| |
Java generate two-dimensional code by Zxing
1. Basic class provides two-dimensional code generation tools
package com.green.util;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import com.google.zxing.common.BitMatrix;
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
for (int y = 0; 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 byte [] writeToStream (BitMatrix matrix, String format) throws IOException {
ByteArrayOutputStream stream = new ByteArrayOutputStream ();
BufferedImage image = toBufferedImage (matrix);
if (! ImageIO.write (image, format, stream)) {
throw new IOException ( "Could not write an image of format" + format);
}
return stream.toByteArray ();
}
}
2. Call the utility method to obtain a binary image
package com.green.util;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
/ **
*
* /
public class QrCodeGenerator {
public static byte [] build (String content) throws IOException, WriterException {
int width = 300;
int height = 300;
String format = "gif";
Hashtable hints = new Hashtable ();
hints.put (EncodeHintType.CHARACTER_SET, "utf-8");
BitMatrix bitMatrix = new MultiFormatWriter (). Encode (content,
BarcodeFormat.QR_CODE, width, height, hints);
return MatrixToImageWriter.writeToStream (bitMatrix, format);
}
} |
|
|
|