Java利用Zxing生成二維碼

Zxing是Google提供的關于條碼（一維碼、二維碼）的解析工具，提供了二維碼的生成與解析的方法，現在我簡單介紹一下使用Java利用Zxing生成與解析二維碼
Zxing項目地址： https://code.google.com/p/zxing/
1、二維碼的生成

  1.1 將Zxing-core.jar 包加入到classpath下。

 1.2 二維碼的生成需要借助MatrixToImageWriter類，該類是由Google提供的，可以將該類拷貝到源碼中，這里我將該類的源碼貼上，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);
     }
   }
}
</pre> 

 1.3 編寫生成二維碼的實現代碼


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,"餐巾紙.jpg");
 MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1);


} catch (Exception e) {
     e.printStackTrace();
 }
</pre> 

 現在運行后即可生成一張二維碼圖片，是不是很簡單啊？ 接下來我們看看如何解析二維碼

 

 2、二維碼的解析

 

 2.1 將Zxing-core.jar 包加入到classpath下。 

 

 2.2 和生成一樣，我們需要一個輔助類（ BufferedImageLuminanceSource），同樣該類Google也提供了，這里我同樣將該類的源碼貼出來，可以直接拷貝使用個，省去查找的麻煩


　　

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);

}
}
</pre> 

 

 2.3 編寫解析二維碼的實現代碼

 


　

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();
     }


</pre> 

 

  現在運行后可以看到控制臺打印出了二維碼的內容。

 

 到此為止，利用Zxing生成和解析二維碼就講述演示完畢，主要為自己做備忘，同時方便有需要的人。呵呵！