获取所有活动的打印机

Question

The Printer-Api delivers an all printers of the system with Printer.getAllPrinters() .

The problem is that the user does not realize that the being selected printer is active.

Are there opportunities only to obtain the active printers?

Could help the PrinterAttributes ?

Answer 1

I am not sure about javaFX but you can achieve this using Java Print API's PrintService class.

   DocFlavor flavor = DocFlavor.INPUT_STREAM.POSTSCRIPT;
   PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
   aset.add(MediaSizeName.ISO_A4);
   PrintService[] pservices =
             PrintServiceLookup.lookupPrintServices(flavor, aset);

Now you can iterate through these services and use PrinterState and PrinterStateReason Classes to identify whether a print service is still available or not

For Example:

       PrinterState prnState = (PrinterState)service.getAttribute(
                                              PrinterState.class);
        if (prnState == PrinterState.STOPPED) {
            PrinterStateReasons prnStateReasons =
                (PrinterStateReasons)service.getAttribute(
                                             PrinterStateReasons.class);
            if ((prnStateReasons != null) &&
                (prnStateReasons.containsKey(PrinterStateReason.SHUTDOWN)))
            {
                throw new PrinterException("PrintService is no longer available.");
            }
        }

Hope this helps