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所以我正在尝试制作一个我想打印收据的计费系统。我可以使用我在网上找到的一些代码来完成它，但是字体太大而无法在 58 毫米宽的纸上打印。我我无法调整字体大小。非常感谢您对此问题的任何帮助。谢谢。

这是代码：

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;
    }
}

@FXML
public void printit(ActionEvent actionEvent)
{
    PrinterService printerService = new PrinterService();

    System.out.println(printerService.getPrinters());

    //print some stuff
    printerService.printString("POS-58-Series", area.getText());
}
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