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Java利用Zxing生成二维码的简单实例

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Zxing是Google提供的关于条码(一维码、二维码)的解析工具,提供了二维码的生成与解析的方法,现在我简单介绍一下使用Java利用Zxing生成与解析二维码 。

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.

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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 。

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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 。

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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 。

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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,主要为自己做备忘,同时方便有需要的人。呵呵! 。

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