在java中打印2页的jframe
我想打印一个包含大量文本字段和包含数据的按钮的jframe。 我想通过单击打印jbutton打印此jframe。 我试过这段代码。
protected void print() { PrinterJob job = PrinterJob.getPrinterJob(); if(job.printDialog()){ try { job.setPrintable(new Printable() { @Override public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException { if(pageIndex == 0){ Graphics2D g2d = (Graphics2D)graphics; g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY()); Dimension dim = ODietListJFrame.this.getSize(); double cHeight = dim.getHeight(); double cWidth = dim.getWidth(); // get the bounds of the printable area double pHeight = pageFormat.getImageableHeight(); double pWidth = pageFormat.getImageableWidth(); double xRatio = pWidth / cWidth; double yRatio = pHeight / cHeight; g2d.scale(xRatio, yRatio); ODietListJFrame.this.printAll(g2d); return PAGE_EXISTS; } return NO_SUCH_PAGE; } }); job.print(); } catch (PrinterException e) { e.printStackTrace(); } } else { System.err.println("Error printing"); } }
我的问题是我的jframe太大了，必须打印两页，这段代码打印第二页。 我想从jframe打印第一部分。
感谢帮助。
因此，我们需要做的第一件事是确保打印的组件符合它的首选尺寸……
component.setSize(component.getPreferredSize());
这很重要，但请记住，这会影响屏幕上的组件……
接下来，我们需要确定是否要打印新页面或重新打印当前页面。 发生这种情况是因为对于给定页面可能多次调用print …
if (lastPage != pageIndex) { lastPage = pageIndex; //... }
然后我们需要计算适合当前页面的组件的y偏移量…
yOffset = height * pageIndex; if (yOffset > component.getHeight()) { yOffset = -1; }
如果yOffset大于component高度，那么我们不想再打印任何页面。
接下来，我们打印页面，为此，我们需要翻译Graphics上下文，以便yOffset成为新的0位置…
g2d.translate(0, -yOffset);
然后我们打印组件……
component.printAll(g2d);
例如…
import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Rectangle; 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.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(new File("Get your own image")); } 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; public MultiPagePrintable(JComponent component) { this.component = component; } @Override public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException { int result = NO_SUCH_PAGE; double height = pageFormat.getImageableHeight(); 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; g2d.translate((int) pageFormat.getImageableX(), (int) pageFormat.getImageableY()); g2d.translate(0, -yOffset); component.printAll(g2d); result = PAGE_EXISTS; } return result; } } }
现在，这个例子只在垂直方向打印，如果你需要打印水平方向，它会变得有点复杂，但基本概念保持不变