ActionListener listener = new MyListener();
        butt.addActionListener(listener);

在我的监听器中添加此

if (Desktop.isDesktopSupported()) {
            try {
                File myFile = new File( "path/to/file");
                Desktop.getDesktop().open(myFile);
            } catch (IOException ex) {
                // no application registered for PDFs
            }
        }