问在热敏爱普生TM-T20II打印机上格式化收据

EN

private void btnPrintActionPerformed(java.awt.event.ActionEvent evt) { 

    PrinterService printerService = new PrinterService();
    System.out.println(printerService.getPrinters());
    byte[] left = new byte[]{0x1b, 0x61, 0x00};
    byte[] center = new byte[]{0x1b, 0x61, 0x01};
    byte[] right = new byte[]{0x1b, 0x61, 0x02};
    byte[] reset = new byte[]{0x1b, 0x40};
    printerService.printBytes("EPSON TM-T20II", center);
    printerService.printString("EPSON TM-T20II", 
            "\n\n PUMP FITNESS LIMITED"
            + "\n Address : 52763 NAIROBI"
            + "\n Tel : 0714183897"
            + "\n***********************************************"
            + "\n CASH SALE [ORIGINAL]");
    printerService.printString("EPSON TM-T20II","\n++");
    printerServiceprintBytes("EPSON TM-T20II", reset);
    printerService.printBytes("EPSON TM-T20II", left);
    printerService.printString("EPSON TM-T20II","\n RCT No.: " + sTrID);
    printerService.printString("EPSON TM-T20II","++");
    printerService.printBytes("EPSON TM-T20II", reset);
    printerService.printBytes("EPSON TM-T20II", right);
    printerService.printString("EPSON TM-T20II",
            "Date : " + sTrDt + "\n Time : " + sTrTm);
    printerService.printString("EPSON TM-T20II","\n++");
    printerService.printBytes("EPSON TM-T20II", reset);
    printerService.printBytes("EPSON TM-T20II", left);
    printerService.printString("EPSON TM-T20II", 
            "\n Client No.: " + sID
            + "\n Received from : " + sClNm
            + "\n DESCRIPTION            QTY           AMT(Ksh)"
            + "\n***********************************************"
            + "\n " + sPSNm + "" + sQty + "" +  sPSPrice
            + "\n Discount" + sDisc
            + "\n***********************************************"
            + "\n Total" + sNAmt
            + "\n Tendered Amount" + sCash
            + "\n Change" + sBal
            + "\n***********************************************"
            + "\n Pmt Mode : " + sPmtMode + "Cash Pnt:" + sCPNm
            + "\n Cashier : " + sUNm + "Shift No.: " + sShiftNo
            + "\n Powered By Pump Fitness Ltd."
            + "\n\n\n\n\n");
    // cut that paper!
    byte[] cutP = new byte[] { 0x1d, 'V', 1 };
    printerService.printBytes("EPSON TM-T20II", cutP);
}