Java检测图片是否是二维码

maven

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    <!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
    <dependency>
      <groupId>com.google.zxing</groupId>
      <artifactId>core</artifactId>
      <version>3.3.3</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
    <dependency>
      <groupId>com.google.zxing</groupId>
      <artifactId>javase</artifactId>
      <version>3.4.1</version>
    </dependency>

代码 

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;

import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;

public class QRCode {

	public static void main(String[] args) {
		try {
			//生成二维码
			String text = "Hello, world!";
			int width = 300;
			int height = 300;
			String format = "png";

			Map<EncodeHintType, Object> hints = new HashMap<>();
			hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");

			try {
				BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE,
					width, height, hints);
				Path path = FileSystems.getDefault().getPath("./qrcode." + format);
				MatrixToImageWriter.writeToPath(bitMatrix, format, path);
				System.out.println("QR code generated successfully!");
			} catch (Exception e) {
				System.err.println("Failed to generate QR code: " + e.getMessage());
			}
			//解码
			File file = new File("./qrcode." + format);
			BufferedImage image = ImageIO.read(file);
			BinaryBitmap binaryBitmap = new BinaryBitmap(
				new HybridBinarizer(new BufferedImageLuminanceSource(image)));

			Result result = new MultiFormatReader().decode(binaryBitmap);
			System.out.println("Decoded text: " + result.getText());
		} catch (Exception e) {
			System.err.println("Failed to decode QR code: " + e.getMessage());
		}
	}
}

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