Generate QRCode using Java

This is a little sample code to generate code using Java

You will need this class first

import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import com.google.zxing.LuminanceSource;

public final class BufferedImageLuminanceSource extends LuminanceSource {

      private final BufferedImage image;
      private final int left;
      private final int top;
      private int[] rgbData;

      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.");
        }

        this.image = image;
        this.left = left;
        this.top = top;
      }

      // These methods use an integer calculation for luminance derived from:
      // <code>Y = 0.299R + 0.587G + 0.114B</code>
     
      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];
        }

        if (rgbData == null || rgbData.length < width) {
          rgbData = new int[width];
        }
        image.getRGB(left, top + y, width, 1, rgbData, 0, width);
        for (int x = 0; x < width; x++) {
          int pixel = rgbData[x];
          int luminance = (306 * ((pixel >> 16) & 0xFF) +
              601 * ((pixel >> 8) & 0xFF) +
              117 * (pixel & 0xFF)) >> 10;
          row[x] = (byte) luminance;
        }
        return row;
      }

     
      public byte[] getMatrix() {
        int width = getWidth();
        int height = getHeight();
        int area = width * height;
        byte[] matrix = new byte[area];

        int[] rgb = new int[area];
        image.getRGB(left, top, width, height, rgb, 0, width);
        for (int y = 0; y < height; y++) {
          int offset = y * width;
          for (int x = 0; x < width; x++) {
            int pixel = rgb[offset + x];
            int luminance = (306 * ((pixel >> 16) & 0xFF) +
                601 * ((pixel >> 8) & 0xFF) +
                117 * (pixel & 0xFF)) >> 10;
            matrix[offset + x] = (byte) luminance;
          }
        }
        return matrix;
      }

     
      public boolean isCropSupported() {
        return true;
      }

     
      public LuminanceSource crop(int left, int top, int width, int height) {
        return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
      }

      // Can't run AffineTransforms on images of unknown format.
     
      public boolean isRotateSupported() {
        return image.getType() != BufferedImage.TYPE_CUSTOM;
      }

     
      public LuminanceSource rotateCounterClockwise() {
        if (!isRotateSupported()) {
          throw new IllegalStateException("Rotate not supported");
        }
        int sourceWidth = image.getWidth();
        int sourceHeight = image.getHeight();

        // Rotate 90 degrees counterclockwise.
        AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);

        // Note width/height are flipped since we are rotating 90 degrees.
        BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, image.getType());

        // Draw the original image into rotated, via transformation
        Graphics2D g = rotatedImage.createGraphics();
        g.drawImage(image, transform, null);
        g.dispose();

        // Maintain the cropped region, but rotate it too.
        int width = getWidth();
        return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width),
            getHeight(), width);
      }

    }

Now it's the main class

public class UsingZxingToWrite {

    // Change with other file directory
    private static final String FILENAME = "E:\\test.jpg";
    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    /**
     * Renders a {@link BitMatrix} as an image, where "false" bits are rendered
     * as white, and "true" bits are rendered as black.
     */
    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;
    }

    // In case the golden images are not monochromatic, convert the RGB values
    // to greyscale.
    private static BitMatrix createMatrixFromImage(BufferedImage image) {
        int width = image.getWidth();
        int height = image.getHeight();
        int[] pixels = new int[width * height];
        image.getRGB(0, 0, width, height, pixels, 0, width);

        BitMatrix matrix = new BitMatrix(width, height);
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                int pixel = pixels[y * width + x];
                int luminance = (306 * ((pixel >> 16) & 0xFF) + 601
                        * ((pixel >> 8) & 0xFF) + 117 * (pixel & 0xFF)) >> 10;
                if (luminance <= 0x7F) {
                    matrix.set(x, y);
                }
            }
        }
        return matrix;
    }

    public static void main(String[] args) {

        int w = 300;
        int h = 300;

        // get a byte matrix for the data
        BitMatrix bitMatrix;
        com.google.zxing.Writer writer = new MultiFormatWriter();
        try {
           
            bitMatrix = writer.encode(
                    "AIRWAYID892045",
                    //new String(contents, Charset.forName("ISO-8859-1")),
                    BarcodeFormat.QR_CODE, w, h);
        } catch (com.google.zxing.WriterException e) {
            // exit the method
            return;
        }

        File f = new File(FILENAME);
        BufferedImage image = toBufferedImage(bitMatrix);
        try {
            System.out.println("Generating... " + f.getAbsolutePath());

            ImageIO.write(image, "jpg", f);
            System.out.println("Done");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
       
        MultiFormatReader reader = new MultiFormatReader();

        BufferedImage capturedImage;
        try {
            capturedImage = ImageIO.read(new File(FILENAME));
           
            // creating luminance source
            LuminanceSource source = new BufferedImageLuminanceSource(capturedImage);
            BinaryBitmap bitmap = new BinaryBitmap(new  HybridBinarizer(source));

            Hashtable hints = new Hashtable(1);
            Vector formats = new Vector(1);

            formats.addElement(BarcodeFormat.QR_CODE);
            hints.put(DecodeHintType.POSSIBLE_FORMATS,formats);
           
            Result result;
            try {
                result = reader.decode(bitmap);
                System.out.println(result.getText());
            } catch (NotFoundException e) {
                e.printStackTrace();
            }
        } catch (IOException e1) {
            e1.printStackTrace();
        }
    }
}

Here's the sample output