http://docs.oracle.com/javase/7/docs/api/javax/print/PrintService.html

Lista las impresoras disponibles:

import java.awt.print.PrinterJob;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;

public class GetPrinters {
public static void main(String[] args) {
PrintService[] services = PrinterJob.lookupPrintServices();
if (services.length > 0) {
for (int i = 0; i < services.length; i++) {
PrintService service = services[i];
System.out.println(service.getName());
}
}

System.out.println("default: "
+ PrintServiceLookup.lookupDefaultPrintService().getName());
}
}