VPF::Просмотр PDF в Swing-объекте - Форум программистов

LSD

Дата 2.6.2007, 22:00 (ссылка)

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Leprechaun Software Developer

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Цитата(Goganchic @ 2.6.2007, 22:18

)

почему за спасибо, есть такие проекты, в которых сам продукт - бесплатный, а поддержка к нему нет

Есть куча бесплатных проектов: во первых сама JDK чего стоит, сервера приложений (JBoss и Ко), куча бесплатных либ (Jakarta и т.п.). А есть и платные библиотеки. Такова жизнь smile

На этом оффтопик предлагаю закончить, тема все таки не об этом.

--------------------

Disclaimer: this post contains explicit depictions of personal opinion. So, if it sounds sarcastic, don't take it seriously. If it sounds dangerous, do not try this at home or at all. And if it offends you, just don't read it.

Goganchic

Дата 4.6.2007, 12:33 (ссылка)

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Опытный

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Хм, я вот думаю, а сложно ли такую библиотеку написать... smile

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узнай много нового о Linux в сообществе linux.vsevteme.ru

Metal_Heart

Дата 4.6.2007, 16:56 (ссылка)

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а почему бы и нет?

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Goganchic, а ты попробуй - сразу узнаешь smile

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не стыдно учиться, а стыдно не учиться

Goganchic

Дата 4.6.2007, 19:56 (ссылка)

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Опытный

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Metal_Heart, я в раздумии, вот поэтому и спрашиваю smile

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узнай много нового о Linux в сообществе linux.vsevteme.ru

ilia1234

Дата 4.6.2007, 21:11 (ссылка)

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Новичок

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Вот примерчик с использованием JPedal. Это их собственный пример, только слегка доработаннай, чтобы можно было документы напрямую из мссива байтов открывать. Например при считывании из базы данных.

Код


import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;

import javax.swing.Box;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JToolBar;

import org.jpedal.PdfDecoder;

/**
 * 
 * <p>A 'barebones' example of implementing a PDF display panel -
 * The SimpleViewer example shows all the bells and whistles built into JPedalScope:<b>(All)</b>
 * <P>
 */
public class PDFViewer extends JPanel
{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private PdfDecoder pdfDecoder;
    
    private byte[] currentFile = null;    
    private int currentPage=1;
    
    private final JLabel pageCounter1=new JLabel("Seite ");
    private JTextField pageCounter2=new JTextField(4);
    private JLabel pageCounter3=new JLabel("von");
    
    JToolBar topBar = new JToolBar();
            
    public PDFViewer(byte[] pdf)
    {    
        setCursor(new Cursor(Cursor.WAIT_CURSOR));
        currentFile = pdf;
        pdfDecoder = new PdfDecoder();        
        initializeViewer();
        
        selectFile();
        setCursor(Cursor.getDefaultCursor());
    }
    
    private void selectFile() 
    {    
        try
        {
            //close the current pdf before opening another
            pdfDecoder.closePdfFile();                
            pdfDecoder.openPdfArray(currentFile);
            
//            these 2 lines opens page 1 at 100% scaling
            pdfDecoder.decodePage(currentPage);
            pdfDecoder.setPageParameters((float)1.5,1); //values scaling (1=100%). page number
            pdfDecoder.invalidate();
            
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
        
        //set page number display
        pageCounter2.setText(currentPage+"");
        pageCounter3.setText("von "+pdfDecoder.getPageCount());
        repaint();
    }
    
    private void initializeViewer() 
    {        
        this.setLayout(new BorderLayout());
        
        Component[] itemsToAdd = initChangerPanel();//setup page display and changer
        
        topBar.setFloatable(false);
        topBar.add(Box.createGlue());
        
        for(int i=0;i<itemsToAdd.length;i++)
        {
            topBar.add(itemsToAdd[i]);
            topBar.addSeparator();
        }
        topBar.add(Box.createGlue());
        
        this.add(topBar,BorderLayout.PAGE_START);
        
        JScrollPane display = initPDFDisplay();//setup scrollpane with pdf display inside
        this.add(display,BorderLayout.CENTER);        
    }

    /**
     * returns the scrollpane with pdfDecoder set as the viewport
     */
    private JScrollPane initPDFDisplay() 
    {        
        JScrollPane currentScroll = new JScrollPane();
        currentScroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        currentScroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
        
        currentScroll.setViewportView(pdfDecoder);
        
        return currentScroll;
    }

    /**
     * setup the page display and changer panel and return it 
     */
    private Component[] initChangerPanel()
    {        
        Component[] list = new Component[5];
        
        /**back icon*/
        JButton back = new JButton("<<");
        back.setPreferredSize(new Dimension(20, 20));
        back.setMaximumSize(new Dimension(20, 20));
        back.setBorderPainted(false);
        back.setToolTipText("Rewind one page"); 
        list[0] = back;
        back.addActionListener(new ActionListener() 
        {
            public void actionPerformed(ActionEvent e) 
            {
                if(currentFile!=null && currentPage>1)
                {
                    currentPage -= 1;
                    try 
                    {
                        pdfDecoder.decodePage(currentPage);
                        pdfDecoder.invalidate();
                        repaint();
                    } 
                    catch (Exception e1) 
                    {
                        System.err.println("back 1 page");
                        e1.printStackTrace();
                    }
             
//             set page number display
                pageCounter2.setText(currentPage+"");
                }
            }
        });
        
        pageCounter2.setEditable(true);
        pageCounter2.addActionListener(new ActionListener()
        {            
            public void actionPerformed(ActionEvent a)
            {                
                String value=(String) pageCounter2.getText().trim();
                int newPage;
                
                //allow for bum values
                try
                {
                    newPage=Integer.parseInt(value);
                    
                    if((newPage>pdfDecoder.getPageCount())|(newPage<1))
                    {
                     return;
                    }
                    
                    currentPage=newPage;
                    try
                    {
                     pdfDecoder.decodePage(currentPage);
                     pdfDecoder.invalidate();
                        repaint();
                    }
                    catch(Exception e)
                    {
                     System.err.println("page number entered");
                     e.printStackTrace();
                    }
                    
                }
                catch(Exception e)
                {
                    JOptionPane.showMessageDialog(null,">"+value+ "< is Not a valid Value.\nPlease enter a number between 1 and "+pdfDecoder.getPageCount()); 
                    return;
                }
                
            }
            
        });
        
        /**put page count in middle of forward and back*/
        list[1] = pageCounter1;
        pageCounter1.setPreferredSize(new Dimension(50, 20));
        pageCounter1.setMaximumSize(new Dimension(50, 20));        
        list[2] = pageCounter2;   
        pageCounter2.setPreferredSize(new Dimension(50, 20));
        pageCounter2.setMaximumSize(new Dimension(50, 20));
        list[3] = pageCounter3;
        pageCounter3.setPreferredSize(new Dimension(50, 20));
        pageCounter3.setMaximumSize(new Dimension(50, 20));

        /**forward icon*/
        JButton forward = new JButton(">>");
        forward.setPreferredSize(new Dimension(20, 20));
        forward.setMaximumSize(new Dimension(20, 20));
        forward.setBorderPainted(false);        
        forward.setToolTipText("forward 1 page"); 
        list[4] = forward;
        forward.addActionListener(new ActionListener() 
        {
            public void actionPerformed(ActionEvent e) 
            {
                if(currentFile!=null && currentPage<pdfDecoder.getPageCount())
                {
                    currentPage += 1;
                    try {
                        pdfDecoder.decodePage(currentPage);
                        pdfDecoder.invalidate();
                        repaint();
                    } catch (Exception e1) {
                        System.err.println("forward 1 page");
                        e1.printStackTrace();
                    }
                    
    //                set page number display
                    pageCounter2.setText(currentPage+"");
                }
            }
        });
        
        return list;
    }
}

regen

Дата 5.6.2007, 19:04 (ссылка)

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Шустрый

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ilia1234, спасибо огромное! Просто огромное! Выручил!

Пример из мануала взял или сам написал? Просто я перерыл мануалы, а примера такого не видел...

ilia1234

Дата 5.6.2007, 19:29 (ссылка)

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Новичок

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Там моего процентов 10. Где взял уже не помню. Скорее всего на их сайте или на sourceforge.net.
Это исходный пример:

Код


/**
 * Created on 04-Mar-2005
 *
 * Simple demo to show JPedal being used as a simple GUI viewer.
 * 
 * represents the minimum needed to display a PDF page.
 * 
 */
package org.jpedal.examples.jpaneldemo;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JToolBar;
import javax.swing.WindowConstants;

import org.jpedal.PdfDecoder;
import org.jpedal.examples.simpleviewer.utils.FileFilterer;

/**
 * 
 * <p>A 'barebones' example of implementing a PDF display panel -
 * The SimpleViewer example shows all the bells and whistles built into JPedalScope:<b>(All)</b>
 * <P>
 */
public class JPanelDemo extends JFrame {
    
    private String viewerTitle="Jpanel Demo";
    
    /**the actual JPanel/decoder object*/
    private PdfDecoder pdfDecoder;
    
    /**name of current PDF file*/
    private String currentFile=null;
    
    /**current page number (first page is 1)*/
    private int currentPage=1;
    
    private final JLabel pageCounter1=new JLabel("Page ");
    private JTextField pageCounter2=new JTextField(4);//000 used to set prefered size
    private JLabel pageCounter3=new JLabel("of");//000 used to set prefered size
    
    /**
     * construct a pdf viewer, passing in the full file name
     */
    public JPanelDemo(String name){
        
        pdfDecoder = new PdfDecoder();
        
        currentFile = name;//store file name for use in page changer
        
        try{
            //this opens the PDF and reads its internal details
            pdfDecoder.openPdfFile(currentFile);
            
            //these 2 lines opens page 1 at 100% scaling
            pdfDecoder.decodePage(currentPage);
            pdfDecoder.setPageParameters(1,1); //values scaling (1=100%). page number
        }catch(Exception e){
            e.printStackTrace();
        }
        
        //setup our GUI display
        initializeViewer();
        
        //set page number display
        pageCounter2.setText(currentPage+"");
        pageCounter3.setText("of "+pdfDecoder.getPageCount());
    }
    
    /**
     * construct an empty pdf viewer and pop up the open window
     */
    public JPanelDemo(){
        
        setTitle(viewerTitle);
        
        pdfDecoder = new PdfDecoder();
        
        initializeViewer();
        
//        selectFile();
    }

    /**
     * opens a chooser and allows user to select a pdf file and opens it
     */
    private void selectFile() {
        
        JFileChooser open = new JFileChooser(".");
        open.setFileSelectionMode(JFileChooser.FILES_ONLY);
        
        String[] pdf = new String[] { "pdf" };
        open.addChoosableFileFilter(new FileFilterer(pdf,"Pdf (*.pdf)"));
        
        int resultOfFileSelect = JFileChooser.ERROR_OPTION;
        while(resultOfFileSelect==JFileChooser.ERROR_OPTION){
            
            resultOfFileSelect = open.showOpenDialog(this);
            
            if(resultOfFileSelect==JFileChooser.ERROR_OPTION)
                System.err.println("JFileChooser error");
            
            if(resultOfFileSelect==JFileChooser.APPROVE_OPTION){
                currentFile = open.getSelectedFile().getAbsolutePath();
                
                currentPage = 1;
                try{
                    //close the current pdf before opening another
                    pdfDecoder.closePdfFile();
                    
//                    this opens the PDF and reads its internal details
                    pdfDecoder.openPdfFile(currentFile);
                    
                    //check for password encription and acertain
                    if(!checkEncryption()){
                        //if file content is not accessable make user select a different file
                        resultOfFileSelect = JFileChooser.CANCEL_OPTION;
                    }
                    
//                    these 2 lines opens page 1 at 100% scaling
                    pdfDecoder.decodePage(currentPage);
                    pdfDecoder.setPageParameters(1,1); //values scaling (1=100%). page number
                    pdfDecoder.invalidate();
                    
                }catch(Exception e){
                    e.printStackTrace();
                }
                
                //set page number display
                pageCounter2.setText(currentPage+"");
                pageCounter3.setText("of "+pdfDecoder.getPageCount());
                
                setTitle(viewerTitle+" - "+currentFile);
                
                repaint();
            }
        }
    }

    /**
     * check if encryption present and acertain password, return true if content accessable
     */
    private boolean checkEncryption() {
        
//        check if file is encrypted
        if(pdfDecoder.isEncrypted()){
            
            //if file has a null password it will have been decoded and isFileViewable will return true
            while(!pdfDecoder.isFileViewable()) {
    
                /**<start-13>
                //<end-13>
                JOptionPane.showMessageDialog(this,"Please use Java 1.4 to display encrypted files");
                return false;//no other content can be displayed from this file
                //<start-13>
                 /**/
    
                /** popup window if password needed */
                String password = JOptionPane.showInputDialog(this,"Please enter password");
    
                /** try and reopen with new password */
                if (password != null) {
                    pdfDecoder.setEncryptionPassword(password);
                    pdfDecoder.verifyAccess();
    
                }
                //<end-13>
            }
            return true;
        }
        //if not encrypted return true
        return true;
    }

    /**
     * setup the viewer and its components
     */
    private void initializeViewer() {
        //<start-13>
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        //<end-13>
        
        Container cPane = getContentPane();
        cPane.setLayout(new BorderLayout());
        
        JButton open = initOpenBut();//setup open button
        Component[] itemsToAdd = initChangerPanel();//setup page display and changer
        
        JPanel topBar = new JPanel();
        topBar.setLayout(new FlowLayout(FlowLayout.LEADING,0,0));
        topBar.add(open);
//        topBar.add(pageChanger);
        for(int i=0;i<itemsToAdd.length;i++){
            topBar.add(itemsToAdd[i]);
        }
        
        cPane.add(topBar,BorderLayout.NORTH);
        
        JScrollPane display = initPDFDisplay();//setup scrollpane with pdf display inside
        cPane.add(display,BorderLayout.CENTER);
        
        pack();
        
        Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
        setSize(screen.width/2,screen.height/2);
        
        //<start-13>
        setLocationRelativeTo(null);//centre on screen
        //<end-13>
        setVisible(true);
    }
    
    /**
     * returns the open button with listener
     */
    private JButton initOpenBut() {
        
        JButton open = new JButton();
        open.setIcon(new ImageIcon(getClass().getResource("/org/jpedal/examples/simpleviewer/open.gif"))); //$NON-NLS-1$
        open.setText("Open");
        open.setToolTipText("Open a file"); 
        open.setBorderPainted(false);
        open.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                    selectFile();
            }
        });
        
        return open;
    }

    /**
     * returns the scrollpane with pdfDecoder set as the viewport
     */
    private JScrollPane initPDFDisplay() {
        
        JScrollPane currentScroll = new JScrollPane();
        currentScroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        currentScroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
        
        currentScroll.setViewportView(pdfDecoder);
        
        return currentScroll;
    }

    /**
     * setup the page display and changer panel and return it 
     */
    private Component[] initChangerPanel(){
        
        Component[] list = new Component[11];
        
        /**back to page 1*/
        JButton start = new JButton();
        start.setBorderPainted(false);
        URL startImage =getClass().getResource("/org/jpedal/examples/simpleviewer/start.gif"); 
        start.setIcon(new ImageIcon(startImage));
        start.setToolTipText("Rewind to page 1");
//        currentBar1.add(start);
        list[0] = start;
        start.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if(currentFile!=null && currentPage!=1){
                 currentPage = 1;
                 try {
                        pdfDecoder.decodePage(currentPage);
                        pdfDecoder.invalidate();
                        repaint();
                    } catch (Exception e1) {
                        System.err.println("back to page 1");
                        e1.printStackTrace();
                    }
                 
                 //set page number display
                    pageCounter2.setText(currentPage+"");
                }
            }
        });
        
        /**back 10 icon*/
        JButton fback = new JButton();
        fback.setBorderPainted(false);
        URL fbackImage =getClass().getResource("/org/jpedal/examples/simpleviewer/fback.gif");
        fback.setIcon(new ImageIcon(fbackImage));
        fback.setToolTipText("Rewind 10 pages");
//        currentBar1.add(fback);
        list[1] = fback;
        fback.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if(currentFile!=null && currentPage>10){
                    currentPage -= 10;
                 try {
                        pdfDecoder.decodePage(currentPage);
                        pdfDecoder.invalidate();
                        repaint();
                    } catch (Exception e1) {
                        System.err.println("back 10 pages");
                        e1.printStackTrace();
                    }
                 
//                 set page number display
                    pageCounter2.setText(currentPage+"");
                }
            }
        });
        
        /**back icon*/
        JButton back = new JButton();
        back.setBorderPainted(false);
        URL backImage =getClass().getResource("/org/jpedal/examples/simpleviewer/back.gif"); 
        back.setIcon(new ImageIcon(backImage));
        back.setToolTipText("Rewind one page"); 
//        currentBar1.add(back);
        list[2] = back;
        back.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            if(currentFile!=null && currentPage>1){
                currentPage -= 1;
             try {
                    pdfDecoder.decodePage(currentPage);
                    pdfDecoder.invalidate();
                    repaint();
                } catch (Exception e1) {
                    System.err.println("back 1 page");
                    e1.printStackTrace();
                }
             
//             set page number display
                pageCounter2.setText(currentPage+"");
            }
            }
        });
        
        pageCounter2.setEditable(true);
        pageCounter2.addActionListener(new ActionListener(){
            
            public void actionPerformed(ActionEvent a) {
                
                String value=(String) pageCounter2.getText().trim();
                int newPage;
                
                //allow for bum values
                try{
                    newPage=Integer.parseInt(value);
                    
                    if((newPage>pdfDecoder.getPageCount())|(newPage<1)){
                     return;
                    }
                    
                    currentPage=newPage;
                    try{
                     pdfDecoder.decodePage(currentPage);
                     pdfDecoder.invalidate();
                        repaint();
                    }catch(Exception e){
                     System.err.println("page number entered");
                     e.printStackTrace();
                    }
                    
                }catch(Exception e){
                    JOptionPane.showMessageDialog(null,">"+value+ "< is Not a valid Value.\nPlease enter a number between 1 and "+pdfDecoder.getPageCount()); 
                    return;
                }
                
            }
            
        });
        
        /**put page count in middle of forward and back*/
//        currentBar1.add(pageCounter1);
//        currentBar1.add(new JPanel());//add gap
//        currentBar1.add(pageCounter2);
//        currentBar1.add(new JPanel());//add gap
//        currentBar1.add(pageCounter3);
        list[3] = pageCounter1;
        list[4] = new JPanel();
        list[5] = pageCounter2;
        list[6] = new JPanel();
        list[7] = pageCounter3;

        /**forward icon*/
        JButton forward = new JButton();
        forward.setBorderPainted(false);
        URL fowardImage =getClass().getResource("/org/jpedal/examples/simpleviewer/forward.gif");
        forward.setIcon(new ImageIcon(fowardImage));
        forward.setToolTipText("forward 1 page"); 
//        currentBar1.add(forward);
        list[8] = forward;
        forward.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            if(currentFile!=null && currentPage<pdfDecoder.getPageCount()){
                currentPage += 1;
                try {
                    pdfDecoder.decodePage(currentPage);
                    pdfDecoder.invalidate();
                    repaint();
                } catch (Exception e1) {
                    System.err.println("forward 1 page");
                    e1.printStackTrace();
                }
                
//                set page number display
                pageCounter2.setText(currentPage+"");
            }
            }
        });
        
        /**fast forward icon*/
        JButton fforward = new JButton();
        fforward.setBorderPainted(false);
        URL ffowardImage =getClass().getResource("/org/jpedal/examples/simpleviewer/fforward.gif");
        fforward.setIcon(new ImageIcon(ffowardImage));
        fforward.setToolTipText("Fast forward 10 pages"); 
//        currentBar1.add(fforward);
        list[9] = fforward;
        fforward.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            if(currentFile!=null && currentPage<pdfDecoder.getPageCount()-9){
                currentPage += 10;
                try {
                    pdfDecoder.decodePage(currentPage);
                    pdfDecoder.invalidate();
                    repaint();
                } catch (Exception e1) {
                    System.err.println("forward 10 pages");
                    e1.printStackTrace();
                }
                
//                set page number display
                pageCounter2.setText(currentPage+"");
            }
            }
        });

        /**goto last page*/
        JButton end = new JButton();
        end.setBorderPainted(false);
        URL endImage =getClass().getResource("/org/jpedal/examples/simpleviewer/end.gif");
        end.setIcon(new ImageIcon(endImage));
        end.setToolTipText("Fast forward to last page");
//        currentBar1.add(end);
        list[10] = end;
        end.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            if(currentFile!=null && currentPage<pdfDecoder.getPageCount()){
                currentPage = pdfDecoder.getPageCount();
                try {
                    pdfDecoder.decodePage(currentPage);
                    pdfDecoder.invalidate();
                    repaint();
                } catch (Exception e1) {
                    System.err.println("forward to last page");
                    e1.printStackTrace();
                }
                
//                set page number display
                pageCounter2.setText(currentPage+"");
            }
            }
        });
        
        return list;
    }

    /**create a standalone program. User may pass in name of file as option*/
    public static void main(String[] args) {
        
        JPanelDemo current;
        
        /** Run the software */
        if (args.length > 0) {
            current = new JPanelDemo(args[0]);
        } else {
            current = new JPanelDemo();
        }
    }
}

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