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  • Java中如何生成二维码?

    Java中如何生成二维码?

     

     

    <!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.3.3</version>
    </dependency>
    

     

    • BufferedImageLuminanceSource 类
    import java.awt.Graphics2D;
    import java.awt.geom.AffineTransform;
    import java.awt.image.BufferedImage;
    import com.google.zxing.LuminanceSource;
    
    /**
     * @Author 刘路生
     */
    public class BufferedImageLuminanceSource extends LuminanceSource {
    
        private final BufferedImage image;
        private final int left;
        private final int top;
    
        public BufferedImageLuminanceSource(BufferedImage image) {
            this(image, 0, 0, image.getWidth(), image.getHeight());
        }
    
        public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
            super(width, height);
    
            int sourceWidth = image.getWidth();
            int sourceHeight = image.getHeight();
            if (left + width > sourceWidth || top + height > sourceHeight) {
                throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
            }
    
            for (int y = top; y < top + height; y++) {
                for (int x = left; x < left + width; x++) {
                    if ((image.getRGB(x, y) & 0xFF000000) == 0) {
                        //  white
                        image.setRGB(x, y, 0xFFFFFFFF);
                    }
                }
            }
    
            this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
            this.image.getGraphics().drawImage(image, 0, 0, null);
            this.left = left;
            this.top = top;
        }
    
        @Override
        public byte[] getRow(int y, byte[] row) {
            if (y < 0 || y >= getHeight()) {
                throw new IllegalArgumentException("Requested row is outside the image: " + y);
            }
            int width = getWidth();
            if (row == null || row.length < width) {
                row = new byte[width];
            }
            image.getRaster().getDataElements(left, top + y, width, 1, row);
            return row;
        }
    
        @Override
        public byte[] getMatrix() {
            int width = getWidth();
            int height = getHeight();
            int area = width * height;
            byte[] matrix = new byte[area];
            image.getRaster().getDataElements(left, top, width, height, matrix);
            return matrix;
        }
    
        @Override
        public boolean isCropSupported() {
            return true;
        }
    
        @Override
        public LuminanceSource crop(int left, int top, int width, int height) {
            return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
        }
        @Override
        public boolean isRotateSupported() {
            return true;
        }
        @Override
        public LuminanceSource rotateCounterClockwise() {
            int sourceWidth = image.getWidth();
            int sourceHeight = image.getHeight();
            AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
            BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
            Graphics2D g = rotatedImage.createGraphics();
            g.drawImage(image, transform, null);
            g.dispose();
            int width = getWidth();
            return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
        }
    
    }
    
    • QRCodeUtil 类
    import java.awt.BasicStroke;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    import java.awt.Image;
    import java.awt.Shape;
    import java.awt.geom.RoundRectangle2D;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.OutputStream;
    import java.util.Hashtable;
    import javax.imageio.ImageIO;
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.BinaryBitmap;
    import com.google.zxing.DecodeHintType;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.MultiFormatReader;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.Result;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.common.HybridBinarizer;
    import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
    
    /**
     * @Author 刘路生
     */
    public class QRCodeUtil {
            private static final String CHARSET = "UTF-8";
        private static final String FORMAT_NAME = "JPG";
        /**
         * 二维码尺寸
         */
        private static final int QRCODE_SIZE = 300;
        /**
         * LOGO宽度
         */
        private static final int WIDTH = 60;
        /**
         * LOGO高度
         */
        private static final int HEIGHT = 60;
    
        private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
            Hashtable hints = new Hashtable();
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
            hints.put(EncodeHintType.MARGIN, 1);
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
                    hints);
            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
            QRCodeUtil.insertImage(image, imgPath, needCompress);
            return image;
        }
    
        private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
            File file = new File(imgPath);
            if (!file.exists()) {
                System.err.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);
            if (needCompress) {
                // 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();
                // 绘制缩小后的图
                g.drawImage(image, 0, 0, null);
                g.dispose();
                src = image;
            }
            // 插入LOGO
            Graphics2D graph = source.createGraphics();
            int x = (QRCODE_SIZE - width) / 2;
            int y = (QRCODE_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 void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
            BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
            mkdirs(destPath);
            // String file = new Random().nextInt(99999999)+".jpg";
            // ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
            ImageIO.write(image, FORMAT_NAME, new File(destPath));
        }
    
        public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
            BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
            return image;
        }
    
        public static void mkdirs(String destPath) {
            File file = new File(destPath);
            // 当文件夹不存在时,mkdirs会自动创建多层目录,区别于mkdir.(mkdir如果父目录不存在则会抛出异常)
            if (!file.exists() && !file.isDirectory()) {
                file.mkdirs();
            }
        }
    
        public static void encode(String content, String imgPath, String destPath) throws Exception {
            QRCodeUtil.encode(content, imgPath, destPath, false);
        }
    
        // 被注释的方法
        /*
         * public static void encode(String content, String destPath, boolean
         * needCompress) throws Exception { QRCodeUtil.encode(content, null, destPath,
         * needCompress); }
         */
    
        public static void encode(String content, String destPath) throws Exception {
            QRCodeUtil.encode(content, null, destPath, false);
        }
    
        public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
                throws Exception {
            BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
            ImageIO.write(image, FORMAT_NAME, output);
        }
    
        public static void encode(String content, OutputStream output) throws Exception {
            QRCodeUtil.encode(content, null, output, false);
        }
    
        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 hints = new Hashtable();
            hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
            result = new MultiFormatReader().decode(bitmap, hints);
            String resultStr = result.getText();
            return resultStr;
        }
    
        public static String decode(String text, String imgPath, String path, boolean b) throws Exception {
            return QRCodeUtil.decode(new File(path));
        }
    }
    

     

    • 纯二维码图片
    @Test
    public void testQRCode(){
        //二维码内容
        String text = "我是小明同学";
        //插图路径
        String imgPath = null;
        //生成的二维码路径
        String destPath = "D:/QRCode.JPG";
        try {
            //生成二维码(true代表插入的图片需要压缩)
            QRCodeUtil.encode(text, imgPath, destPath, true);
            //解码二维码
            System.out.println(QRCodeUtil.decode(new File(destPath)));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    • 结果

    Java中如何生成二维码?插图

    • 带插图的二维码图片
    @Test
    public void testQRCode(){
        //二维码内容(如果二维码内容为网址,则扫码后直接跳转到该网址)
        String text = "https://quicklyweb.cn/swagger-ui.html";
        //插图路径
        String imgPath = "D:/logo.PNG";
        //生成的二维码路径
        String destPath = "D:/QRCode.JPG";
        try {
        	//生成二维码(true代表插入的图片需要压缩)
            QRCodeUtil.encode(text, imgPath, destPath, true);
            //解码二维码
            System.out.println(QRCodeUtil.decode(new File(destPath)));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
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