textareaprintingdemo.java

java tutorial.sun公司官方出品。java入门书籍。最新版

/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

package misc;

/*
 * TextAreaPrintingDemo.java requires the following files:
 * toprint.txt
 * guide.txt
 * images/print.png
 */

import java.awt.print.PrinterException;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.swing.*;
import java.text.MessageFormat;
import javax.xml.transform.Source;


public class TextAreaPrintingDemo extends javax.swing.JFrame {
    
    public TextAreaPrintingDemo() {
        initComponents();
        load(text, "toprint.txt");
        load(guideText, "guide.txt");
    }
    
    /** 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.
     */
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">//GEN-BEGIN:initComponents
    private void initComponents() {
        jScrollPane1 = new javax.swing.JScrollPane();
        text = new javax.swing.JTextArea();
        headerLabel = new javax.swing.JLabel();
        headerField = new javax.swing.JTextField();
        footerLabel = new javax.swing.JLabel();
        footerField = new javax.swing.JTextField();
        interactiveCheck = new javax.swing.JCheckBox();
        printButton = new javax.swing.JButton();
        guideText = new javax.swing.JTextArea();
        backgroundCheck = new javax.swing.JCheckBox();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("TextAreaPrintingDemo");
        text.setColumns(20);
        text.setRows(5);
	text.setMargin(new java.awt.Insets(2, 2, 2, 2));
        jScrollPane1.setViewportView(text);

        headerLabel.setText("Header");

        headerField.setText("William Shakespeare");

        footerLabel.setText("Footer");

        footerField.setText("Page {0}");

        interactiveCheck.setSelected(true);
        interactiveCheck.setText("Show Progress Dialog");
        interactiveCheck.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));

        printButton.setIcon(new javax.swing.ImageIcon(getClass().getResource("images/print.png")));
        printButton.setText("Print!");
        printButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                print(evt);
            }
        });

        guideText.setColumns(20);
        guideText.setEditable(false);
        guideText.setLineWrap(true);
        guideText.setRows(5);
        guideText.setWrapStyleWord(true);
        guideText.setOpaque(false);

        backgroundCheck.setSelected(true);
        backgroundCheck.setText("Print in Background");
        backgroundCheck.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(guideText)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(backgroundCheck, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(interactiveCheck, javax.swing.GroupLayout.PREFERRED_SIZE, 159, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(printButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                            .addComponent(footerLabel, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(headerLabel, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(footerField)
                            .addComponent(headerField, javax.swing.GroupLayout.PREFERRED_SIZE, 209, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addGap(15, 15, 15)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 343, Short.MAX_VALUE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 403, Short.MAX_VALUE)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(guideText, javax.swing.GroupLayout.DEFAULT_SIZE, 260, Short.MAX_VALUE)
                        .addGap(18, 18, 18)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(headerLabel)
                            .addComponent(headerField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(footerLabel)
                            .addComponent(footerField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(27, 27, 27)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(interactiveCheck, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(backgroundCheck, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addComponent(printButton, javax.swing.GroupLayout.PREFERRED_SIZE, 52, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addContainerGap())
        );
        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void load(JTextArea comp, String fileName) {
        try {
            comp.read(
                new InputStreamReader(
                    getClass().getResourceAsStream(fileName)),
                null);
        } catch (IOException ex) {
            // should never happen with the resources we provide
            ex.printStackTrace();
        }
    }
    
    private void print(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_print
        MessageFormat header = createFormat(headerField);
        MessageFormat footer = createFormat(footerField);
        boolean interactive = interactiveCheck.isSelected();
        boolean background = backgroundCheck.isSelected();

        PrintingTask task = new PrintingTask(header, footer, interactive);
        if (background) {
            task.execute();
        } else {
            task.run();
        }
    }//GEN-LAST:event_print
    
    private class PrintingTask extends SwingWorker<Object, Object> {
        private final MessageFormat headerFormat;
        private final MessageFormat footerFormat;
        private final boolean interactive;
        private volatile boolean complete = false;
        private volatile String message;
        
        public PrintingTask(MessageFormat header, MessageFormat footer,
                            boolean interactive) {
            this.headerFormat = header;
            this.footerFormat = footer;
            this.interactive = interactive;
        }
        
        @Override
        protected Object doInBackground() {
            try {
                complete = text.print(headerFormat, footerFormat,
                        true, null, null, interactive);
                message = "Printing " + (complete ? "complete" : "canceled");
            } catch (PrinterException ex) {
                message = "Sorry, a printer error occurred";
            } catch (SecurityException ex) {
                message =
                    "Sorry, cannot access the printer due to security reasons";
            }
            return null;
        }
        
        @Override
        protected void done() {
            message(!complete, message);
        }
    }
    
    private MessageFormat createFormat(JTextField source) {
        String text = source.getText();
        if (text != null && text.length() > 0) {
            try {
                return new MessageFormat(text);
            } catch (IllegalArgumentException e) {
                error("Sorry, this format is invalid.");
            }
        }
        return null;
    }
    
    private void message(boolean error, String msg) {
        int type = (error ? JOptionPane.ERROR_MESSAGE :
                            JOptionPane.INFORMATION_MESSAGE);
        JOptionPane.showMessageDialog(this, msg, "Printing", type);
    }
    
    private void error(String msg) {
        message(true, msg);
    }

    public static void createAndShowGUI() {
        JFrame f = new TextAreaPrintingDemo();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
    
    public static void main(String args[]) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                //Turn off metal's use of bold fonts
                UIManager.put("swing.boldMetal", Boolean.FALSE);
		createAndShowGUI();
            }
        });
    }
    
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JCheckBox backgroundCheck;
    private javax.swing.JTextField footerField;
    private javax.swing.JLabel footerLabel;
    private javax.swing.JTextArea guideText;
    private javax.swing.JTextField headerField;
    private javax.swing.JLabel headerLabel;
    private javax.swing.JCheckBox interactiveCheck;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JButton printButton;
    private javax.swing.JTextArea text;
    // End of variables declaration//GEN-END:variables
}