打印，预览程序

import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.Properties; import java.awt.font.FontRenderContext; import java.awt.print.*; import javax.print.*; import javax.print.attribute.*; import java.io.*; public class PrintTest extends JFrame implements ActionListener, Printable { private JButton printTextButton = new JButton("Print Text"); private JButton previewButton = new JButton("Print Preview"); private JButton printText2Button = new JButton("Print Text2"); private JButton printFileButton = new JButton("Print File"); private JButton printFrameButton = new JButton("Print Frame"); private JButton exitButton = new JButton("Exit"); private JLabel tipLabel = new JLabel(""); private JTextArea area = new JTextArea(); private JScrollPane scroll = new JScrollPane(area); private JPanel buttonPanel = new JPanel(); private int PAGES = 0; private String printStr; public PrintTest() { this.setTitle("Print Test"); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setBounds(50, 50, 800, 600); initLayout(); } private void initLayout() { this.getContentPane().setLayout(new BorderLayout()); this.getContentPane().add(scroll, BorderLayout.CENTER); printTextButton.setMnemonic('P'); printTextButton.addActionListener(this); buttonPanel.add(printTextButton); previewButton.setMnemonic('v'); previewButton.addActionListener(this); buttonPanel.add(previewButton); printText2Button.setMnemonic('e'); printText2Button.addActionListener(this); buttonPanel.add(printText2Button); printFileButton.setMnemonic('i'); printFileButton.addActionListener(this); buttonPanel.add(printFileButton); printFrameButton.setMnemonic('F'); printFrameButton.addActionListener(this); buttonPanel.add(printFrameButton); exitButton.setMnemonic('x'); exitButton.addActionListener(this); buttonPanel.add(exitButton); this.getContentPane().add(buttonPanel, BorderLayout.SOUTH); } public void actionPerformed(ActionEvent evt) { Object src = evt.getSource(); if (src == printTextButton) printTextAction(); else if (src == previewButton) previewAction(); else if (src == printText2Button) printText2Action(); else if (src == printFileButton) printFileAction(); else if (src == printFrameButton) printFrameAction(); else if (src == exitButton) exitApp(); } public int print(Graphics g, PageFormat pf, int page) throws PrinterException { Graphics2D g2 = (Graphics2D)g; g2.setPaint(Color.black); if (page >= PAGES) return Printable.NO_SUCH_PAGE; g2.translate(pf.getImageableX(), pf.getImageableY()); drawCurrentPageText(g2, pf, page); return Printable.PAGE_EXISTS; } private void drawCurrentPageText(Graphics2D g2, PageFormat pf, int page) { Font f = area.getFont(); String s = getDrawText(printStr)[page]; String drawText; float ascent = 16; int k, i = f.getSize(), lines = 0; while(s.length() > 0 && lines < 54) { k = s.indexOf('\n'); if (k != -1) { lines += 1; drawText = s.substring(0, k); g2.drawString(drawText, 0, ascent); if (s.substring(k + 1).length() > 0) { s = s.substring(k + 1); ascent += i; } } else { lines += 1; drawText = s; g2.drawString(drawText, 0, ascent); s = ""; } } } public String[] getDrawText(String s) { String[] drawText = new String[PAGES]; for (int i = 0; i < PAGES; i++) drawText[i] = ""; int k, suffix = 0, lines = 0; while(s.length() > 0) { if(lines < 54) { k = s.indexOf('\n'); if (k != -1) { lines += 1; drawText[suffix] = drawText[suffix] + s.substring(0, k + 1); if (s.substring(k + 1).length() > 0) s = s.substring(k + 1); } else { lines += 1; drawText[suffix] = drawText[suffix] + s; s = ""; } } else { lines = 0; suffix++; } } return drawText; } public int getPagesCount(String curStr) { int page = 0; int position, count = 0; String str = curStr; while(str.length() > 0) { position = str.indexOf('\n'); count += 1; if (position != -1) str = str.substring(position + 1); else str = ""; } if (count > 0) page = count / 54 + 1; return page; } private void printTextAction() { printStr = area.getText().trim(); if (printStr != null && printStr.length() > 0) { PAGES = getPagesCount(printStr); PrinterJob myPrtJob = PrinterJob.getPrinterJob(); PageFormat pageFormat = myPrtJob.defaultPage(); myPrtJob.setPrintable(this, pageFormat); if (myPrtJob.printDialog()) { try { myPrtJob.print(); } catch(PrinterException pe) { pe.printStackTrace(); } } } else { JOptionPane.showConfirmDialog(null, "Sorry, Printer Job is Empty, Print Cancelled!", "Empty" , JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE); } } private void previewAction() { printStr = area.getText().trim(); PAGES = getPagesCount(printStr); (new PrintPreviewDialog(this, "Print Preview", true, this, printStr)).setVisible(true); } private void printText2Action() { printStr = area.getText().trim(); if (printStr != null && printStr.length() > 0) { PAGES = getPagesCount(printStr); DocFlavor flavor = DocFlavor.SERVICE_FORMATTED.PRINTABLE; PrintService printService = PrintServiceLookup.lookupDefaultPrintService(); DocPrintJob job = printService.createPrintJob(); PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet(); DocAttributeSet das = new HashDocAttributeSet(); Doc doc = new SimpleDoc(this, flavor, das); try { job.print(doc, pras); } catch(PrintException pe) { pe.printStackTrace(); } } else { JOptionPane.showConfirmDialog(null, "Sorry, Printer Job is Empty, Print Cancelled!", "Empty" , JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE); } } private void printFileAction() {/* //JFileChooser fileChooser = new JFileChooser(SystemProperties.USER_DIR); // fileChooser.setFileFilter(new com.szallcom.file.JavaFilter()); int state = fileChooser.showOpenDialog(this); if (state == fileCho