Java利用Zxing生成二维码的简单实例

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);   }  }  }

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(); }

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);  }  }

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();     }