gistfile1.txt

https://www.mets-blog.com/java-pos-thermal-printer-example/
https://stackoverflow.com/questions/17505070/printing-reciepts-with-thermal-printer-in-java/39381849

Here it is, usb pos thermal printer solution. It is purely in java. The only condition is that your printer is recognized by the OS as a printer 🙂
That means it will show up in the printers list and queue. Getting the latest drivers should do it.
And as a bonus it works in Windows, Mac, Linux(yes tried in all of them). You are welcome Internet.

Note: If anyone knows how to draw stuff and change fonts with pos commands will be great. Make small tutorial in java.

PrinterService.java

import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.util.ArrayList;
import java.util.List;

import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.SimpleDoc;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;

public class PrinterService implements Printable {
	
	public List<String> getPrinters(){
		
		DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE;
		PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
		
		PrintService printServices[] = PrintServiceLookup.lookupPrintServices(
				flavor, pras);
		
		List<String> printerList = new ArrayList<String>();
		for(PrintService printerService: printServices){
			printerList.add( printerService.getName());
		}
		
		return printerList;
	}

	@Override
	public int print(Graphics g, PageFormat pf, int page)
			throws PrinterException {
		if (page > 0) { /* We have only one page, and 'page' is zero-based */
			return NO_SUCH_PAGE;
		}

		/*
		 * User (0,0) is typically outside the imageable area, so we must
		 * translate by the X and Y values in the PageFormat to avoid clipping
		 */
		Graphics2D g2d = (Graphics2D) g;
		g2d.translate(pf.getImageableX(), pf.getImageableY());
		/* Now we perform our rendering */

		g.setFont(new Font("Roman", 0, 8));
		g.drawString("Hello world !", 0, 10);

		return PAGE_EXISTS;
	}

	public void printString(String printerName, String text) {
		
		// find the printService of name printerName
		DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE;
		PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();

		PrintService printService[] = PrintServiceLookup.lookupPrintServices(
				flavor, pras);
		PrintService service = findPrintService(printerName, printService);

		DocPrintJob job = service.createPrintJob();

		try {

			byte[] bytes;

			// important for umlaut chars
			bytes = text.getBytes("CP437");

			Doc doc = new SimpleDoc(bytes, flavor, null);

			
			job.print(doc, null);

		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	public void printBytes(String printerName, byte[] bytes) {
		
		DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE;
		PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();

		PrintService printService[] = PrintServiceLookup.lookupPrintServices(
				flavor, pras);
		PrintService service = findPrintService(printerName, printService);

		DocPrintJob job = service.createPrintJob();

		try {

			Doc doc = new SimpleDoc(bytes, flavor, null);

			job.print(doc, null);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private PrintService findPrintService(String printerName,
			PrintService[] services) {
		for (PrintService service : services) {
			if (service.getName().equalsIgnoreCase(printerName)) {
				return service;
			}
		}

		return null;
	}
}

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import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.util.ArrayList;
import java.util.List;
 
import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.SimpleDoc;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
 
public class PrinterService implements Printable {
	
	public List<String> getPrinters(){
		
		DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE;
		PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
		
		PrintService printServices[] = PrintServiceLookup.lookupPrintServices(
				flavor, pras);
		
		List<String> printerList = new ArrayList<String>();
		for(PrintService printerService: printServices){
			printerList.add( printerService.getName());
		}
		
		return printerList;
	}
 
	@Override
	public int print(Graphics g, PageFormat pf, int page)
			throws PrinterException {
		if (page > 0) { /* We have only one page, and 'page' is zero-based */
			return NO_SUCH_PAGE;
		}
 
		/*
		 * User (0,0) is typically outside the imageable area, so we must
		 * translate by the X and Y values in the PageFormat to avoid clipping
		 */
		Graphics2D g2d = (Graphics2D) g;
		g2d.translate(pf.getImageableX(), pf.getImageableY());
		/* Now we perform our rendering */
 
		g.setFont(new Font("Roman", 0, 8));
		g.drawString("Hello world !", 0, 10);
 
		return PAGE_EXISTS;
	}
 
	public void printString(String printerName, String text) {
		
		// find the printService of name printerName
		DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE;
		PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
 
		PrintService printService[] = PrintServiceLookup.lookupPrintServices(
				flavor, pras);
		PrintService service = findPrintService(printerName, printService);
 
		DocPrintJob job = service.createPrintJob();
 
		try {
 
			byte[] bytes;
 
			// important for umlaut chars
			bytes = text.getBytes("CP437");
 
			Doc doc = new SimpleDoc(bytes, flavor, null);
 
			
			job.print(doc, null);
 
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
 
	}
 
	public void printBytes(String printerName, byte[] bytes) {
		
		DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE;
		PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
 
		PrintService printService[] = PrintServiceLookup.lookupPrintServices(
				flavor, pras);
		PrintService service = findPrintService(printerName, printService);
 
		DocPrintJob job = service.createPrintJob();
 
		try {
 
			Doc doc = new SimpleDoc(bytes, flavor, null);
 
			job.print(doc, null);
 
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private PrintService findPrintService(String printerName,
			PrintService[] services) {
		for (PrintService service : services) {
			if (service.getName().equalsIgnoreCase(printerName)) {
				return service;
			}
		}
 
		return null;
	}
}
 
Main.java

public class Main {

	public static void main(String[] args) {

		PrinterService printerService = new PrinterService();
		
		System.out.println(printerService.getPrinters());
				
		//print some stuff
		printerService.printString("EPSON-TM-T20II", "\n\n testing testing 1 2 3eeeee \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");

		// cut that paper!
		byte[] cutP = new byte[] { 0x1d, 'V', 1 };

		printerService.printBytes("EPSON-TM-T20II", cutP);
	
	}

}

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public class Main {
 
	public static void main(String[] args) {
 
		PrinterService printerService = new PrinterService();
		
		System.out.println(printerService.getPrinters());
				
		//print some stuff
		printerService.printString("EPSON-TM-T20II", "\n\n testing testing 1 2 3eeeee \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
 
		// cut that paper!
		byte[] cutP = new byte[] { 0x1d, 'V', 1 };
 
		printerService.printBytes("EPSON-TM-T20II", cutP);
	
	}
 
}