.txt中的Java收据文件

Question

I'm creating a program which will print a .txt receipt of the bought items from the store and it prints successfully, but I need to change the font of some specific part of the text is it possible? for example I wanted to print something like this

THIS SHOULD BE BOLD and BIGGER

this should be smaller than the first line

This should be italicized

would it be possible?

UPDATE

here is the code of the printing process

    public static void main(String[] args) throws PrintException, IOException {
    String defaultPrinter =PrintServiceLookup.lookupDefaultPrintService().getName();
    System.out.println("Default printer: " + defaultPrinter);

    PrintService service = PrintServiceLookup.lookupDefaultPrintService();

    FileInputStream in = new FileInputStream(new File("sample.txt"));

    PrintRequestAttributeSet  pras = new HashPrintRequestAttributeSet();
    pras.add(new Copies(1));


    DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
    Doc doc = new SimpleDoc(in, flavor, null);

    DocPrintJob job = service.createPrintJob();
    PrintJobWatcher pjw = new PrintJobWatcher(job);
    job.print(doc, pras);
    pjw.waitForDone();
    in.close();

    // send FF to eject the page
    InputStream ff = new ByteArrayInputStream("\f".getBytes());
    Doc docff = new SimpleDoc(ff, flavor, null);
    DocPrintJob jobff = service.createPrintJob();
    pjw = new PrintJobWatcher(jobff);
    jobff.print(docff, null);
    pjw.waitForDone();
  }
}

class PrintJobWatcher {
  boolean done = false;

  PrintJobWatcher(DocPrintJob job) {
    job.addPrintJobListener(new PrintJobAdapter() {
      public void printJobCanceled(PrintJobEvent pje) {
        allDone();
      }
      public void printJobCompleted(PrintJobEvent pje) {
        allDone();
      }
      public void printJobFailed(PrintJobEvent pje) {
        allDone();
      }
      public void printJobNoMoreEvents(PrintJobEvent pje) {
        allDone();
      }
      void allDone() {
        synchronized (PrintJobWatcher.this) {
          done = true;
          System.out.println("Printing done ...");
          PrintJobWatcher.this.notify();
        }
      }
    });
  }
  public synchronized void waitForDone() {
    try {
      while (!done) {
        wait();
      }
    } catch (InterruptedException e) {
    }
  }

Answer 1

Example for Bold (assuming that your printer has the same escape sequences as in the code you linked to).

public static final char ESC =  27;
public static final String BOLD_ON = ESC + "E";
public static final String BOLD_OFF = ESC + "F";

String textString = "some text";
String toPrintInBold = BOLD_ON + textString + BOLD_OFF;

Now toPrintInBold is ready to be set to the printer.

If it works, then you have a method and just need more control codes.