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Java利用Zxing生成二维码详解

itxm 2018年06月22日 手机开发 363 0
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, 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,主要为自己做备忘,同时方便有需要的人。呵呵!

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