Java利用Zxing產生二維碼的簡單實例

Zxing是Google提供的關於條碼（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

1.二維碼的產生

1.1 將Zxing-core.jar 套件加入到classpath下。

1.2 二維碼的產生需要藉助MatrixToImageWriter類，該類是由Google提供的，可以將該類拷貝到源碼中，這裡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);
   }
  }
  
 }

1.3 編寫產生二維碼的實作程式碼

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,"餐巾纸.jpg");
   MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1);
    
 } catch (Exception e) {
   e.printStackTrace();
 }

現在運作後即可產生一張二維碼圖片，是不是很簡單啊？ 接下來我們來看看如何解析二維碼

2、二維碼的解析

2.1 將Zxing-core.jar 套件加入到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，這裡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);
  }
  
 }

2.3編寫解析二維碼的實作程式碼

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();
     }

現在運行後可以看到控制台印出了二維碼的內容。

到此為止，利用Zxing產生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。

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