2018년 9월 1일 토요일

[Java] PDF Reader and Writer using PDFBox




1. PDF Reader Examples (PDFBox)

 - PDF Image Extract
 - PDF Pages to Image Converter
 - PDF Stamp


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import java.awt.Color;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.imageio.ImageIO;

import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.PDPageTree;
import org.apache.pdfbox.pdmodel.PDPageContentStream.AppendMode;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.encryption.InvalidPasswordException;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType0Font;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.graphics.PDXObject;
import org.apache.pdfbox.pdmodel.graphics.form.PDFormXObject;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
import org.apache.pdfbox.rendering.ImageType;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.tools.imageio.ImageIOUtil;

public class PdfBoxTools {

    PDDocument document;
    
    public PdfBoxTools() {
    }
    
    public void load(String fileName) throws InvalidPasswordException, IOException {
        document = PDDocument.load(new File(fileName));
    }
    
    public void save(String fileName) {
        try {
            this.document.save(fileName);
            this.document.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }   
    
    public void close() throws IOException {
        document.close();
    }

    public PDFont loadFont(String fontFile) {
        PDFont font = PDType1Font.HELVETICA_BOLD; 
        if( new File(fontFile).exists() ) {
            try {
                return PDType0Font.load(document, new File(fontFile));
            } catch (IOException e) {
            }
        }
        return font;
    }
        
    private int convY(PDPage page, int y) {
        return (int)page.getMediaBox().getHeight() - y - 1;
    }
        
    public PDPage newPage() throws IOException {
        PDPage page = new PDPage(PDRectangle.A4);
        document.addPage( page );
        return page;
    }   
    
    public int getPageWidth(PDPage page) {
        return (int) page.getMediaBox().getWidth();
    }
    
    public int getPageHeight(PDPage page) {
        return (int) page.getMediaBox().getHeight();
    }

    public String pageInfo() {
        PDPageTree pages = this.document.getDocumentCatalog().getPages();
        //pages.get(0);
        //this.document.getPage(0);
        //this.document.getPages();
        return "Number of Pages: " + pages.getCount();
    }
    
    //------------------------------------------------------------
    // 1. PDF Elements
    //------------------------------------------------------------
    
    //------------------------------------------------------------
    // 1.1 Text  
    //------------------------------------------------------------

    public int getTextWidth( String text, PDFont font, int fontSize ) {
        try {
            return (int)((font.getStringWidth(text)/1000)*fontSize);
        } catch (IOException e) {
            e.printStackTrace();
            return 0;
        }
    }
    
    public void drawText( PDPage page, int x, int y, String text, Color color, Color bgColor, PDFont font, int fontSize ) throws IOException {
        if( font == null ) {
            font = PDType1Font.HELVETICA;
        }
        y += fontSize * 1.5;
        if( bgColor != null ) {
            int width = getTextWidth(text, font, fontSize);
            drawRect( page, new Rectangle(x,y+3,width,fontSize), bgColor, true );
        }
        PDPageContentStream stream = new PDPageContentStream( this.document, page, AppendMode.APPEND, true );
        stream.beginText();
        stream.setFont(font, fontSize);
        stream.setNonStrokingColor( color.getRed(), color.getGreen(), color.getBlue());
        stream.newLineAtOffset( x, convY(page,y) );
        stream.showText(text);
        stream.endText(); 
        stream.close();
    }
    
    public void drawText( PDPage page, int x, int y, String text, Color color ) throws IOException {
        drawText( page, x, y, text, color, null, PDType1Font.HELVETICA_BOLD, 12);
    }
    
    //------------------------------------------------------------
    // 1.2 Image  
    //------------------------------------------------------------

    public int drawImage( PDPage page, int x, int y, PDImageXObject image ) throws IOException {
        PDPageContentStream stream = new PDPageContentStream( this.document, page, AppendMode.APPEND, true );
        stream.drawImage(image, x, convY(page,y+image.getHeight()+12));
        stream.close();
        return image.getHeight()+12;
    }
    
    
    public int drawImage( PDPage page, int x, int y, String fileName ) throws IOException {
        PDImageXObject image = PDImageXObject.createFromFile(fileName, this.document);
        return drawImage( page, x, y, image);
    }

    
    //------------------------------------------------------------
    // 1.3 Polygons  
    //------------------------------------------------------------

    public void drawLine( PDPage page, int x1, int y1, int x2, int y2, int width, Color color ) throws IOException {
        PDPageContentStream stream = new PDPageContentStream( this.document, page, AppendMode.APPEND, true );
        stream.setLineWidth(width);
        stream.setStrokingColor( color.getRed(), color.getGreen(), color.getBlue());
        stream.moveTo( x1, convY(page, y1) );
        stream.lineTo( x2, convY(page, y2) );
        stream.stroke();
        stream.close();
    }

    public void drawRect( PDPage page, Rectangle rect, Color color, boolean fill) throws IOException {
        PDPageContentStream stream = new PDPageContentStream( this.document, page, AppendMode.APPEND, true );
        stream.addRect(rect.x, convY(page,(int)rect.y), rect.width, rect.height);
        if (fill) {
            stream.setNonStrokingColor(color);
            stream.fill();
        } else {
            stream.setStrokingColor(color);
            stream.stroke();
        }
        stream.close();
    }
    
    //------------------------------------------------------------
    // 2. PDF Stamp
    //------------------------------------------------------------

    public void stampTextAllPages(int x, int y, String text, Color color, Color bgColor) throws IOException {
        PDFont font = loadFont("malgunbd.ttf");
        int fontSize = 12;
        for( PDPage page : this.document.getPages() ) {         
            drawText( page, x, y, text, color, bgColor, font, fontSize );
        }
    }
    
    //------------------------------------------------------------
    // 3. PDF Image Extract
    //------------------------------------------------------------
    public void extractImagesToPng(File folder) throws IOException {
        if( folder.exists() == false ) {
            folder.mkdirs();
        }
        List<RenderedImage> images = getAllImages();
        for( int i = 0; i < images.size(); i++ ) {
            ImageIO.write( images.get(i), "png", 
                new File(folder, String.format( "image_%04d.png", i)));
        }
    }
    
    public void extractImagesToJpeg(File folder) throws IOException {
        if( folder.exists() == false ) {
            folder.mkdirs();
        }
        List<RenderedImage> images = getAllImages();
        for( int i = 0; i < images.size(); i++ ) {
            ImageIO.write( images.get(i), "jpeg", 
                new File(folder, String.format( "image_%04d.jpg", i)));
        }
    }
    
    public List<RenderedImage> getAllImages() throws IOException {
        List<RenderedImage> images = new ArrayList<>();
        for( PDPage page : document.getPages() ) {
            images.addAll(getImagesFromResources(page.getResources()));
        }
        return images;
    }
    
    private List<RenderedImage> getImagesFromResources(PDResources resources) throws IOException {
        List<RenderedImage> images = new ArrayList<>();
        for( COSName name : resources.getXObjectNames() ) {
            PDXObject obj = resources.getXObject(name);
            if (obj instanceof PDFormXObject) {
                images.addAll(getImagesFromResources(((PDFormXObject) obj).getResources()));
            } else if (obj instanceof PDImageXObject) {
                images.add(((PDImageXObject) obj).getImage());
            }
        }
        return images;
    }

    //------------------------------------------------------------
    // 4. PDF To Image Converter
    //------------------------------------------------------------
    public void convertPagesToPng(File folder) throws IOException {
        if( folder.exists() == false ) {
            folder.mkdirs();
        }
        PDFRenderer pdfRenderer = new PDFRenderer(document);
        for( int page = 0; page < document.getNumberOfPages(); page++ ) { 
            BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);   
            ImageIOUtil.writeImage( bim, 
                String.format( folder + "/image_%04d.png", page), 300);
        }
    }
    
    public void convertPagesToJpeg(File folder) throws IOException {
        if( folder.exists() == false ) {
            folder.mkdirs();
        }
        PDFRenderer pdfRenderer = new PDFRenderer(document);
        for( int page = 0; page < document.getNumberOfPages(); page++ ) { 
            BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);   
            ImageIOUtil.writeImage( bim, 
                String.format( folder + "/image_%04d.jpg", page), 300);
        }
    }

    //------------------------------------------------------------
    // 5. Examples
    //------------------------------------------------------------

    public static void imageExtractTest() throws IOException {
        PdfBoxTools pdf = new PdfBoxTools();
        pdf.load("D:/Ebook/python.pdf");
        pdf.extractImagesToPng(new File("D:/Temp/png"));
        pdf.extractImagesToJpeg(new File("D:/Temp/jpg"));
    }
    
    public static void imageConvertTest() throws IOException {
        PdfBoxTools pdf = new PdfBoxTools();
        pdf.load("D:/Ebook/python.pdf");
        pdf.convertPagesToPng(new File("D:/Temp/page_png"));
        pdf.convertPagesToJpeg(new File("D:/Temp/page_jpg"));
    }
        
    public static void textStamp() throws IOException {
        PdfBoxTools pdf = new PdfBoxTools();
        pdf.load("D:/document.pdf");
        pdf.stampTextAllPages(20,20,"[Confidential]",Color.RED,Color.YELLOW);
        pdf.save("D:/stamp.pdf");
    }
    
    public static void main(String[] args) throws IOException {
        System.out.println("Begin !");
        imageExtractTest();
        imageConvertTest();
        textStamp();        
        System.out.println("End !");
    }
}



2. PDF Writer Examples

 - PDF Print Text
 - PDF Print Image
 - PDF Print Line
 - PDF Print and Fill Rectangle


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import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.imageio.ImageIO;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;

import ij.IJ;
import ij.ImagePlus;
import ij.process.ImageProcessor;

public class PdfBoxPrinter extends PdfBoxTools {

    PDPage currPage;

    PDFont font;
    PDFont boldFont;
    int fontSize;

    PDRectangle pageSize;
    int topMargin;
    int bottomMargin;
    int leftMargin;
    int rightMargin;
    int currY;
    
    public PdfBoxPrinter() throws IOException {
        document = new PDDocument();

        font = PDType1Font.HELVETICA; 
        boldFont = PDType1Font.HELVETICA_BOLD; 
        fontSize = 14;

        topMargin = 72;
        bottomMargin = 72;
        leftMargin = 36;
        rightMargin = 36;

        currPage = newPage();
        currY = getTopMargin();
    }

    public void loadNormalFont(String fileName) {
        font = loadFont(fileName);
    }
    
    public void loadBoldFont(String fileName) {
        boldFont = loadFont(fileName);
    }
    
    //------------------------------------------------------------
    // 1. Pages
    //------------------------------------------------------------
    
    public int getPageContentWidth() {
        return (int)(getPageWidth(currPage) - getLeftMargin() - getRightMargin());
    }

    public int getLeftMargin() {
        return this.leftMargin;
    }

    public int getRightMargin() {
        return this.rightMargin;
    }
    
    public int getTopMargin() {
        return this.topMargin;
    }
    
    public int getBottomMargin() {
        return this.bottomMargin;
    }
    
    
    //------------------------------------------------------------
    // 2. Text Print
    //------------------------------------------------------------
    
    public void printText(String text, Color color, Color bgColor, PDFont textFont, int fontSize) throws IOException {
        List<String> lines = new ArrayList<String>();
        int width = getPageContentWidth();
        int lastSpace = -1;
        while( text.length() > 0 ) {
            int spaceIndex = text.indexOf(' ', lastSpace + 1);
            if (spaceIndex < 0) {
                spaceIndex = text.length();
            }
            String subString = text.substring(0, spaceIndex);
            float size = this.fontSize * textFont.getStringWidth(subString) / 1000;
            if( size > width ) {
                if( lastSpace < 0 ) {
                    lastSpace = spaceIndex;
                }
                subString = text.substring(0, lastSpace);
                lines.add(subString);
                text = text.substring(lastSpace).trim();
                lastSpace = -1;
            } else if( spaceIndex == text.length() ) {
                lines.add(text);
                text = "";
            } else {
                lastSpace = spaceIndex;
            }
        }

        for (String line: lines) {
            drawText( currPage, getLeftMargin(), currY, line, color, bgColor, textFont, fontSize );
            currY += this.fontSize * 1.5;
        }
    }
    
    public void printText(String text) throws IOException {     
        printText(text, Color.BLACK, null, font, fontSize );
    }
    
    public void printTextBold(String text) throws IOException {     
        printText(text, Color.BLACK, null, boldFont, fontSize );
    }

    public void printText(String text, Color color) throws IOException {        
        printText(text, color, null, font, fontSize );
    }

    public void printTextBold(String text, Color color) throws IOException {        
        printText(text, color, null, boldFont, fontSize );
    }
    
    //------------------------------------------------------------
    // 2. Text Images
    //------------------------------------------------------------
    
    public void printImage( String fileName ) throws IOException {
        ImagePlus imagePlus = IJ.openImage(fileName);
        ImageProcessor imageProc = imagePlus.getProcessor();
        int w = imageProc.getWidth();
        int h = imageProc.getHeight();
        int pageWidth = getPageContentWidth();
        if( w > pageWidth ) {
            imageProc = imageProc.resize( pageWidth, h * pageWidth / w);
        }
        BufferedImage bimage = imageProc.getBufferedImage();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write( bimage, "jpg", baos );
        baos.flush();
        byte[] imageInByte = baos.toByteArray();
        baos.close();
        
        PDImageXObject image = PDImageXObject.createFromByteArray( document, imageInByte, null);
        currY +=  drawImage( currPage, getLeftMargin(), currY, image );
    }
    
    //------------------------------------------------------------
    // 3. Text Polygons
    //------------------------------------------------------------
    
    public void printLine() throws IOException {
        drawLine( currPage, getLeftMargin(), currY, 
                getPageWidth(currPage)-getRightMargin(), currY, 1, Color.BLACK );
    }

    //------------------------------------------------------------
    // 4. Examples
    //------------------------------------------------------------
    
    public static void createPdfDocument() throws IOException {
        String s = "I am trying to create a PDF file with a lot of text contents in the document. I am using PDFBox";
        PdfBoxPrinter pdf = new PdfBoxPrinter();
        pdf.loadNormalFont("malgun.ttf");
        pdf.loadBoldFont("malgunbd.ttf");
        pdf.printLine();
        pdf.printText(s);
        pdf.printImage("D:/image.png");
        pdf.printTextBold(s);
        pdf.printText(s, Color.RED);
        pdf.printTextBold(s, Color.BLUE);
        pdf.printText(" ");
        pdf.printLine();
        pdf.save("D:/document.pdf");
    }

    public static void main(String[] args) throws IOException {
        System.out.println("Begin !");
        createPdfDocument();
        System.out.println("End !");
    }
}

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