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   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);     }   }

java 二維碼 工具類