Распознавание текста на изображениях

public class ImageRecognition {
    public static void main(String[] args) throws Exception {
        PDDocument document = PDDocument.load(new File("path_to_your_file.pdf"));
        PDPage page = document.getPage(0);
        PDPageContentStream contentStream = new PDPageContentStream(document, page);
        PDImageXObject pdImage = PDImageXObject.createImage(new File("path_to_your_image.png"), document);
        contentStream.drawImage(pdImage, 100, 500);
        contentStream.close();
        document.save("path_to_your_file_with_image.pdf");
        document.close();
    }
}

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

public class WatermarkExample {
    public static void main(String[] args) throws Exception {
        PDDocument document = PDDocument.load(new File("path_to_your_file.pdf"));
        PDPage page = document.getPage(0);
        PDPageContentStream contentStream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true, true);
        contentStream.setFont(PDType1Font.HELVETICA_BOLD, 48);
        contentStream.setStrokingColor(Color.GRAY);
        contentStream.beginText();
        contentStream.newLineAtOffset(100, 500);
        contentStream.showText("Водяной знак");
        contentStream.endText();
        contentStream.close();
        document.save("path_to_your_file_with_watermark.pdf");
        document.close();
    }
}
``````java
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;

public class WatermarkAddition {
    public static void main(String[] args) throws Exception {
        PDDocument document = PDDocument.load(new File("path_to_your_file.pdf"));
        PDPage page = document.getPage(gst);
        PDPageContentStream contentStream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true, true);
        contentStream.setFont(PDType1Font.HELVETICA_BOLD, 48);
        contentStream.setStrokingColor(Color.GRAY);
        contentStream.beginText();
        contentStream.newLineAtOffset(100, 500);
        contentStream.showText("Водяной знак");
        contentStream.endText();
        contentStream.close();
        document.save("path_to_your_file_with_watermark.pdf");
        document.close();
    }
}

<dependency>
    <groupId>org.apache.tika</groupId>
    <artifactId>tika-core</artifactId>
    <version>1.24.1</version>
</dependency>
<dependency>
    <groupId>org.apache.tika</groupId>
    <artifactId>tika-parsers</artifactId>
    <version>1.24.1</version>
</dependency>
<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox</artifactId>
    <version>2.0.24</version>
</dependency>

soffice -headless -accept="socket,host=127.0.0.1,port=8100;urp;" -nofirststartwizard