Java 无法打印特定打印机-jasper报告

我有两台打印机连接到我的PC COM端口3和4 名称：打印机_aa1、打印机_bb2

我想选择并按此打印机名称或任何索引（如0和1）打印jasper文档

我的代码仅从默认打印机打印。我不能选择任何打印机。 请帮我解决这个问题

多谢各位

public void printReciept_non(int printer) {

    String reportSource = "receipt_non.jrxml"; //sale_report_new

    Map<String, Object> parameter = new HashMap<String, Object>();
    parameter.put("total_amount", priceWithDecimal(totalAmount));
    parameter.put("order_code", lbl_orderNo.getText());
    parameter.put("table_no", tableNo);
    parameter.put("IS_IGNORE_PAGINATION", true);

    Locale locale = new Locale("en", "US");
    parameter.put(JRParameter.REPORT_LOCALE, locale);

    try {
        JasperReport js = JasperCompileManager.compileReport(reportSource);
        JasperPrint jp = JasperFillManager.fillReport(js, parameter, new check().getConn());

        JasperPrintManager.printReport(jp, false);

        PrinterJob printerJob = PrinterJob.getPrinterJob();
        PrintService[] services = PrintServiceLookup.lookupPrintServices(null, null);
        int selectedService = printer;
        PrintService[] printService = PrintServiceLookup.lookupPrintServices(null, null);

        try {
            printerJob.setPrintService(printService[selectedService]);
        } catch (Exception e) {
            System.out.println(e);
        }

        PrintRequestAttributeSet printRequestAttributeSet = new HashPrintRequestAttributeSet();
        printRequestAttributeSet.add(MediaSizeName.NA_LETTER);
        printRequestAttributeSet.add(new Copies(0));
        JRPrintServiceExporter exporter = new JRPrintServiceExporter();
        exporter.setParameter(JRExporterParameter.JASPER_PRINT, jp);

        exporter.setParameter(JRPrintServiceExporterParameter.PRINT_SERVICE, services[selectedService]);
        exporter.setParameter(JRPrintServiceExporterParameter.PRINT_SERVICE_ATTRIBUTE_SET, services[selectedService].getAttributes());
        exporter.setParameter(JRPrintServiceExporterParameter.PRINT_REQUEST_ATTRIBUTE_SET, printRequestAttributeSet);
        exporter.setParameter(JRPrintServiceExporterParameter.DISPLAY_PAGE_DIALOG, Boolean.FALSE);
        exporter.setParameter(JRPrintServiceExporterParameter.DISPLAY_PRINT_DIALOG, Boolean.FALSE);
        exporter.exportReport();

    } catch (Exception e) {
        System.out.println(e);
    }

}