Java 開発スキルが明らかに: QR コード生成と解析機能の実装

import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class QRCodeGenerator {

    public static void main(String[] args) {
        String text = "Hello, QR Code!";
        int width = 300;
        int height = 300;
        String format = "png";
        String filePath = "qrcode.png";

        try {
            Map hintMap = new HashMap<>();
            hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
            BitMatrix bitMatrix = new MultiFormatWriter().encode(text, com.google.zxing.BarcodeFormat.QR_CODE, width, height, hintMap);
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    image.setRGB(x, y, bitMatrix.get(x, y) ? Color.BLACK.getRGB() : Color.WHITE.getRGB());
                }
            }
            ImageIO.write(image, format, new File(filePath));
            System.out.println("二维码生成成功！");
        } catch (Exception e) {
            System.err.println("二维码生成失败：" + e.getMessage());
        }
    }

}

import com.google.zxing.BinaryBitmap;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;

public class QRCodeReader {

    public static void main(String[] args) {
        String filePath = "qrcode.png";

        try {
            BufferedImage image = ImageIO.read(new File(filePath));
            BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
            Result result = new MultiFormatReader().decode(binaryBitmap);
            
            System.out.println("解析结果：" + result.getText());
        } catch (Exception e) {
            System.err.println("二维码解析失败：" + e.getMessage());
        }
    }
}