如何在java swing中的每个页面中用页脚打印整个JPanel [英] How to print whole JPanel with a footer in every page in java swing
本文介绍了如何在java swing中的每个页面中用页脚打印整个JPanel的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
好吧，这可能很简单。但无法弄明白。
我有一个包含JTable的JPanel。 JTable包含很少的行，有时甚至更多，因为我推入的表模型取决于数据库。
但是，我不使用任何包含JTable的JScollpane。因此，当JTable包含越来越多的行时，父JPanel会自动调整其高度。这很好。
问题是我想一次打印整个JPanel。可能需要几页，我不在乎。我可以使用页眉和页脚直接打印JTable。但在我的情况下，JPanel包含一些重要组件，如JLable。因此，没有其他方法可以避免打印JPanel。
我搜索了几个在线链接，无处不在我找到了实现可打印界面的建议。
所以我在我的课程中实现了可打印并重载打印....
@Override
public int print（Graphics arg0，PageFormat arg1，int arg2）抛出PrinterException {
Graphics2D g2d =（Graphics2D）arg0;
g2d.translate（（int）arg1.getImageableX（），（int）arg1.getImageableY（））;
float pageWidth =（float）arg1.getImageableWidth（）;
float pageHeight =（float）arg1.getImageableHeight（）;
float imageHeight =（float）paintPanel.getHeight（）;
float imageWidth =（float）paintPanel.getWidth（）;
float scaleFactor = Math.min（（float）pageWidth /（float）imageWidth，（float）pageHeight /（float）imageHeight）;
int scaledWidth =（int）（（（float）imageWidth）* scaleFactor）;
int scaledHeight =（int）（（（float）imageHeight）* scaleFactor）;
BufferedImage canvas = new BufferedImage（paintPanel.getWidth（），paintPanel.getHeight（），BufferedImage.TYPE_INT_RGB）;
Graphics2D gg = canvas.createGraphics（）;
paintPanel.paint（gg）;
Image img = canvas;
g2d.drawImage（img，0,0，scaledWidth，scaledHeight，null）;
返回Printable.PAGE_EXISTS;
}
它无效。
另一个问题是我的第二个问题。我想在每个页面中放置一个页脚JPanel。那怎么可能呢。
请帮帮我。谢谢。
解决方案
所以基于
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import static java.awt.print.Printable.NO_SUCH_PAGE;
import static java.awt.print.Printable.PAGE_EXISTS;
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.MediaSizeName;
import javax.print.attribute.standard.PrinterResolution;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.Scrollable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
公共类PrintMe {
public static void main（String [] args）{
new PrintMe（）;
}
public PrintMe（）{
EventQueue.invokeLater（new Runnable（）{
@Override
public void run（）{
try {
UIManager.setLookAndFeel（UIManager.getSystemLookAndFeelClassName（））;
} catch（ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex）{
ex.printStackTrace（）;
}
TestPane testPane = new TestPane（）;
JButton btn = new JButton（Print）;
btn.addActionListener（new ActionListener（）{
@Override
public void actionPerformed（ActionEvent e）{
PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet（）;
aset.add（MediaSizeName.ISO_A4）;
aset.add（new打印机分辨率（300,300，PrinterResolution.DPI））;
PrinterJob pj = PrinterJob.getPrinterJob（）;
pj.setPrintable（new MultiPagePrintable（testPane））;
if（pj.printDialog（aset））{
try {
pj.print（aset）;
testPane.getParent（）。invalidate（）;
testPane.getParent（）。validate（）;
} catch（PrinterException ex）{
ex.printStackTrace（）;
}
}
}
}）;
JFrame frame = new JFrame（Testing）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
frame.add（new JScrollPane（testPane））;
frame.add（btn，BorderLayout.SOUTH）;
frame.pack（）;
frame.setLocationRelativeTo（null）;
frame.setVisible（true）;
}
}）;
}
公共类TestPane扩展JPanel实现Scrollable {
private BufferedImage img;
public TestPane（）{
try {
img = ImageIO.read（some image source）;
} catch（IOException ex）{
ex.printStackTrace（）;
}
}
@Override
public Dimension getPreferredSize（）{
return img == null？ new Dimension（200,200）：new Dimension（img.getWidth（），img.getHeight（））;
}
@Override
protected void paintComponent（Graphics g）{
super.paintComponent（g）;
if（img！= null）{
Graphics2D g2d =（Graphics2D）g.create（）;
int x =（getWidth（） - img.getWidth（））/ 2;
int y =（getHeight（） - img.getHeight（））/ 2;
g2d.drawImage（img，x，y，this）;
g2d.dispose（）;
}
}
@Override
public Dimension getPreferredScrollableViewportSize（）{
return new Dimension（200,200）;
}
@Override
public int getScrollableUnitIncrement（Rectangle visibleRect，int orientation，int direction）{
return 128;
}
@Override
public int getScrollableBlockIncrement（Rectangle visibleRect，int orientation，int direction）{
return 128;
}
@Override
public boolean getScrollableTracksViewportWidth（）{
return false;
}
@Override
public boolean getScrollableTracksViewportHeight（）{
return false;
}
}
公共类MultiPagePrintable实现Printable {
私有JComponent组件;
private int lastPage = 0;
private double yOffset;
private Font footerFont;
public MultiPagePrintable（JComponent component）{
this.component = component;
footerFont = new Font（Arial，Font.BOLD，24）;
}
@Override
public int print（图形图形，PageFormat pageFormat，int pageIndex）抛出PrinterException {
int result = NO_SUCH_PAGE;
字符串名称=我是强大的！;
String page = Integer.toString（pageIndex）;
FontMetrics fm = graphics.getFontMetrics（footerFont）;
double footerHeight = fm.getHeight（）+ 4;
double height = pageFormat.getImageableHeight（） - footerHeight;
component.setSize（component.getPreferredSize（））;
if（lastPage！= pageIndex）{
lastPage = pageIndex;
yOffset = height * pageIndex;
if（yOffset> component.getHeight（））{
yOffset = -1;
}
}
if（yOffset> = 0）{
Graphics2D g2d =（Graphics2D）graphics.create（）;
g2d.translate（（int）pageFormat.getImageableX（），
（int）pageFormat.getImageableY（））;
g2d.translate（0，-yOffset）;
component.printAll（g2d）;
g2d.translate（0，+ yOffset）;
Shape footerArea = new Rectangle2D.Double（0，height，pageFormat.getImageableWidth（），footerHeight）;
g2d.setColor（Color.WHITE）;
g2d.fill（footerArea）;
g2d.setColor（Color.RED）;
g2d.draw（footerArea）;
g2d.setColor（Color.BLACK）;
g2d.translate（0，（pageFormat.getImageableHeight（） - footerHeight））;
浮动x = 2;
float y =（float）（（footerHeight - fm.getHeight（））/ 2d）;
g2d.drawString（name，x，y + fm.getAscent（））;
x =（float）（pageFormat.getImageableWidth（） - fm.stringWidth（page） - 2）;
g2d.drawString（page，x，y + fm.getAscent（））;
g2d.dispose（）;
result = PAGE_EXISTS;
}
返回结果;
}
}
}
Ok it may simple. But can't figure it out.
I have a JPanel that contains a JTable. JTable contains few rows, Sometime more, because the table model i push into it depends on database.
However, i don't use any JScollpane that enclose my JTable. As a result, when JTable contains more and more row, parent JPanel automatically resized its height. That is working fine.
Problem is i want to print whole JPanel at a time. may be it needs several page, i don't care. I can print JTable directly with a header and footer. But in my case JPanel contains some important component like JLable. So, there is no other way to avoid printing of JPanel.
I search several online link, everywhere i found a suggestion to implements printable interface.
so i implements printable in my class and overload print....
@Override
public int print(Graphics arg0, PageFormat arg1, int arg2) throws PrinterException {
Graphics2D g2d = (Graphics2D) arg0;
g2d.translate((int) arg1.getImageableX(), (int) arg1.getImageableY());
float pageWidth = (float) arg1.getImageableWidth();
float pageHeight = (float) arg1.getImageableHeight();
float imageHeight = (float) paintPanel.getHeight();
float imageWidth = (float) paintPanel.getWidth();
float scaleFactor = Math.min((float) pageWidth / (float) imageWidth, (float) pageHeight / (float) imageHeight);
int scaledWidth = (int) (((float) imageWidth) * scaleFactor);
int scaledHeight = (int) (((float) imageHeight) * scaleFactor);
BufferedImage canvas = new BufferedImage(paintPanel.getWidth(), paintPanel.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D gg = canvas.createGraphics();
paintPanel.paint(gg);
Image img = canvas;
g2d.drawImage(img, 0, 0, scaledWidth, scaledHeight, null);
return Printable.PAGE_EXISTS;
}
Its not working.
Another problem that is my second problem. I want to place a footer JPanel in every page. So how could it possible.
Help me please. Thanks.
解决方案
So based on this example which demonstrates how to print a component across multiple pages, I modified it to allow for the printing of a footer.
This example draws directly via the Graphics context, but conceptually, the process would be simple enough to paint using a supplied JComponent of some sort.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import static java.awt.print.Printable.NO_SUCH_PAGE;
import static java.awt.print.Printable.PAGE_EXISTS;
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.MediaSizeName;
import javax.print.attribute.standard.PrinterResolution;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.Scrollable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class PrintMe {
public static void main(String[] args) {
new PrintMe();
}
public PrintMe() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
TestPane testPane = new TestPane();
JButton btn = new JButton("Print");
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
aset.add(MediaSizeName.ISO_A4);
aset.add(new PrinterResolution(300, 300, PrinterResolution.DPI));
PrinterJob pj = PrinterJob.getPrinterJob();
pj.setPrintable(new MultiPagePrintable(testPane));
if (pj.printDialog(aset)) {
try {
pj.print(aset);
testPane.getParent().invalidate();
testPane.getParent().validate();
} catch (PrinterException ex) {
ex.printStackTrace();
}
}
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(testPane));
frame.add(btn, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel implements Scrollable {
private BufferedImage img;
public TestPane() {
try {
img = ImageIO.read(some image source);
} catch (IOException ex) {
ex.printStackTrace();
}
}
@Override
public Dimension getPreferredSize() {
return img == null ? new Dimension(200, 200) : new Dimension(img.getWidth(), img.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (img != null) {
Graphics2D g2d = (Graphics2D) g.create();
int x = (getWidth() - img.getWidth()) / 2;
int y = (getHeight() - img.getHeight()) / 2;
g2d.drawImage(img, x, y, this);
g2d.dispose();
}
}
@Override
public Dimension getPreferredScrollableViewportSize() {
return new Dimension(200, 200);
}
@Override
public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) {
return 128;
}
@Override
public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) {
return 128;
}
@Override
public boolean getScrollableTracksViewportWidth() {
return false;
}
@Override
public boolean getScrollableTracksViewportHeight() {
return false;
}
}
public class MultiPagePrintable implements Printable {
private JComponent component;
private int lastPage = 0;
private double yOffset;
private Font footerFont;
public MultiPagePrintable(JComponent component) {
this.component = component;
footerFont = new Font("Arial", Font.BOLD, 24);
}
@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);
FontMetrics fm = graphics.getFontMetrics(footerFont);
double footerHeight = fm.getHeight() + 4;
double height = pageFormat.getImageableHeight() - footerHeight;
component.setSize(component.getPreferredSize());
if (lastPage != pageIndex) {
lastPage = pageIndex;
yOffset = height * pageIndex;
if (yOffset > component.getHeight()) {
yOffset = -1;
}
}
if (yOffset >= 0) {
Graphics2D g2d = (Graphics2D) graphics.create();
g2d.translate((int) pageFormat.getImageableX(),
(int) pageFormat.getImageableY());
g2d.translate(0, -yOffset);
component.printAll(g2d);
g2d.translate(0, +yOffset);
Shape footerArea = new Rectangle2D.Double(0, height, pageFormat.getImageableWidth(), footerHeight);
g2d.setColor(Color.WHITE);
g2d.fill(footerArea);
g2d.setColor(Color.RED);
g2d.draw(footerArea);
g2d.setColor(Color.BLACK);
g2d.translate(0, (pageFormat.getImageableHeight() - footerHeight));
float x = 2;
float y = (float)((footerHeight - fm.getHeight()) / 2d);
g2d.drawString(name, x, y + fm.getAscent());
x = (float)(pageFormat.getImageableWidth() - fm.stringWidth(page) - 2);
g2d.drawString(page, x, y + fm.getAscent());
g2d.dispose();
result = PAGE_EXISTS;
}
return result;
}
}
}
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