PrinterJob自订纸张问题

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public class TestPrint {
  
  final static double PAPER_WIDTH = 504;   final static double PAPER_HEIGHT = 325.944;
  final static String PRINTERNAME = "US_RECEIPT"; //印表机名称
  
  private int PrinterIndex;
  private PrintService[] printservice = java.awt.print.PrinterJob.lookupPrintServices();   public static void main(String[] args) {
    TestPrint tp = new TestPrint();
    tp.print();
 
  }   
  public void print() {
    for (int i=0;i<printservice.length;i++) {
      if (printservice[i].getName().equals(PRINTERNAME))
        PrinterIndex = i ;
    }
    
    PrinterJob pjob = PrinterJob.getPrinterJob();
    
    PageFormat pf = new PageFormat();
   Paper pp = new Paper();    pp.setSize(PAPER_WIDTH, PAPER_HEIGHT);
      pp.setImageableArea(0, 0, PAPER_WIDTH, PAPER_HEIGHT);
   pf.setPaper(pp);
    
    PrintPage p1 = new PrintPage();
    try {
      pjob.setPrintService(printservice[PrinterIndex]);
    } catch (PrinterException ex) {
      ex.printStackTrace();
      return;
    }
    pjob.setPrintable(p1,pf);
    pjob.setCopies(1);
    try {
      pjob.print();
    }
    catch(Exception ex) {
      ex.printStackTrace();     System.exit(0);
    }
  }
  class PrintPage implements Printable {
    public int print(Graphics g, PageFormat pf, int pageIndex) {
      if(pageIndex > 0)
        return NO_SUCH_PAGE;
      Graphics2D g2d = (Graphics2D) g;
      g2d.translate(pf.getImageableX(), pf.getImageableY());
      
      g2d.drawString(String.valueOf(pf.getImageableWidth()), 10, 10);
      g2d.drawString(String.valueOf(pf.getImageableHeight()), 10, 120);
      g2d.drawString(String.valueOf(pf.getWidth()), 130, 20);
      g2d.drawString(String.valueOf(pf.getHeight()), 130, 130);
      
      return PAGE_EXISTS;
    }
  }
 
}