Java契約書における公印の真正性の識別：実践的な方法と事例分析

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.tools.imageio.ImageIOUtil;

import java.awt.image.BufferedImage;
import java.io.File;

public class SealExtractor {

    public static void extractSeal(String pdfPath, String outputPath) {
        try {
            PDDocument document = PDDocument.load(new File(pdfPath));
            PDFRenderer renderer = new PDFRenderer(document);

            for (int i = 0; i < document.getNumberOfPages(); i++) {
                PDPage page = document.getPage(i);
                BufferedImage image = renderer.renderImageWithDPI(i, 300);
                ImageIOUtil.writeImage(image, outputPath + "/seal_" + i + ".png", 300);
            }

            document.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        String pdfPath = "合同文件路径";
        String outputPath = "输出路径";
        extractSeal(pdfPath, outputPath);
    }
}

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class SealFeatureExtractor {

    public static void extractFeatures(String imagePath) {
        try {
            BufferedImage image = ImageIO.read(new File(imagePath));
            // 在这里进行公章特征提取的逻辑处理
            // ...
            
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        String imagePath = "公章图片路径";
        extractFeatures(imagePath);
    }
}

public class SealVerifier {

    public static boolean verifySeal(String imagePath) {
        // 在这里进行公章真假鉴别的逻辑处理
        // ...

        return true; // 这里返回鉴别结果，true表示真，false表示假
    }

    public static void main(String[] args) {
        String imagePath = "公章图片路径";
        boolean result = verifySeal(imagePath);
        System.out.println("Seal verification result: " + result);
    }
}

public class SealVerificationExample {

    public static void main(String[] args) {
        String pdfPath = "合同文件路径";
        String outputPath = "输出路径";
        SealExtractor.extractSeal(pdfPath, outputPath);
        
        String imagePath = outputPath + "/seal_0.png";
        SealFeatureExtractor.extractFeatures(imagePath);
        
        boolean result = SealVerifier.verifySeal(imagePath);
        System.out.println("Seal verification result: " + result);
    }
}