Java借助Zxing生成二维码，java借助zxing,1、二维码的生成 1.1

Java借助Zxing生成二维码，java借助zxing,1、二维码的生成 1.1

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) &amp; 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