ZXing是一个开放源码的，用Java实现的多种格式的1D/2D条码图像处理库，它包含了联系到其他语言的端口。Zxing可以实现使用手机的内置的摄像头完成条形码的扫描及解码。
导入对应的jar 包

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<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>core</artifactId>
	<version>3.4.1</version>
</dependency>

<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>javase</artifactId>
	<version>3.4.1</version>
</dependency>

对应的 Utils 实现生成或者解析对应的二维码信息

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package com.ruoyi.common.utils;

import com.google.zxing.*;
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 com.google.zxing.qrcode.QRCodeWriter;

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

/**
 * 生成二维码 填充信息
 */
package com.ruoyi.common.utils;

import com.google.zxing.*;
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 com.google.zxing.qrcode.QRCodeWriter;

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

/**
 * 生成二维码 填充信息
 */
public class QrCodeUtils {

    /**
     *
     * @param text 对应的信息
     * @param width 图片宽度
     * @param height 图片高度
     * @param filePath 存放位置
     * @throws WriterException
     * @throws IOException
     */
    public static void generateQRCodeImage(String text, int width, int height, String filePath) // Generate QR Code image
            throws WriterException, IOException {
        QRCodeWriter qrCodeWriter = new QRCodeWriter(); // Create QR Code writer
        Map<EncodeHintType, Object> hints = new HashMap<>(); // Set QR Code encoding hints
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); // Set character set to UTF-8
        BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);
        Date date = new Date();
        SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmssSSS");
        String number = format.format(date);
        File qrCodeFile = new File(filePath + "/" + number+ ".png");
        MatrixToImageWriter.writeToPath(bitMatrix, "PNG", qrCodeFile.toPath());
    }


    public static void analysisQRCodeImage() throws IOException, NotFoundException {
        File file = new File("D://path/20240717143149228.png");
        BufferedImage bufferedImage = ImageIO.read(file);
        LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

        Result result = new MultiFormatReader().decode(bitmap);
        System.out.println("QR Code content: " + result.getText());
    }
}

具体调用

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QrCodeUtils.generateQRCodeImage("12321", 350, 350, "D://path");
QrCodeUtils.analysisQRCodeImage();