Java生成二维码解密二维码工具类

maven

    <!-- 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>
    <dependency>
      <groupId>cn.hutool</groupId>
      <artifactId>hutool-all</artifactId>
      <version>5.7.16</version>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.4</version>
    </dependency>

代码

import cn.hutool.core.io.FileUtil;
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.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import javax.imageio.ImageIO;
import lombok.extern.log4j.Log4j2;

@Log4j2
public class QRCodeUtil {

	static String format = "png";

	static int width = 300;
	static int height = 300;

	public static void main(String[] args) {
		QrEncode("内容", new File("该更成你要的地址"));
		String qrDecode = QrDecode(new File("该更成你要的地址"));
		System.out.println(qrDecode);
	}

	public static String QrDecode(String filePath) {
		return QrDecode(new File(filePath));
	}

	public static String QrDecode(File file) {
		BufferedImage image = null;
		try {
			image = ImageIO.read(file);
			BinaryBitmap binaryBitmap = new BinaryBitmap(
				new HybridBinarizer(new BufferedImageLuminanceSource(image)));

			Result result = new MultiFormatReader().decode(binaryBitmap);
			return result.getText();
		} catch (Exception e) {
			log.error("二维码解码失败：{}", e);
		}
		return null;
	}


	public static void QrEncode(String content, String filePath) {
		QrEncode(width, height, content, new File(filePath));
	}

	public static void QrEncode(String content, File file) {
		QrEncode(width, height, content, file);
	}


	public static void QrEncode(int width, int height, String content, File file) {
		if (Objects.isNull(file)) {
			new RuntimeException("file cannot be null");
		}
		boolean pathEndsWith = FileUtil.pathEndsWith(file, format);
		if (!pathEndsWith) {
			new RuntimeException("format must be png");

		}
		Map<EncodeHintType, Object> hints = new HashMap<>();
		hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
		try {
			BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE,
				width, height, hints);
			MatrixToImageWriter.writeToStream(bitMatrix, format, new FileOutputStream(file));
		} catch (Exception e) {
			log.error("二维码生成失败：{}", e);
		}
	}

}