本教程展示如何使用Spire.PDF for Java在PDF中添加图片图章。

import com.spire.pdf.annotations.PdfRubberStampAnnotation;
import com.spire.pdf.annotations.appearance.PdfAppearance;
import com.spire.pdf.graphics.PdfImage;
import com.spire.pdf.graphics.PdfTemplate;

import java.awt.geom.Rectangle2D;

public class ImageStamp {

    public static void main(String[] args) {

        //创建PdfDocument对象
        PdfDocument doc = new PdfDocument();

        //加载PDF文档
        doc.loadFromFile("C:\\Users\\Administrator\\Desktop\\test.pdf");

        //获取第一页
        PdfPageBase page = doc.getPages().get(0);

        //加载图片到PdfImage对象
        PdfImage image = PdfImage.fromFile("C:\\Users\\Administrator\\Desktop\\quality-control-stamp.png");

        //获取图片高宽
        int width = image.getWidth();
        int height = image.getHeight();

        //创建PdfTemplate对象，大小跟图片一致
        PdfTemplate template = new PdfTemplate(width, height);

        //在模板上绘制图片
        template.getGraphics().drawImage(image, 0, 0, width, height);

        //创建PdfRubebrStampAnnotation对象，指定大小和位置
        Rectangle2D rect = new Rectangle2D.Float((float) (page.getActualSize().getWidth() - width - 50), (float) (page.getActualSize().getHeight() - height - 80), width, height);
        PdfRubberStampAnnotation stamp = new PdfRubberStampAnnotation(rect);

        //创建PdfAppearance对象
        PdfAppearance pdfAppearance = new PdfAppearance(stamp);

        //将模板应用为PdfAppearance的一般状态
        pdfAppearance.setNormal(template);

        //将PdfAppearance 应用为图章的样式
        stamp.setAppearance(pdfAppearance);

        //添加图章到PDF
        page.getAnnotationsWidget().add(stamp);

        //保存文档
        doc.saveToFile("ImageStamp.pdf");
        doc.close();
    }
}