Notes d'étude itext7 - Chapitre 3 Pratique et exemple

Others 2020-10-28 02:43:07 views: null

    Pour les exemples de ce chapitre, veuillez vous référer au billet de blog que j'ai traduit: itext7 study notes-Chapter 3 , qui contient une explication détaillée.Si vous ne comprenez pas, vous pouvez commenter ou m'envoyer un message privé!

Exemple 1: Rédaction d'un quotidien

    La page est divisée en trois colonnes, puis ajoutez du texte et des images, le code est le suivant:

import com.itextpdf.io.font.FontConstants;
import com.itextpdf.io.image.ImageDataFactory;
import com.itextpdf.kernel.color.Color;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.*;
import com.itextpdf.layout.ColumnDocumentRenderer;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.*;


import java.io.*;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;

/**
 * Simple column renderer example.
 */
public class C03E01_NewYorkTimes {

    public static final String DEST = "results/chapter03/new_york_times.pdf";

    public static final String APPLE_IMG = "src/main/resources/img/ny_times_apple.jpg";
    public static final String APPLE_TXT = "src/main/resources/data/ny_times_apple.txt";
    public static final String FACEBOOK_IMG = "src/main/resources/img/ny_times_fb.jpg";
    public static final String FACEBOOK_TXT = "src/main/resources/data/ny_times_fb.txt";
    public static final String INST_IMG = "src/main/resources/img/ny_times_inst.jpg";
    public static final String INST_TXT = "src/main/resources/data/ny_times_inst.txt";

    static PdfFont timesNewRoman = null;
    static PdfFont timesNewRomanBold = null;

    public static void main(String[] args) throws Exception {
        timesNewRoman = PdfFontFactory.createFont(FontConstants.TIMES_ROMAN);
        timesNewRomanBold = PdfFontFactory.createFont(FontConstants.TIMES_BOLD);
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new C03E01_NewYorkTimes().createPdf(DEST);
    }

    protected void createPdf(String dest) throws Exception {

        //Initialize PDF document
        PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
        PageSize ps = PageSize.A5;

        // Initialize document
        Document document = new Document(pdf, ps);

        //Set column parameters
        float offSet = 36;
        float columnWidth = (ps.getWidth() - offSet * 2 + 10) / 3;
        float columnHeight = ps.getHeight() - offSet * 2;

        //Define column areas
        Rectangle[] columns = {new Rectangle(offSet - 5, offSet, columnWidth, columnHeight),
                new Rectangle(offSet + columnWidth, offSet, columnWidth, columnHeight),
                new Rectangle(offSet + columnWidth * 2 + 5, offSet, columnWidth, columnHeight)};
        document.setRenderer(new ColumnDocumentRenderer(document, columns));

        Image apple = new Image(ImageDataFactory.create(APPLE_IMG)).setWidth(columnWidth);
        String articleApple = new String(Files.readAllBytes(Paths.get(APPLE_TXT)), StandardCharsets.UTF_8);
        C03E01_NewYorkTimes.addArticle(document, "Apple Encryption Engineers, if Ordered to Unlock iPhone, Might Resist", "By JOHN MARKOFF MARCH 18, 2016", apple, articleApple);
        Image facebook = new Image(ImageDataFactory.create(FACEBOOK_IMG)).setWidth(columnWidth);
        String articleFB = new String(Files.readAllBytes(Paths.get(FACEBOOK_TXT)), StandardCharsets.UTF_8);
        C03E01_NewYorkTimes.addArticle(document, "With \"Smog Jog\" Through Beijing, Zuckerberg Stirs Debate on Air Pollution", "By PAUL MOZUR MARCH 18, 2016", facebook, articleFB);
        Image inst = new Image(ImageDataFactory.create(INST_IMG)).setWidth(columnWidth);
        String articleInstagram = new String(Files.readAllBytes(Paths.get(INST_TXT)), StandardCharsets.UTF_8);
        C03E01_NewYorkTimes.addArticle(document, "Instagram May Change Your Feed, Personalizing It With an Algorithm","By MIKE ISAAC MARCH 15, 2016", inst, articleInstagram);

        document.close();

    }

    public static void addArticle(Document doc, String title, String author, Image img, String text) throws IOException {
        Paragraph p1 = new Paragraph(title)
                .setFont(timesNewRomanBold)
                .setFontSize(14);
        doc.add(p1);
        doc.add(img);
        Paragraph p2 = new Paragraph()
                .setFont(timesNewRoman)
                .setFontSize(7)
                .setFontColor(Color.GRAY)
                .add(author);
        doc.add(p2);
        Paragraph p3 = new Paragraph()
                .setFont(timesNewRoman)
                .setFontSize(10)
                .add(text);
        doc.add(p3);
    }
}

Exemple 2: Différentes tables

    Dessinez un tableau, la première colonne est des cellules de coin arrondies, la couleur de fond de chaque colonne est différente, selon le numéro de colonne, le code est le suivant:

import com.itextpdf.io.font.FontConstants;
import com.itextpdf.kernel.color.Color;
import com.itextpdf.kernel.color.DeviceCmyk;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.property.HorizontalAlignment;
import com.itextpdf.layout.border.SolidBorder;
import com.itextpdf.layout.element.Cell;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Table;
import com.itextpdf.layout.property.TextAlignment;
import com.itextpdf.layout.renderer.CellRenderer;
import com.itextpdf.layout.renderer.DrawContext;

import java.io.*;
import java.util.StringTokenizer;

/**
 * Simple table renderer example.
 */
public class C03E02_PremierLeague {

    public static final String DATA = "src/main/resources/data/premier_league.csv";
    public static final String DEST = "results/chapter03/premier_league.pdf";

    Color greenColor = new DeviceCmyk(0.78f, 0, 0.81f, 0.21f);
    Color yellowColor = new DeviceCmyk(0, 0, 0.76f, 0.01f);
    Color redColor = new DeviceCmyk(0, 0.76f, 0.86f, 0.01f);
    Color blueColor = new DeviceCmyk(0.28f, 0.11f, 0, 0);

    public static void main(String args[]) throws IOException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new C03E02_PremierLeague().createPdf(DEST);
    }

    public void createPdf(String dest) throws IOException {

        //Initialize PDF document
        PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
        PageSize ps = new PageSize(842, 680);

        // Initialize document
        Document document = new Document(pdf, ps);

        PdfFont font = PdfFontFactory.createFont(FontConstants.HELVETICA);
        PdfFont bold = PdfFontFactory.createFont(FontConstants.HELVETICA_BOLD);
        Table table = new Table(new float[]{
   
   1.5f, 7, 2, 2, 2, 2, 3, 4, 4, 2});
        table.setWidthPercent(100)
                .setTextAlignment(TextAlignment.CENTER)
                .setHorizontalAlignment(HorizontalAlignment.CENTER);

        BufferedReader br = new BufferedReader(new FileReader(DATA));
        String line = br.readLine();
        process(table, line, bold, true);
        while ((line = br.readLine()) != null) {
            process(table, line, font, false);
        }
        br.close();

        document.add(table);

        //Close document
        document.close();

    }

    public void process(Table table, String line, PdfFont font, boolean isHeader) {
        StringTokenizer tokenizer = new StringTokenizer(line, ";");
        int columnNumber = 0;
        while (tokenizer.hasMoreTokens()) {
            if (isHeader) {
                Cell cell = new Cell().add(new Paragraph(tokenizer.nextToken()));
                cell.setNextRenderer(new RoundedCornersCellRenderer(cell));
                cell.setPadding(5).setBorder(null);
                table.addHeaderCell(cell);
            } else {
                columnNumber++;
                Cell cell = new Cell().add(new Paragraph(tokenizer.nextToken()));
                cell.setFont(font).setBorder(new SolidBorder(Color.BLACK, 0.5f));
                switch (columnNumber) {
                    case 4:
                        cell.setBackgroundColor(greenColor);
                        break;
                    case 5:
                        cell.setBackgroundColor(yellowColor);
                        break;
                    case 6:
                        cell.setBackgroundColor(redColor);
                        break;
                    default:
                        cell.setBackgroundColor(blueColor);
                        break;
                }
                table.addCell(cell);
            }
        }
    }


    private class RoundedCornersCellRenderer extends CellRenderer {
        public RoundedCornersCellRenderer(Cell modelElement) {
            super(modelElement);
        }

        @Override
        public void drawBorder(DrawContext drawContext) {
            Rectangle rectangle = getOccupiedAreaBBox();
            float llx = rectangle.getX() + 1;
            float lly = rectangle.getY() + 1;
            float urx = rectangle.getX() + getOccupiedAreaBBox().getWidth() - 1;
            float ury = rectangle.getY() + getOccupiedAreaBBox().getHeight() - 1;
            PdfCanvas canvas = drawContext.getCanvas();
            float r = 4;
            float b = 0.4477f;
            canvas.moveTo(llx, lly).lineTo(urx, lly).lineTo(urx, ury - r)
                    .curveTo(urx, ury - r * b, urx - r * b, ury, urx - r, ury)
                    .lineTo(llx + r, ury)
                    .curveTo(llx + r * b, ury, llx, ury - r * b, llx, ury - r)
                    .lineTo(llx, lly).stroke();
            super.drawBorder(drawContext);
        }
    }

Exemple 3: ajouter un en-tête, un pied de page et un filigrane

    Dessinez un tableau avec différentes couleurs d'arrière-plan pour les pages paires et impaires, ajoutez un en-tête, un pied de page et un filigrane, le code est le suivant:

import com.itextpdf.io.font.FontConstants;
import com.itextpdf.kernel.color.Color;
import com.itextpdf.kernel.color.DeviceCmyk;
import com.itextpdf.kernel.events.Event;
import com.itextpdf.kernel.events.IEventHandler;
import com.itextpdf.kernel.events.PdfDocumentEvent;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.Canvas;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.border.SolidBorder;
import com.itextpdf.layout.element.Cell;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Table;
import com.itextpdf.layout.property.Property;
import com.itextpdf.layout.property.TextAlignment;
import com.itextpdf.layout.property.UnitValue;
import com.itextpdf.layout.property.VerticalAlignment;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.StringTokenizer;

/**
 * Simple event handler example.
 */
public class C03E03_UFO {

    public static final String DATA = "src/main/resources/data/ufo.csv";
    public static final String DEST = "results/chapter03/ufo.pdf";

    static PdfFont helvetica = null;
    static PdfFont helveticaBold = null;

    public static void main(String[] args) throws Exception {
        helvetica = PdfFontFactory.createFont(FontConstants.HELVETICA);
        helveticaBold = PdfFontFactory.createFont(FontConstants.HELVETICA_BOLD);
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new C03E03_UFO().createPdf(DEST);
    }

    protected void createPdf(String dest) throws Exception {

        //Initialize PDF document
        PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
        pdf.addEventHandler(PdfDocumentEvent.END_PAGE, new MyEventHandler());

        // Initialize document
        Document document = new Document(pdf);

        Paragraph p = new Paragraph("List of reported UFO sightings in 20th century")
                .setTextAlignment(TextAlignment.CENTER).setFont(helveticaBold).setFontSize(14);
        document.add(p);

        Table table = new Table(UnitValue.createPercentArray(new float[]{
   
   3, 5, 7, 4}));

        BufferedReader br = new BufferedReader(new FileReader(DATA));
        String line = br.readLine();
        process(table, line, helveticaBold, true);
        while ((line = br.readLine()) != null) {
            process(table, line, helvetica, false);
        }
        br.close();

        document.add(table);

        document.close();
    }

    public void process(Table table, String line, PdfFont font, boolean isHeader) {
        StringTokenizer tokenizer = new StringTokenizer(line, ";");
        while (tokenizer.hasMoreTokens()) {
            if (isHeader) {
                table.addHeaderCell(new Cell().add(new Paragraph(tokenizer.nextToken()).setFont(font)).setFontSize(9).setBorder(new SolidBorder(Color.BLACK, 0.5f)));
            } else {
                table.addCell(new Cell().add(new Paragraph(tokenizer.nextToken()).setFont(font)).setFontSize(9).setBorder(new SolidBorder(Color.BLACK, 0.5f)));
            }
        }
    }


    protected class MyEventHandler implements IEventHandler {

        public void handleEvent(Event event) {
            PdfDocumentEvent docEvent = (PdfDocumentEvent) event;
            PdfDocument pdfDoc = docEvent.getDocument();
            PdfPage page = docEvent.getPage();
            int pageNumber = pdfDoc.getPageNumber(page);
            Rectangle pageSize = page.getPageSize();
            PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamBefore(), page.getResources(), pdfDoc);

            //Set background
            Color limeColor = new DeviceCmyk(0.208f, 0, 0.584f, 0);
            Color blueColor = new DeviceCmyk(0.445f, 0.0546f, 0, 0.0667f);
            pdfCanvas.saveState()
                    .setFillColor(pageNumber % 2 == 1 ? limeColor : blueColor)
                    .rectangle(pageSize.getLeft(), pageSize.getBottom(), pageSize.getWidth(), pageSize.getHeight())
                    .fill().restoreState();

            //Add header and footer
            pdfCanvas.beginText()
                    .setFontAndSize(helvetica, 9)
                    .moveText(pageSize.getWidth() / 2 - 60, pageSize.getTop() - 20)
                    .showText("THE TRUTH IS OUT THERE")
                    .moveText(60, -pageSize.getTop() + 30)
                    .showText(String.valueOf(pageNumber))
                    .endText();

            //Add watermark
            Canvas canvas = new Canvas(pdfCanvas, pdfDoc, page.getPageSize());
            canvas.setFontColor(Color.WHITE);
            canvas.setProperty(Property.FONT_SIZE, 60);
            canvas.setProperty(Property.FONT, helveticaBold);
            canvas.showTextAligned(new Paragraph("CONFIDENTIAL"), 298, 421, pdfDoc.getPageNumber(page),
                    TextAlignment.CENTER, VerticalAlignment.MIDDLE, 45);

            pdfCanvas.release();
        }
    }
}

Téléchargement de code d'exemple

    Le code de ce chapitre peut être téléchargé à l'adresse suivante (projet IDEA): iText7 —— Chapitre 3 Projet de code source

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Origine blog.csdn.net/u012397189/article/details/77541052
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