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BAEL-5772 add code for the Edit Existing PDF Files in Java article

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thibault.faure 2022-10-03 23:41:45 +02:00
parent 21ea0eb611
commit cb6790e12d
10 changed files with 220 additions and 0 deletions
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pdf-2/pom.xml Normal file
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<?xml version="1.0"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>pdf-2</artifactId>
<name>pdf-2</name>
<url>http://maven.apache.org</url>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itext7-core</artifactId>
<version>${itextpdf.core.version}</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>cleanup</artifactId>
<version>${itextpdf.cleanup.version}</version>
</dependency>
</dependencies>
<build>
<finalName>pdf</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
<properties>
<itextpdf.core.version>7.2.3</itextpdf.core.version>
<itextpdf.cleanup.version>3.0.1</itextpdf.cleanup.version>
</properties>
</project>

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pdf-2/src/main/java/com/baeldung/pdfedition/PdfContentRemover.java Normal file
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package com.baeldung.pdfedition;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.pdfcleanup.CleanUpProperties;
import com.itextpdf.pdfcleanup.PdfCleanUpLocation;
import com.itextpdf.pdfcleanup.PdfCleanUpTool;
import com.itextpdf.pdfcleanup.PdfCleaner;
import com.itextpdf.pdfcleanup.autosweep.CompositeCleanupStrategy;
import com.itextpdf.pdfcleanup.autosweep.RegexBasedCleanupStrategy;
public class PdfContentRemover {
private static final String SOURCE = "src/main/resources/baeldung-modified.pdf";
private static final String DESTINATION = "src/main/resources/baeldung-cleaned.pdf";
public static void main(String[] args) throws IOException {
PdfReader reader = new PdfReader(SOURCE);
PdfWriter writer = new PdfWriter(DESTINATION);
PdfDocument pdfDocument = new PdfDocument(reader, writer);
removeContentFromDocument(pdfDocument);
pdfDocument.close();
}
private static void removeContentFromDocument(PdfDocument pdfDocument) throws IOException {
// 5.1. remove text
CompositeCleanupStrategy strategy = new CompositeCleanupStrategy();
strategy.add(new RegexBasedCleanupStrategy("Baeldung"));
PdfCleaner.autoSweepCleanUp(pdfDocument, strategy);
// 5.2. remove other areas
List<PdfCleanUpLocation> cleanUpLocations = Arrays.asList(new PdfCleanUpLocation(1, new Rectangle(10, 50, 90, 70)), new PdfCleanUpLocation(2, new Rectangle(35, 400, 100, 35)));
PdfCleanUpTool cleaner = new PdfCleanUpTool(pdfDocument, cleanUpLocations, new CleanUpProperties());
cleaner.cleanUp();
}
}

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pdf-2/src/main/java/com/baeldung/pdfedition/PdfEditor.java Normal file
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package com.baeldung.pdfedition;
import java.io.IOException;
import java.net.MalformedURLException;
import com.itextpdf.forms.PdfAcroForm;
import com.itextpdf.forms.fields.PdfFormField;
import com.itextpdf.forms.fields.PdfTextFormField;
import com.itextpdf.io.image.ImageData;
import com.itextpdf.io.image.ImageDataFactory;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfString;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.annot.PdfAnnotation;
import com.itextpdf.kernel.pdf.annot.PdfTextAnnotation;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Image;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Table;
import com.itextpdf.layout.element.Text;
import com.itextpdf.layout.properties.UnitValue;
public class PdfEditor {
private static final String SOURCE = "src/main/resources/baeldung.pdf";
private static final String DESTINATION = "src/main/resources/baeldung-modified.pdf";
public static void main(String[] args) throws IOException {
PdfReader reader = new PdfReader(SOURCE);
PdfWriter writer = new PdfWriter(DESTINATION);
PdfDocument pdfDocument = new PdfDocument(reader, writer);
addContentToDocument(pdfDocument);
}
private static void addContentToDocument(PdfDocument pdfDocument) throws MalformedURLException {
// 4.1. add form
PdfFormField personal = PdfFormField.createEmptyField(pdfDocument);
personal.setFieldName("information");
PdfTextFormField name = PdfFormField.createText(pdfDocument, new Rectangle(35, 400, 100, 30), "name", "");
personal.addKid(name);
PdfAcroForm.getAcroForm(pdfDocument, true)
.addField(personal, pdfDocument.getFirstPage());
// 4.2. add new page
pdfDocument.addNewPage(1);
// 4.3. add annotation
PdfAnnotation ann = new PdfTextAnnotation(new Rectangle(40, 435, 0, 0)).setTitle(new PdfString("name"))
.setContents("Your name");
pdfDocument.getPage(2)
.addAnnotation(ann);
// create document form pdf document
Document document = new Document(pdfDocument);
// 4.4. add an image
ImageData imageData = ImageDataFactory.create("src/main/resources/baeldung.png");
Image image = new Image(imageData).scaleAbsolute(550, 100)
.setFixedPosition(1, 10, 50);
document.add(image);
// 4.5. add a paragraph
Text title = new Text("This is a demo").setFontSize(16);
Text author = new Text("Baeldung tutorials.");
Paragraph p = new Paragraph().setFontSize(8)
.add(title)
.add(" from ")
.add(author);
document.add(p);
// 4.6. add a table
Table table = new Table(UnitValue.createPercentArray(2));
table.addHeaderCell("#");
table.addHeaderCell("company");
table.addCell("name");
table.addCell("baeldung");
document.add(table);
// close the document
// this automatically closes the pdfDocument, which then closes automatically the pdfReader and pdfWriter
document.close();
}
}

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pdf-2/src/main/java/com/baeldung/pdfedition/PdfTextReplacement.java Normal file
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package com.baeldung.pdfedition;
import java.io.IOException;
import com.itextpdf.kernel.colors.ColorConstants;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.kernel.pdf.canvas.parser.listener.IPdfTextLocation;
import com.itextpdf.layout.Canvas;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.pdfcleanup.PdfCleaner;
import com.itextpdf.pdfcleanup.autosweep.CompositeCleanupStrategy;
import com.itextpdf.pdfcleanup.autosweep.RegexBasedCleanupStrategy;
public class PdfTextReplacement {
private static final String SOURCE = "src/main/resources/baeldung-modified.pdf";
private static final String DESTINATION = "src/main/resources/baeldung-fixed.pdf";
public static void main(String[] args) throws IOException {
PdfReader reader = new PdfReader(SOURCE);
PdfWriter writer = new PdfWriter(DESTINATION);
PdfDocument pdfDocument = new PdfDocument(reader, writer);
replaceTextContentFromDocument(pdfDocument);
pdfDocument.close();
}
private static void replaceTextContentFromDocument(PdfDocument pdfDocument) throws IOException {
CompositeCleanupStrategy strategy = new CompositeCleanupStrategy();
strategy.add(new RegexBasedCleanupStrategy("Baeldung tutorials").setRedactionColor(ColorConstants.WHITE));
PdfCleaner.autoSweepCleanUp(pdfDocument, strategy);
for (IPdfTextLocation location : strategy.getResultantLocations()) {
PdfPage page = pdfDocument.getPage(location.getPageNumber() + 1);
PdfCanvas pdfCanvas = new PdfCanvas(page.newContentStreamAfter(), page.getResources(), page.getDocument());
Canvas canvas = new Canvas(pdfCanvas, location.getRectangle());
canvas.add(new Paragraph("HIDDEN").setFontSize(8)
.setMarginTop(0f));
}
}
}

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pom.xml
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<module>patterns-modules</module>
<module>pdf</module>
<module>pdf-2</module>
<module>performance-tests</module>
<module>persistence-modules</module>
<module>protobuffer</module>