普通二维码生成

ゝ一纸荒年。 2022-06-09 14:10 166阅读 0赞

依赖：ZXing-core-3.2.1.jar  
1、二维码生成

import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.io.OutputStream;
    
    import javax.imageio.ImageIO;
    
    import com.google.zxing.common.BitMatrix;
    
    /* * 生成二维码 */
    public class MatrixToImageWriter { 
    
        private static final int BLACK = 0xFF000000;
        private static final int WHITE = 0xFFFFFFFF;
    
        private MatrixToImageWriter() {
        }
    
        public static BufferedImage toBufferedImage(BitMatrix matrix) {
            int width = matrix.getWidth();
            int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE);
                }
            }
            return image;
        }
    
        public static void writeToFile(BitMatrix matrix, String format, File file)throws IOException {
            BufferedImage image = toBufferedImage(matrix);
            if (!ImageIO.write(image, format, file)) {
                throw new IOException("Could not write an image of format "+ format + " to " + file);
            }
        }
    
        public static void writeToStream(BitMatrix matrix, String format,OutputStream stream) throws IOException {
            BufferedImage image = toBufferedImage(matrix);
            if (!ImageIO.write(image, format, stream)) {
                throw new IOException("Could not write an image of format "+ format);
            }
        }
    }

2、解析二维码

import java.awt.Graphics2D;
    import java.awt.geom.AffineTransform;
    import java.awt.image.BufferedImage;
    
    import com.google.zxing.LuminanceSource;
    
    /* * 解析二维码： */
    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) {
                        image.setRGB(x, y, 0xFFFFFFFF); // = white
                    }
                }
            }
    
            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);
        }
    
    }

3、解析输出二维码信息

import java.awt.image.BufferedImage;
    import java.io.File;
    import java.util.HashMap;
    import java.util.Map;
    
    import javax.imageio.ImageIO;
    
    import com.google.zxing.Binarizer;
    import com.google.zxing.BinaryBitmap;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.LuminanceSource;
    import com.google.zxing.MultiFormatReader;
    import com.google.zxing.Result;
    import com.google.zxing.common.HybridBinarizer;
    
    import erWeiMa.BufferedImageLuminanceSource;
    
    public class jiexi {
        public static void main(String[] args) {
            try {
                MultiFormatReader formatReader = new MultiFormatReader();
                String filePath = "C:\\Users\\zk\\Desktop\\qrCode.jpg";
                File file = new File(filePath);
                BufferedImage image = ImageIO.read(file);
                LuminanceSource source = new BufferedImageLuminanceSource(image);
                Binarizer binarizer = new HybridBinarizer(source);
                BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
                Map hints = new HashMap();
                hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
                Result result = formatReader.decode(binaryBitmap, hints);
    
                System.out.println("result = " + result.toString());
                System.out.println("resultFormat = " + result.getBarcodeFormat());
                System.out.println("resultText = " + result.getText());
    
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

4、生成二维码图片

import java.io.File;
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.WriterException;
    import com.google.zxing.common.BitMatrix;
    
    import erWeiMa.MatrixToImageWriter;
    
    /* * 二维码生成 */
    public class main {
        public static void main(String[] args) {
            try {  
                String content = "http://www.baidu.com"; 
                String path = "C:\\Users\\zk\\Desktop"; 
    
                MultiFormatWriter multiFormatWriter = new MultiFormatWriter(); 
    
                Map hints = new HashMap(); 
                hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); 
                BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400, hints); 
                File file1 = new File(path, "qrCode.jpg"); 
                MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1); 
            } catch (WriterException e) {  
                e.printStackTrace(); 
            } catch (IOException e) {  
                e.printStackTrace(); 
            } 
        }
    }