Java 通过Zxing生成二维码
１．基本类提供二维码生成工具类
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 < 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 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．调用工具方法获取图片的二进制
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;
/**
* @author maybo
*
*/
public class QrCodeGenerator {
public static byte[] build(String content) throws IOException, WriterException {
int width = 300;
int height = 300;
//��ά���ͼƬ��ʽ
String format = "gif";
Hashtable hints = new Hashtable();
//������ʹ�ñ���
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
BarcodeFormat.QR_CODE, width, height, hints);
return MatrixToImageWriter.writeToStream(bitMatrix, format);