAG_Int: 24
   }
   TAG_Int("SpawnY"): 32767
   TAG_Int("SpawnZ"): 0
   TAG_Byte("eduLevel"): 0
   TAG_Int("SpawnX"): 0
   TAG_Byte("doentitydrops"): 1
   TAG_String("prid"): 
   TAG_Int("serverChunkTickRange"): 12
   TAG_Byte("pvp"): 1
   TAG_Byte("keepinventory"): 0
   TAG_Long("worldStartCount"): 4294967281
   TAG_Byte("ForceGameType"): 1
   TAG_String("LevelName"): pf8bAHOAEQQ
   TAG_Byte("isWorldTemplateOptionLocked"): 0
   TAG_Byte("firedamage"): 1
   TAG_Byte("educationFeaturesEnabled"): 1
   TAG_Int("XBLBroadcastMode"): 1
   TAG_Int("Generator"): 2
   TAG_Long("RandomSeed"): 1790941856
   TAG_Byte("sendcommandfeedback"): 1
   TAG_Byte("dodaylightcycle"): 1
   TAG_Int("NetworkVersion"): 291
   TAG_Long("Time"): 109091
   TAG_Byte("commandblockoutput"): 1
   TAG_Byte("commandsEnabled"): 1
   TAG_Int("PlatformBroadcastMode"): 3
   TAG_Byte("spawnMobs"): 1
   TAG_Int("LimitedWorldOriginY"): 32767
   TAG_Int("LimitedWorldOriginX"): 0
   TAG_String("InventoryVersion"): 1.7.1
   TAG_Byte("CenterMapsToOrigin"): 0
   TAG_Byte("falldamage"): 1
   TAG_Byte("tntexplodes"): 1
   TAG_Int("LimitedWorldOriginZ"): 0
   TAG_Byte("domobloot"): 1
   TAG_Byte("domobspawning"): 0
   TAG_Long("currentTick"): 4333091
   TAG_Byte("isFromLockedTemplate"): 0
   TAG_Byte("PlatformBroadcast"): 1
   TAG_Int("rainTime"): 12103
   TAG_Byte("doweathercycle"): 1
   TAG_Byte("LANBroadcast"): 1
   TAG_Byte("experimentalgameplay"): 1
   TAG_Long("LastPlayed"): 1544974934
   TAG_Int("NetherScale"): 8
   TAG_Byte("useMsaGamertagsOnly"): 1
   TAG_Byte("hasLockedBehaviorPack"): 0
   TAG_Byte("doinsomnia"): 1
   TAG_Byte("mobgriefing"): 1
   TAG_String("FlatWorldLayers"): null

   TAG_Byte("XBLBroadcast"): 1
   TAG_Byte("dotiledrops"): 1
   TAG_Int("StorageVersion"): 8
   TAG_Byte("immutableWorld"): 0
   TAG_Byte("showcoordinates"): 1
)

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.github.suprememortal</groupId>
    <artifactId>leveldatreader</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <repositories>
        <repository>
            <id>nukkitx-repo</id>
            <url>https://repo.nukkitx.com/snapshot</url>
        </repository>
    </repositories>

    <dependencies>
        <dependency>
            <groupId>com.nukkitx</groupId>
            <artifactId>nbt</artifactId>
            <version>1.1.2-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifestEntries>
                            <addClasspath>true</addClasspath>
                            <classpathPrefix>lib/</classpathPrefix>
                            <Main-Class>com.github.suprememortal.leveldatreader.LevelDatReader</Main-Class>
                        </manifestEntries>
                    </archive>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>