引入依赖

com.google.zxing
core
3.2.1

import com.google.zxing.BarcodeFormat;
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.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class QoUtil {
    

    private static final int black = 0xff000000;
    private static final int white = 0xffffffff;

    /**
     * 把生成的二维码存入到图片中
     *
     * @param matrix zxing包下的二维码类
     * @return
     */
    public static BufferedImage toBufferedImage(BitMatrix matrix) {
    
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage Image = new BufferedImage(270, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width - 30; x++) {
    
            for (int y = 0; y < height; y++) {
    
                Image.setRGB(x, y, matrix.get(x, y) ? black : white);
            }
        }
        // 控制二维码内容向左平移50，靠左展示，右侧可添加文字
        Graphics2D graphics = Image.createGraphics();
        // 平移位置
        graphics.translate(-50, 0);
        // 绘图
        graphics.drawImage(Image, null, null);
        return Image;
    }

    /**
     * 生成二维码并写入文件
     *
     * @param content 扫描二维码的内容
     * @param format  图片格式 jpg
     * @param file    文件
     * @throws Exception
     */
    public static void writetofile(String content, String format, File file)
            throws Exception {
    
        MultiFormatWriter MultiFormatWriter = new MultiFormatWriter();
        @SuppressWarnings("rawtypes")
        Map hints = new HashMap();
        //设置utf-8， 防止中文乱码
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        //设置二维码四周白色区域的大小
        hints.put(EncodeHintType.MARGIN, 11);
        //设置二维码的容错性
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        //画二维码
        BitMatrix BitMatrix = MultiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 300, 200, hints);
        BufferedImage Image = toBufferedImage(BitMatrix);
        if (!ImageIO.write(Image, format, file)) {
    
            throw new IOException("could not write an Image of format " + format + " to " + file);
        }
    }

    /**
     * 给二维码图片加上文字
     *
     * @param presstext 文字
     * @param qrfile    二维码文件
     * @param Fontstyle
     * @param color
     * @param Fontsize
     */
    public static void presstext(String presstext, File qrfile, int Fontstyle, Color color, int Fontsize) throws Exception {
    
        presstext = new String(presstext.getBytes(), "utf-8");
        Image src = ImageIO.read(qrfile);
        int Imagew = src.getWidth(null);
        int Imageh = src.getHeight(null);
        BufferedImage Image = new BufferedImage(Imagew, Imageh, BufferedImage.TYPE_INT_RGB);
        Graphics g = Image.createGraphics();
        g.drawImage(src, 0, 0, Imagew, Imageh, null);
        //设置画笔的颜色
        g.setColor(color);
        //设置字体
        Font Font = new Font("宋体", Fontstyle, Fontsize);
        FontMetrics metrics = g.getFontMetrics(Font);
        //文字在图片中的坐标 这里设置在右侧
        int startx = 200;
        int starty = 80;
        g.setFont(Font);
        g.drawString(presstext, startx, starty);
        g.dispose();
        FileOutputStream out = new FileOutputStream(qrfile);
        ImageIO.write(Image, "jpeg", out);
        out.close();
        System.out.println("Image press success");
    }

    public static void main(String[] args) throws Exception {
    
        File qrcfile = new File("F:\\11", "13.jpg");
        // 二维码内容设置链接，微信扫描后会自动跳转该链接；二维码内容设置文字，微信扫描后会展示文字；
//        writetofile("https://www.baidu.com/", "jpg", qrcfile);
        writetofile("hahahaahah", "jpg", qrcfile);
        presstext("百度", qrcfile, 5, Color.red, 32);
    }
}

运行生成带文字二维码示例

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