內(nèi)容轉(zhuǎn)載于網(wǎng)絡搓萧，原文鏈接：https://blog.csdn.net/m0_47104939/article/details/125639363
pom文件引入

<!--Java 生成二維碼 -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.3.3</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.3.3</version>
        </dependency>

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import sun.font.FontDesignMetrics;
 
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;
 
public class QRCodeUtil {
    /**
     * 創(chuàng)建二維碼
     * @param charSet 編碼方式
     * @param content 二維碼內(nèi)容
     * @param qrWidth 二維碼長度
     * @param qrHeight 二維碼高度
     * @return
     */
    public static BufferedImage createImage(String charSet, String content, int qrWidth, int qrHeight){
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, charSet);
        hints.put( EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = null;
        try {
            bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE,qrWidth , qrHeight, // 修改二維碼底部高度
                    hints);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        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) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        return image;
    }
 
    /**
     * 對已經(jīng)生成好的二維碼設置logo
     * @param source 二維碼
     * @param logo logo圖片
     * @param logoWidth logo寬度
     * @param logoHeight logo高度
     */
    public static void insertLogoImage(BufferedImage source,Image logo,int logoWidth,int logoHeight){
        Graphics2D graph = source.createGraphics();
        int qrWidth = source.getWidth();
        int qrHeight = source.getHeight();
        int x = (qrWidth - logoWidth) / 2;
        int y = (qrHeight - logoHeight) / 2;
        graph.drawImage(logo, x, y, logoWidth, logoHeight, null);
        Shape shape = new RoundRectangle2D.Float(x, y, logoWidth, logoHeight, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }
 
    /**
     * 縮小logo圖片
     * @param logoPath
     * @param logoWidth
     * @param logoHeight
     * @return
     */
    public static Image compressLogo(String logoPath, int logoWidth, int logoHeight){
        File file = new File(logoPath);
        if (!file.exists()) {
            System.err.println("" + logoPath + "   該文件不存在！");
            return null;
        }
        Image original = null;
        try {
            original = ImageIO.read(new File(logoPath));
        } catch (IOException e) {
            e.printStackTrace();
        }
        int width = original.getWidth(null);
        int height = original.getHeight(null);
        if (width > logoWidth) {
            width = logoWidth;
        }
        if (height > logoHeight) {
            height = logoHeight;
        }
        Image image = original.getScaledInstance(width, height, Image.SCALE_SMOOTH);
        BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = tag.getGraphics();
        g.drawImage(image, 0, 0, null); // 繪制縮小后的圖
        g.dispose();
        return image;
    }
 
    /**
     * 增加底部的說明文字
     * @param source 二維碼
     * @param text 說明內(nèi)容
     * @param step
     */
    public static BufferedImage addBottomFont(BufferedImage source, String text,int step) {
 
        int qrWidth = source.getWidth();
        System.out.println("二維碼的寬度"+qrWidth);
        int qrHeight = source.getHeight();
        System.out.println("二維碼的高度"+qrHeight);
        BufferedImage textImage = textToImage(text, qrWidth, 20,16);
        Graphics2D graph = source.createGraphics();
        //開啟文字抗鋸齒
        graph.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
 
        int width = textImage.getWidth(null);
        int height = textImage.getHeight(null);
 
        Image src = textImage;
        graph.drawImage(src, 0, qrHeight - (20 * step) - 10, width, height, null);
        graph.dispose();
        return  source;
    }
 
    /**
     * 將文明說明增加到二維碼上
     * @param str       文字
     * @param width     寬
     * @param height    高
     * @param fontSize 字體大小
     * @return
     */
    public static BufferedImage textToImage(String str, int width, int height,int fontSize) {
        BufferedImage textImage = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = (Graphics2D)textImage.getGraphics();
        //開啟文字抗鋸齒
        g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        g2.setBackground(Color.WHITE);
        g2.clearRect(0, 0, width, height);
        g2.setPaint(Color.BLACK);
        FontRenderContext context = g2.getFontRenderContext();
        Font font = new Font("微軟雅黑", Font.PLAIN, fontSize);
        g2.setFont(font);
        LineMetrics lineMetrics = font.getLineMetrics(str, context);
        FontMetrics fontMetrics = FontDesignMetrics.getMetrics(font);
        float offset = (width - fontMetrics.stringWidth(str)) / 2;
        float y = (height + lineMetrics.getAscent() - lineMetrics.getDescent() - lineMetrics.getLeading()) / 2;
        g2.drawString(str, (int)offset, (int)y);
        return textImage;
    }
 
    /**
     * 頂部增加說明文字
     * @param source
     * @param text
     */
    public static void addUpFont(BufferedImage source, String text) {
        int qrWidth = source.getWidth();
        int qrHeight = source.getHeight();
 
        BufferedImage textImage = textToImage(text, qrWidth, 10,10);
        Graphics2D graph = source.createGraphics();
        //開啟文字抗鋸齒
        graph.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
 
        int width = textImage.getWidth(null);
        int height = textImage.getHeight(null);
 
        Image src = textImage;
        graph.drawImage(src, 0, 4, width, height, null);
        graph.dispose();
    }
 
    /**
     * 生成二維碼圖片
     * @param charSet 二維碼編碼方式
     * @param content 內(nèi)容
     * @param qrWidth 寬度
     * @param qrHeight 長度
     * @param formatName jpg等圖片格式
     * @param imgPath 二維碼存放路徑
     */
    public static void encode(String charSet,String content,int qrWidth,int qrHeight,String formatName,String imgPath){
        BufferedImage image = QRCodeUtil.createImage(charSet,content,qrWidth,qrHeight);
        try {
            ImageIO.write(image, formatName, new File(imgPath));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 
    /**
     * 生成二維碼圖片流
     * @param charSet 二維碼編碼方式
     * @param content 內(nèi)容
     * @param qrWidth 寬度
     * @param qrHeight 長度
     * @return
     */
    public static BufferedImage encode(String charSet,String content,int qrWidth,int qrHeight) {
        BufferedImage image = QRCodeUtil.createImage(charSet,content,qrWidth,qrHeight);
        return image;
    }
 
    public static void encode( BufferedImage image,String formatName,String imgPath){
        try {
 
            ImageIO.write(image, formatName, new File(imgPath));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 
    public static void mkdirs(String destPath) {
        File file = new File(destPath);
        // 當文件夾不存在時宛畦，mkdirs會自動創(chuàng)建多層目錄瘸洛，區(qū)別于mkdir．(mkdir如果父目錄不存在則會拋出異常)
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
    }
 
    /*
     * 解析二維碼
     */
    public static String decode(File file, String cherSet) throws Exception {
        BufferedImage image;
        image = ImageIO.read(file);
        if (image == null) {
            return null;
        }
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        Result result;
        Hashtable hints = new Hashtable();
        hints.put(DecodeHintType.CHARACTER_SET, cherSet);
        result = new MultiFormatReader().decode(bitmap, hints);
        String resultStr = result.getText();
        return resultStr;
    }

public static void main(String[] args) {
        String url = "https://www.baidu.com";
        BufferedImage image = QRCodeUtil.createImage("utf-8", url, 300, 300);
        QRCodeUtil.addUpFont(image, "baidu");
        String imagePath = null;
        String path = null;
        File file = new File("本地要存儲的路徑");
        try {
            ImageIO.write(image, "JPEG", file);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {

        }
        System.out.println("生成二維碼成功！");
    }
}