w3hJava

Java is such a big language now, that we ofter need to handle all type of application with Java. You may end up with a situation where you want to call MS word from Java, or Open Document from Java. Now, months back, I got a situation where I need to call some PDF formats from Java and need to do some operation on its pages. At that time, I have explored the Project - PDF Renderer on java.net site. Its an awesome project and cool operations.

A complete viewer and render. API’s are strong and I have just check this code from site itself. This code put the first page of your PDF file inside PagePanel. No doubt PDF is one of the open format used worldwide across all OS. In such a case, support from Java is something like adding more flavor in sweet.

import com.sun.pdfview.PDFFile;
import com.sun.pdfview.PDFPage;
import com.sun.pdfview.PagePanel;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import javax.swing.*;

/**
 * An example of using the PagePanel class to show PDFs. For more advanced
 * usage including navigation and zooming, look ad the
 * com.sun.pdfview.PDFViewer class.
 *
 * -AT-author joshua.marinacci@sun-DOT-com
 */
public class Main {

    public static void setup() throws IOException {

        //set up the frame and panel
        JFrame frame = new JFrame("PDF Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        PagePanel panel = new PagePanel();
        frame.add(panel);
        frame.pack();
        frame.setVisible(true);

        //load a pdf from a byte buffer
        File file = new File("Amityform.pdf");
        RandomAccessFile raf = new RandomAccessFile(file, "r");
        FileChannel channel = raf.getChannel();
        ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY,
            0, channel.size());
        PDFFile pdffile = new PDFFile(buf);

        // show the first page
        PDFPage page = pdffile.getPage(0);
        panel.showPage(page);

    }

    public static void main(final String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                try {?
                    Main.setup();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        });
    }
}

Just download the jar file from project site. And then :

javac -cp PDFRenderer.jar Main.java

java -cp PDFRenderer.jar;. Main

It is pretty fast as well, because IO operation has been done by NIO and channels are superb.  Thanks guys for making such a great project.

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