四时宝库

有时候我们经常会想要实现二维码批量生成的功能，这里提供一个二维码生成以及解析的工具类，包括可以上传logo,代码如下：

/**
 * 二维码工具类
 * @date 20198年10月31日
 * @version 1.0
 */
public class QRCodeUtils {
    // 二维码大小
    private static final int QRCODE_SIZE = 300;  
    // 二维码中间logo的尺寸
    private static final int WIDTH  = 60;
    private static final int HEIGHT = 60;
    public static void encode(String content, String logoPath, String imgPath)  throws Exception {  
        encode(content, logoPath, imgPath, QRCODE_SIZE, 1);  
    }
    public static void encode(String content, String logoPath, String imgPath, int size, int margin)  throws Exception {  
        BufferedImage image = createImage(content, logoPath, size, margin);  
        ImageIO.write(image, "png", new File(imgPath));  
    }
    public static void encode(String content, String logoPath, OutputStream output) throws Exception {  
        encode(content, logoPath, output, QRCODE_SIZE, 1);
    }
    public static void encode(String content, String logoPath, OutputStream output, int size, int margin) throws Exception {  
        BufferedImage image = createImage(content, logoPath, size, margin);  
        ImageIO.write(image, "png", output);  
    }
    private static BufferedImage createImage(String content, String imgPath, int size, int margin) throws Exception {  
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();  
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);  
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");  
        hints.put(EncodeHintType.MARGIN, margin); 
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, size, size, hints); 
        int[] rec = bitMatrix.getEnclosingRectangle();  
        int resWidth  = rec[2] + 1;  
        int resHeight = rec[3] + 1;  
        BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);  
        resMatrix.clear();  
        for (int i = 0; i < resWidth; i++) {  
            for (int j = 0; j < resHeight; j++) {  
                if (bitMatrix.get(i + rec[0], j + rec[1])) { 
                     resMatrix.set(i, j); 
                } 
            }  
        }  
        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);  
            }  
        }  
        if (imgPath == null || "".equals(imgPath)) {  
            return image;  
        }  
        // 插入图片  
        insertImage(image, imgPath, size);  
        return image;  
    }  
    private static void insertImage(BufferedImage source, String imgPath, int size) throws Exception {  
        File file = new File(imgPath);  
        if (!file.exists()) {  
            System.out.println(""+imgPath+"   该文件不存在！");  
            return;  
        }  
        Image src  = ImageIO.read(new File(imgPath));  
        int width  = src.getWidth(null);  
        int height = src.getHeight(null);
        // 压缩LOGO
        if (width > WIDTH) {  
            width = WIDTH;  
        }  
        if (height > HEIGHT) {  
            height = HEIGHT;  
        }  
        Image image = src.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); // 绘制缩小后的图  
        g.dispose();  
        src = image;  
        // 插入LOGO  
        Graphics2D graph = source.createGraphics();  
        int x = (size - width) / 2;  
        int y = (size - height) / 2;  
        graph.drawImage(src, x, y, width, height, null);  
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);  
        graph.setStroke(new BasicStroke(3f));  
        graph.draw(shape);  
        graph.dispose();  
    }  
    public static String decode(File file) 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<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();  
        hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");  
        result = new MultiFormatReader().decode(bitmap, hints);  
        return result != null ? result.getText() : null;  
    }  
    public static void main(String[] args) throws Exception {
        QRCodeUtils.encode("https://www.suibibk.com/blog/579412311547052032/582955445098905600/639208466002477056", "e:/logo.jpg", "e:/qrcode.png");
        // 解析二维码存储的内容并打印
        System.out.println(decode(new File("e:/qrcode.png")));
    }
}

若不需要logo就不需要传递