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);	}}