DimensionChange.java

package de.bananaco.change;
import net.minecraft.server.v1_7_R1.*;
import org.bukkit.*;
import org.bukkit.command.*;
import org.bukkit.craftbukkit.entity.CraftPlayer;
import org.bukkit.entity.Player;
import org.bukkit.event.*;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.plugin.java.JavaPlugin;
public class WorldChanger extends JavaPlugin implements Listener {
    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent event) {
        Player player = event.getPlayer();
        if(getConfig().get(player.getWorld().getName()) != null) {
            setDimension(player, getConfig().getInt(player.getWorld().getName(), 0));
        }
    }
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);
    }
    public boolean onCommand(CommandSender sender, Command command,
            String label, String[] args) {
        if(args.length == 2) {
            if(Bukkit.getWorld(args[0]) == null) return false;
            org.bukkit.World w = Bukkit.getWorld(args[0]);
            for(Player p : w.getPlayers()) setDimension(p, getDimension(args[1]));
            getConfig().set(w.getName(), getDimension(args[1]));
            saveConfig();
            sender.sendMessage("Set world: "+w.getName()+" to dimension "+getDimension(args[1]));
            return true;
        }
        return false;
    }
    public int getDimension(String input) {
        try {
            int i = Integer.parseInt(input);
            if(i == 0 || i == -1 || i == 1) return i;
        } catch (Exception e) {}
        return 0;
    }
    public void setDimension(Player player, int dimension) {
        CraftPlayer cp = (CraftPlayer) player;
        PacketPlayOutRespawn packet = new PacketPlayOutRespawn(dimension, (byte) 1, net.minecraft.server.WorldType.NORMAL, player.getWorld().getMaxHeight(), EnumGamemode.a(player.getGameMode().getValue()));
        cp.getHandle().playerConnection.sendPacket(packet);
        org.bukkit.Chunk chunk = player.getWorld().getChunkAt(player.getLocation());
        for(int x=-10; x<10; x++)
            for(int z=-10; z<10; z++)
                player.getWorld().refreshChunk(chunk.getX()+x, chunk.getZ()+z);
    }
}