Need help about map item

I need to saverendered map of map item.

how can i export my map?


Result export with this code

Code:

package jn.pubg;

import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public class PUBG extends JavaPlugin {
   
    public static boolean save;
    Command command = new Command(this);
    public void onEnable() {
        getServer().getPluginManager().registerEvents(plane, this);
        for(Player p : getServer().getOnlinePlayers()) {
            p.setFlySpeed(1f);
        }
    }

}

Code:

package jn.pubg;

import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerCommandPreprocessEvent;
import org.bukkit.event.world.ChunkLoadEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.map.MapView;
import org.bukkit.map.MapView.Scale;


public class Command implements Listener{
   
    PUBG pubg;
    public Command(PUBG pub) {
        pubg = pub;
    }

    @SuppressWarnings("deprecation")
    @EventHandler
    public void onCommand(PlayerCommandPreprocessEvent e) throws InterruptedException {
        if(e.getMessage().equalsIgnoreCase("/s")) {
            PUBG.save=true;
            e.setCancelled(true);
        }
    } 
}

Code:

package jn.pubg;

import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

import org.bukkit.entity.Player;
import org.bukkit.map.MapCanvas;
import org.bukkit.map.MapCursor;
import org.bukkit.map.MapRenderer;
import org.bukkit.map.MapView;
import org.bukkit.map.MinecraftFont;

public class Renderer extends MapRenderer {

    @SuppressWarnings("deprecation")
    @Override
    public void render(MapView view, MapCanvas canvas, Player p) {
        Double x = Math.ceil((((p.getLocation().getX()+1000) / 2000)*255)-128);
        Double z = Math.ceil((((p.getLocation().getZ()+1000) / 2000)*255)-128);

        while(canvas.getCursors().size() > 0)
            canvas.getCursors().removeCursor(canvas.getCursors().getCursor(0));
        MapCursor mc = new MapCursor(x.byteValue(),z.byteValue(),(byte)2,MapCursor.Type.WHITE_CIRCLE.getValue(),true);
        canvas.getCursors().addCursor(mc);
        for(int i=0;i<255;i++)
            for(int j=0;j<255;j++)
                canvas.setPixel(i, j, canvas.getPixel(i, j));
        String string = "PUBG in MC v2017-08-16";
        int width = MinecraftFont.Font.getWidth(string);
        int height = MinecraftFont.Font.getWidth(string);
        canvas.drawText((128-width)/2, (128-height)/2, MinecraftFont.Font, string);
       
        if(PUBG.save == true) {
           final BufferedImage res = new BufferedImage( 255, 255, BufferedImage.TYPE_INT_RGB );
           for (int xxxxx = 0; xxxxx < res.getWidth(); xxxxx++){
               for (int yyyyy = 0; yyyyy < res.getHeight(); yyyyy++){
                   res.setRGB(xxxxx, yyyyy, canvas.getPixel(xxxxx, yyyyy));
               }
           }
           try {
              RenderedImage ri = res;
                ImageIO.write(ri, "PNG", new File("map.png"));
            } catch (IOException e) {
                e.printStackTrace();
            }
           PUBG.save=false;
        }
    }

}

 

@Jaknog
Why do you want to export the map? If you need it as an image file, just take the buffered image and save it has a new file. If you just want to be able to be able to use the same map instance, instead of creating a new map instance and setting the renderer every time, get one map id and reset it's map renderer every time the server reloads.