Java利用Zxing生成二维码

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
Zxing项目地址： https://code.google.com/p/zxing/
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,OutputStream stream)
       throws IOException {
     BufferedImage image = toBufferedImage(matrix);
     if (!ImageIO.write(image,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,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,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,0xFFFFFFFF); // = white
         }
       }
     }
 
     this.image = new BufferedImage(sourceWidth,sourceHeight,BufferedImage.TYPE_BYTE_GRAY);
     this.image.getGraphics().drawImage(image,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,matrix);
     return matrix;
   }
 
   @Override
   public boolean isCropSupported() {
     return true;
   }
 
   @Override
   public LuminanceSource crop(int left,int height) {
     return new BufferedImageLuminanceSource(image,this.left + left,this.top + top,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,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,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，主要为自己做备忘，同时方便有需要的人。呵呵！