打印带有可滚动 Jtable 的 JPanel [英] Printing a JPanel with Scrollable Jtable On it

问题描述

我只想打印一个 JPanel，上面有一个可滚动的 JTable.

I just want to print a JPanel which has a scrollable JTable on it.

我已经用 JTable 定位了 JPanel.但我只能打印可见区域.

I have oriented JPanel with JTable on it. But I can print only visible area.

不打印可滚动JTable区域的内容.

The contents in scrollable JTable area are not printed.

推荐答案

我建议使用 Jasper Reports 之类的东西是有原因的，这花了两天的大部分时间来解决.JTable 不喜欢被这样对待.

There is a reason why I suggest using something like Jasper Reports, this has taken the better part of two days to nut out. JTable doesn't like been treated this way.

基本上，有在屏幕上显示数据的UI 视图"和用于生成打印输出的打印视图".

Basically, there is the "UI view", which shows the data on the screen and the "print view" which used to generate the print out.

用户界面视图...

打印视图...

这个例子，在 A4 纸上，将生成 22 页...

This example, on A4 paper, will generate 22 pages...

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.DialogTypeSelection;
import javax.print.attribute.standard.Media;
import javax.print.attribute.standard.MediaSizeName;
import javax.print.attribute.standard.PrinterResolution;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableModel;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            DefaultTableModel model = new DefaultTableModel();
            int columnCount = 10;
            for (int index = 0; index < columnCount; index++) {
                model.addColumn((char) ('A' + index));
            }
            for (int row = 0; row < 1000; row++) {
                Object[] data = new Object[columnCount];
                for (int col = 0; col < columnCount; col++) {
                    data[col] = row + "x" + col;
                }
                model.addRow(data);
            }

            setLayout(new BorderLayout());
            JTable table = new JTable(model);
            add(new JScrollPane(table));
            JButton print = new JButton("Print");
            add(print, BorderLayout.SOUTH);
            print.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    try {
                        PrintPane printPane = new PrintPane(model);

                        PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
                        aset.add(MediaSizeName.ISO_A4);
                        aset.add(new PrinterResolution(300, 300, PrinterResolution.DPI));
                        aset.add(DialogTypeSelection.NATIVE);

                        PrinterJob pj = PrinterJob.getPrinterJob();
                        pj.setPrintable(printPane);

                        PageFormat pf = pj.defaultPage();
                        pf.setOrientation(PageFormat.LANDSCAPE);

                        if (pj.printDialog(aset)) {
                            try {
                                pj.print(aset);
                            } catch (PrinterException ex) {
                                ex.printStackTrace();
                            }
                        }
                    } catch (IOException ex) {
                        ex.printStackTrace();
                    }

                }
            });
        }

    }

    public class PrintPane extends JPanel implements Printable {

        private JTable table;

        public PrintPane(TableModel model) throws IOException {
            setLayout(new GridBagLayout());
            BufferedImage logo = ImageIO.read(...);
            JLabel header = new JLabel("Honest Bob's Used Ponys", new ImageIcon(logo), JLabel.LEFT);
            header.setFont(header.getFont().deriveFont(Font.BOLD, 24f));
            header.setVerticalAlignment(JLabel.TOP);

            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.weightx = 1;
            gbc.gridwidth = GridBagConstraints.REMAINDER;
            gbc.fill = GridBagConstraints.HORIZONTAL;

            add(header, gbc);

            table = new JTable(model);
            JTableHeader tableHeader = table.getTableHeader();
            gbc.gridy++;
            add(tableHeader, gbc);

            gbc.gridy++;
            gbc.fill = GridBagConstraints.BOTH;
            add(new JTable(model), gbc);
            setBackground(Color.WHITE);
        }

        private int lastPage = 0;
        private double yOffset;

        @Override
        public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
            int result = NO_SUCH_PAGE;

            String name = "I be mighty!";
            String page = Integer.toString(pageIndex);

            double height = pageFormat.getImageableHeight();
            double width = pageFormat.getImageableWidth();

            System.out.println("Page = " + width + "x" + height);

            JTableHeader tableHeader = table.getTableHeader();
            Dimension size = tableHeader.getPreferredSize();
            tableHeader.setPreferredSize(new Dimension((int) width, size.height));
            tableHeader.setSize(table.getPreferredSize());

            size = table.getPreferredSize();
            table.setPreferredSize(new Dimension((int) width, size.height));
            table.setSize(table.getPreferredSize());

            size = getPreferredSize();
            setSize((int)width, size.height);
            invalidate();
            doLayout();

            table.doLayout();
            tableHeader.doLayout();

            if (lastPage != pageIndex) {
                lastPage = pageIndex;
                yOffset = height * pageIndex;
                if (yOffset > getHeight()) {
                    yOffset = -1;
                }
            }

            if (yOffset >= 0) {
                Graphics2D g2d = (Graphics2D) graphics.create();

                g2d.translate((int) pageFormat.getImageableX(),
                        (int) pageFormat.getImageableY());

                g2d.translate(0, -yOffset);
                printAll(g2d);

                g2d.dispose();

                result = PAGE_EXISTS;
                System.out.println("Print page " + pageIndex);
            }
            return result;
        }

    }
}

有一个重要的问题，即一行可能被分成两页.这将要求您能够计算适合页面的行数并相应地剪辑 Graphics，但我会让您自己弄清楚

There is one significant problem, the fact that a row might be split over two pages. This would require you to be able to calculate the number of rows which would fit onto the page and clip the Graphics accordingly, but I'll leave that to you to figure out

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