1、二维码的生成

1.1 将Zxing-core.jar 包加入到classpath下。

1.2; 二维码的生成需要借助MatrixToImageWriter类，该类是由Google提供的，可以将该类拷贝到源码中，这里我将该类的源码贴上，可以直接使用。

import com.google.zxing.common.BitMatrix;     import javax.imageio.ImageIO;   import java.io.File;   import java.io.OutputStream;   import java.io.IOException;   import java.awt.image.BufferedImage;     public final 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);       }     }     }  

1.3 编写生成二维码的实现代码

try {         String content = "120605181003;http://www.cnblogs.com/jtmjx";       String path = "C:/Users/Administrator/Desktop/testImage";         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,"餐巾纸.jpg");       MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1);     } catch (Exception e) {       e.printStackTrace();   }  

现在运行后即可生成一张二维码图片，是不是很简单啊？ 接下来我们看看如何解析二维码

2、二维码的解析

2.1 将Zxing-core.jar 包加入到classpath下。

2.2 和生成一样，我们需要一个辅助类（ BufferedImageLuminanceSource），同样该类Google也提供了，这里我同样将该类的源码贴出来，可以直接拷贝使用个，省去查找的麻烦

BufferedImageLuminanceSource    import com.google.zxing.LuminanceSource;     import java.awt.Graphics2D;   import java.awt.geom.AffineTransform;   import java.awt.image.BufferedImage;     public final 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);     }     }

2.3 编写解析二维码的实现代码

 try {                           MultiFormatReader formatReader = new MultiFormatReader();               String filePath = "C:/Users/Administrator/Desktop/testImage/test.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();           }  

现在运行后可以看到控制台打印出了二维码的内容。

到此为止，利用Zxing生成和解析二维码就讲述演示完毕