如何在不选择java打印机的情况下打印

我试图用以下代码打印JPanel：

try {
    PrinterJob gap = PrinterJob.getPrinterJob();
    gap.setPrintable(this);
    boolean top = gap.printDialog();

    if(top){
        gap.print();

    }

} catch (PrinterException ex) {
    JOptionPane.showMessageDialog(null, " ERROR DEL PROGRAMA", "ERROR \n " + ex , JOptionPane.INFORMATION_MESSAGE);
}

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但是，选择打印机时会出现配置菜单。我不希望选择打印机，我希望它是从默认打印机打印的，或者在代码中选择打印机。

如果您不想显示打印对话框，请删除“gap.printDialog（）”，您只需要使用“gap.print（）”

你可以这样做：

PrinterJob gap = PrinterJob.getPrinterJob();
PageFormat pf = gap.defaultPage();

//Manually assign some of the basic print settings (More advanced things may require you to write your own code)
gap.setJobName("My Print Jnb");

//Set custom page size?
Paper paper = new Paper();
paper.setSize(595, 842);
pf.setPaper(paper);

//Set page orientation?
pf.setOrientation(PageFormat.LANDSCAPE);

//Create the print job with our manual settings
gap.setPrintable(this, pf);

try
{
    //And finally print it out
    gap.print();
}
catch (PrinterException e)
{
    JOptionPane.showMessageDialog(null, " ERROR DEL PROGRAMA", "ERROR \n " + ex , JOptionPane.INFORMATION_MESSAGE);
}

编辑：如果要手动选择打印机，请查看以下问题：

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