java - 如何打印 Java 书籍？

Question

很难说出这里问的是什么。这个问题是含糊的、模糊的、不完整的、过于宽泛的或修辞性的，无法以目前的形式得到合理的回答。如需帮助澄清此问题以便重新打开它， visit the help center 。

已关闭 11 年前。

下面代码的问题是它不打印 bk (Java Book)，而只打印“g”，即用户界面窗口。

有人可以解释一下如何打印 Java 书吗？

public class printInvoice extends javax.swing.JFrame implements Printable {

    JFrame frameToPrint;


        /** Creates new form SimplePrint */
        public void SimplePrint(JFrame f) {
            frameToPrint = f;

        }

        /** Creates new form NewJFrame */
        public printInvoice() {
            initComponents();
            this.setVisible(true);

            print2();

        }

        /** This method is called from within the constructor to
         * initialize the form.
         * WARNING: Do NOT modify this code. The content of this method is
         * always regenerated by the Form Editor.
         */
        @SuppressWarnings("unchecked")


        private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        }                                        

        /**
         * @param args the command line arguments
         */
        public static void main(String args[]) {
            java.awt.EventQueue.invokeLater(new Runnable() {

                public void run() {
                    new printInvoice().setVisible(true);
                }
            });
        }

        public int print(Graphics g, PageFormat pageFormat, int pageIndex) throws PrinterException {
            if (pageIndex > 0) {
                return (NO_SUCH_PAGE);
            } else {
                Graphics2D g2d = (Graphics2D) g;
                g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
                // Turn off double buffering
                //componentToBePrinted.paint(g2d);
                //frameToPrint.print(g);
                    paint(g);
                  //  this.print(g);

                 //  this.print(g);

                // Turn double buffering back on
                return (PAGE_EXISTS);
            }
        }


        // Variables declaration - do not modify                     
        private javax.swing.JButton jButton1;
        private javax.swing.JComboBox jComboBox1;
        private javax.swing.JLabel jLabel1;
        private javax.swing.JList jList1;
        private javax.swing.JRadioButton jRadioButton1;
        private javax.swing.JScrollPane jScrollPane1;
        // End of variables declaration                   
        int userCountAmount;
        dataBase data = new dataBase();
        Book bk = new Book();
        PrinterJob PJ = PrinterJob.getPrinterJob();


        public void print2() {
            userCountAmount = data.getAmountOfUsers();

            PageFormat portrait = PJ.defaultPage();

            portrait.setOrientation(PageFormat.PORTRAIT);


                jLabel1.setText("Print number: "+0);
                bk.append((Printable) this, PJ.defaultPage(),1);
                jLabel1.setText("Print number: "+1);
                bk.append((Printable) this, PJ.defaultPage(),2);
                jLabel1.setText("Print number: "+2);
                bk.append((Printable) this, PJ.defaultPage(),3);
    System.out.println(bk.toString());

            //PageFormat PF   =   PJ.pageDialog(PJ.defaultPage());
            PJ.setPageable(bk);

         //    PJ.setPrintable((Printable) this);
            boolean doPrint = PJ.printDialog();
            //JOptionPane.showMessageDialog(null, doPrint);
            if (doPrint) {
                try {

                        PJ.print();

                } catch (PrinterException ex) {
                    JOptionPane.showMessageDialog(null, ex.getMessage());
                }
            }
        }
}

Answer 1

打印书籍时，打印机作业正在使用 print(Graphics g, PageFormat pageFormat, int pageIndex)。您的 print 方法调用 paint(g)，这是 UI 框架的方法。

如果您不想打印 UI 控件的图像，则应使用 print 方法的 g 将所需图像绘制到页面。

编辑:示例，将文本绘制到页面中间(未测试):

public int print(Graphics g, PageFormat pageFormat, int pageIndex) throws PrinterException {
    Graphics2D g2d = (Graphics2D) g;

    double x1 = pf.getImageableX();
    double y1 = pf.getImageableY();
    double x2 = pf.getImageableWidth();
    double y2 = pf.getImageableHeight();    

    g2d.drawString( "Page #" + pageIndex, (int)((x2-x1)/2+x1), (int)((y2-y1)/2+y1) );

    return (PAGE_EXISTS);
}

顺便说一句:

如果您想打印多页，则需要更改代码中的以下位置:

    if (pageIndex > 0) {
        return (NO_SUCH_PAGE);