Java 在PDF中添加骑缝章

1、方式1：通过官网下载jar包，并解压，手动导入lib文件夹下的Spire.Pdf.jar文件。

方式2：通过创建Maven程序，在pom.xml中配置maven仓库路径并指定Free Spire.PDF for Java 的依赖，配置完成后，在IDEA中，点击“Import Changes”导入JAR包：

<repositories>

        <repository>

            <id>com.e-iceblue</id>

            <url>http://repo.e-iceblue.cn/repository/maven-public/</url>

        </repository>

</repositories>

<dependencies>

    <dependency>

        <groupId>e-iceblue</groupId>

        <artifactId>spire.pdf.free</artifactId>

        <version>2.6.3</version>

    </dependency>

</dependencies>

jar导入结果如下图所示：

1、import com.spire.pdf.*;

import com.spire.pdf.graphics.PdfGraphicsUnit;
import com.spire.pdf.graphics.PdfImage;
import com.spire.pdf.graphics.PdfUnitConvertor;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class AcrossPageSeal {
    public static void main(String[] args) throws IOException {
        //加载测试文档
        PdfDocument pdf = new PdfDocument();
        pdf.loadFromFile("test.pdf");

        //获取分割后的印章图片
        BufferedImage[] images = GetImage(pdf.getPages().getCount());
        float x = 0;
        float y = 0;

        //实例化PdfUnitConvertor类
        PdfUnitConvertor convert = new PdfUnitConvertor();
        PdfPageBase pageBase;
        //将图片绘制到PDF页面上的指定位置
        for (int i = 0; i < pdf.getPages().getCount(); i++)
        {
            BufferedImage image= images[ i ];
            pageBase = pdf.getPages().get(i);
            x = (float)pageBase.getSize().getWidth() - convert.convertUnits(image.getWidth(), PdfGraphicsUnit.Point, PdfGraphicsUnit.Pixel) + 40;
            y = (float) pageBase.getSize().getHeight()/ 2;
            pageBase.getCanvas().drawImage(PdfImage.fromImage(image), new Point2D.Float(x, y));
        }

        //保存PDF文档
        pdf.saveToFile("Result.pdf");
    }

    //定义GetImage方法，根据PDF页数分割印章图片
    static BufferedImage[] GetImage(int num) throws IOException {
        String originalImg = "seal.png";
        BufferedImage image = ImageIO.read(new File(originalImg));
        int rows = 1;
        int cols = num;
        int chunks = rows * cols;
        int chunkWidth = image.getWidth() / cols;
        int chunkHeight = image.getHeight() / rows;
        int count = 0;
        BufferedImage[] imgs = new BufferedImage[ chunks ];
        for (int x = 0; x < rows; x++) {
            for (int y = 0; y < cols; y++) {
                imgs[ count ] = new BufferedImage(chunkWidth, chunkHeight, image.getType());
                Graphics2D gr = imgs[ count++ ].createGraphics();
                gr.drawImage(image, 0, 0, chunkWidth, chunkHeight,
                        chunkWidth * y, chunkHeight * x,
                        chunkWidth * y + chunkWidth, chunkHeight * x + chunkHeight, Color.WHITE,null);
                gr.dispose();
            }
        }
        return imgs;
    }

}

骑缝章添加效果：