Java 通过Zxing生成二维码

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);

    }

}