<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>${version}</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>${version}</version>
</dependency>

// 二維碼內(nèi)容
String text = "https://engr-z.com";
// 二維碼大小
int width = 500, height = 500;
// 二維碼輸出文件
File file = new File("/home/engr-z/qrcode.png");

QRCodeWriter writer = new QRCodeWriter();
BitMatrix m = writer.encode(text, BarcodeFormat.QR_CODE, width, height);
MatrixToImageWriter.writeToPath(m, "png", file.toPath());

// 二維碼內(nèi)容
String text = "https://engr-z.com";
// 二維碼大小
int width = 500, height = 500;
// 二維碼參數(shù)
CodeStyle style = new CodeStyle();
style.setWidth(width);
style.setHeight(height);

Map<EncodeHintType, Object> hints = new HashMap<>();
//內(nèi)容編碼格式
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
// 指定糾錯等級
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
//設置二維碼邊的空度，非負數(shù)
hints.put(EncodeHintType.MARGIN, 1);

// 生成二維碼圖片
QRCodeWriter writer = new QRCodeWriter();
BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, style.getWidth(), style.getHeight(), hints);

int margin = style.getMargin();
int tempM = margin*2;
int[] rec = bm.getEnclosingRectangle();   //獲取二維碼圖案的屬性
int resWidth = rec[2] + tempM;
int resHeight = rec[3] + tempM;
BitMatrix resMatrix = new BitMatrix(resWidth, resHeight); // 按照自定義邊框生成新的BitMatrix
resMatrix.clear();
for (int i = margin; i < resWidth - margin; i++) {   //循環(huán)，將二維碼圖案繪制到新的bitMatrix中
    for (int j = margin; j < resHeight - margin; j++){
        if (bm.get(i - margin + rec[0], j - margin + rec[1])){
            resMatrix.set(i, j);
        }
    }
}
bm = resMatrix;

int w = bm.getWidth();
int h = bm.getHeight();
BufferedImage qrcodeBuffImg = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

// 開始利用二維碼數(shù)據(jù)創(chuàng)建Bitmap圖片
for (int x = 0; x < w; x++) {
    for (int y = 0; y < h; y++) {
        qrcodeBuffImg.setRGB(x, y, bm.get(x, y) ? style.getCodeColor() : style.getBackgroundColor());
    }
}

/**
 * 讀取Logo圖片
 */
File logoFile = new File("/home/engr-z/logo.png");
BufferedImage logo = ImageIO.read(logoFile);
/**
 * 設置logo的大小，設置為二維碼圖片的20%
 */
int widthLogo = logo.getWidth(null) > qrcodeBuffImg.getWidth() * 3 / 10 ? (qrcodeBuffImg.getWidth() * 3 / 10)
        : logo.getWidth(null),
        heightLogo = logo.getHeight(null) > qrcodeBuffImg.getHeight() * 3 / 10 ? (qrcodeBuffImg.getHeight() * 3 / 10) : logo.getWidth(null);

/**
 * logo在二維碼的位置
 */
int x = (qrcodeBuffImg.getWidth() - widthLogo) / 2;
int y = (qrcodeBuffImg.getHeight() - heightLogo) / 2;

Graphics2D qrcodeOutg = qrcodeBuffImg.createGraphics();
// 把logo寫到二維碼圖片中間
qrcodeOutg.drawImage(logo, x, y, widthLogo, heightLogo, null);
qrcodeOutg.dispose();
qrcodeBuffImg.flush();

// 新的圖片，把帶logo的二維碼下面加上文字
String desc = "https://engr-z.com";
int textHeight = 26;
int textMargin = 10;
BufferedImage outImage = new BufferedImage(qrcodeBuffImg.getWidth(), qrcodeBuffImg.getHeight() + textHeight + (textMargin * 2), BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D outg = outImage.createGraphics();
// 畫二維碼到新的面板
outg.drawImage(qrcodeBuffImg, 0, 0, qrcodeBuffImg.getWidth(), qrcodeBuffImg.getHeight(), null);
outg.setFont(new Font("宋體", Font.BOLD, 26)); // 字體、字型、字號
int strWidth = outg.getFontMetrics().stringWidth(desc);
outg.setColor(Color.BLACK);
outg.drawString(desc, (outImage.getWidth() - strWidth) / 2, outImage.getHeight() - textMargin);
outg.dispose();

// 二維碼輸出文件
File file = new File("/home/engr-z/qrcode.png");
ImageIO.write(outImage, "png", file);

/**
 * @author Engr-Z
 * @since 2020/12/18
 */
@Data
public class CodeStyle {

    /**
     * 背景顏色，如：0xFFFFFFFF
     */
    private int backgroundColor = 0xFFFFFFFF;

    /**
     * 碼顏色，如：0xFF000000
     */
    private int codeColor = 0xFF000000;

    /**
     * 二維碼寬，px
     */
    private int width;

    /**
     * 二維碼高，px
     */
    private int height;

    /**
     * 邊框大小
     */
    private int margin = 5;

}

File qrcodeFile = new File("D:/qrcode.png");
BufferedImage qrcodeImg = ImageIO.read(qrcodeFile);

MultiFormatReader formatReader = new MultiFormatReader();
//讀取指定的二維碼文件
BinaryBitmap binaryBitmap= new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(qrcodeImg)));
//定義二維碼參數(shù)
Map<DecodeHintType, Object> hints= new HashMap<>();
hints.put(DecodeHintType.CHARACTER_SET, "utf-8");
// 讀取
Result result = formatReader.decode(binaryBitmap, hints);
log.info("格式類型：{}", result.getBarcodeFormat());
log.info("二維碼內(nèi)容：{}", result.getText());