How to format font and text size on a thermal printer using Java

Well, I'm developing a program for a pizzeria and I need to print the orders with their respective pizza flavors, but with correct formatting, bigger letters and such, the default is too small for my needs, follow the code I'm using

import java.io.FileOutputStream;
import java.io.PrintStream;

public class Impressao {
    public static void main(String[] args) {
        FileOutputStream fos = null;
        PrintStream ps = null;
        try{ 
            fos = new FileOutputStream("LPT1:");
        } catch (Exception ex) {}
        try {
            ps = new PrintStream(fos);
        } 
        catch (Exception exception) {} 

        ps.print("Coloque aqui o que você quer");
    }
}