Java中利用ZXing生成二维码

ZXing是一个开放源码的，用Java实现的多种格式的1D/2D条码图像处理库，它包含了联系到其他语言的端口。Zxing可以实现使用手机的内置的摄像头完成条形码的扫描及解码。该项目可实现的条形码编码和解码。ZXing类库支持以下几个功能：核心代码的使用、适用于J2SE客户端的版本、适用于Android客户端的版本。下面我简单介绍一下如何使用java利用ZXing生成二维码与解码。

1、二维码生成

1、将Zxing-core.jar 包加入到classpath下。

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。

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);
     }
   }
 
 }

3、生成二维码的实现

 String content = "123456789";
     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,"哈哈.jpg");
     MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1);

运行即可生成二维码，保存到本地。
2、二维码解析

1、 将Zxing-core.jar 包加入到classpath下。　　

2、 和生成一样，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

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);
   }
 
 }

3 编写解析二维码的实现代码

  <span style="white-space:pre">	</span> 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());

OK，利用ZXing生成与解析为二维码的实现基本完成，主要是自己记录备忘而已，不要太认真，同时也能方便有需要的有缘人。