最近工作中经常要用到QrCode二维码，研究了一下，写了个带圆角LOGO的JAVA实现，QrCode之所以能在中间放个LOGO图标，是因为编码时的信息冗余。实现的具体代码如下：

方法接口：

import java.io.File;
import java.io.OutputStream;

public interface QRCodeService {

    public void generateToStream(String code, OutputStream stream);
    
    public void generateToStream(String code, OutputStream stream, int width);
    
    public void generateToStream(String code, OutputStream stream, int width, int frontColor);
    
    public void generateToStream(String code, OutputStream stream, int width, int frontColor, File logo);
}

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

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;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;


@Service("qrCodeService")
public class QRCodeServiceImpl implements QRCodeService {

    private static final Logger LOGGER = LoggerFactory.getLogger(QRCodeServiceImpl.class);
    // 二维码的宽
    private static int WIDTH = 250;
    // 中间图片的宽
    private static int IMGWIDTH = 60;
    // 圆角半径
    private static int RADIUS = 10;
    // 留白填充宽度
    private static int MARGIN = 4;
    
    private static int FRONTCOLOR = 0x00000000;//0x00808080;
    
    /**
     * 功能描述：生成普通二维码到输出流
     */
    @Override
    public void generateToStream(String code, OutputStream stream) {
        this.generateToStream(code, stream, WIDTH, FRONTCOLOR, null);
    }
    
    @Override
    public void generateToStream(String code, OutputStream stream, int width) {
        this.generateToStream(code, stream, width, FRONTCOLOR, null);
    }

    @Override
    public void generateToStream(String code, OutputStream stream, int width, int frontColor) {
        this.generateToStream(code, stream, width, frontColor, null);
    }

    @Override
    public void generateToStream(String code, OutputStream stream, int width, int frontColor, File logo) {
        Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        // 修正容量高
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 边框留白
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix matrix = null;
        try {
            matrix = new MultiFormatWriter().encode(code, BarcodeFormat.QR_CODE, width, width, hints);
        } catch (WriterException e) {
            LOGGER.error("", e);
        }
        proc(matrix, stream, frontColor, logo);
    }

    public void proc(BitMatrix matrix, OutputStream stream, int frontColor, File logo) {
        int width = matrix.getWidth();
        // 处理后图片的数据
        int pixels[] = new int[width * width];
        // 中间图片数组数据
        int src[][] = null;
        boolean hashlogo = false;
        if(logo != null){
            src = http://www.mamicode.com/getPic(logo);>控制器类：
@Controller
@RequestMapping("")
public class QrCodeController {
    
    private static final Logger LOGGER = LoggerFactory.getLogger(QrCodeController.class);

    @Resource(name = "qrCodeService")
    QRCodeService qrCodeService;
    
    @RequestMapping("qrcode")
    public void generateQrCode(HttpServletRequest request,HttpServletResponse response){
        try {
            String code = request.getParameter("url");
            if(StringUtils.isBlank(code)){
                LOGGER.error("url is null");
                return;
            }
            String width = request.getParameter("width");
            String color = request.getParameter("color");
            String logo = request.getParameter("logo");
            OutputStream os = response.getOutputStream();
            if (StringUtils.isNotBlank(width) && StringUtils.isNotBlank(color) && StringUtils.isNotBlank(logo)){
                int my_width = Integer.valueOf(width);
                int my_color = Integer.valueOf(color);
                //int my_logo = Integer.valueOf(logo);
                LOGGER.info("hash logo");
                File logofile = new File("logo.jpg");
                qrCodeService.generateToStream(code, os, my_width, my_color, logofile);
            } else if (StringUtils.isNotBlank(width) && StringUtils.isNotBlank(color)){
                int my_width = Integer.valueOf(width);
                int my_color = Integer.valueOf(color);
                qrCodeService.generateToStream(code, os, my_width, my_color);
            } else if(StringUtils.isNotBlank(width)) {
                int my_width = Integer.valueOf(width);
                qrCodeService.generateToStream(code, os, my_width);
            } else {
                qrCodeService.generateToStream(code, os);
            }
            os.flush();
            os.close();
            LOGGER.info("generate qrcode succeed");
        } catch (IOException e) {
            LOGGER.error("generate qrcode error : ", e);
        }
    }
    
}
生成效果：

带圆角LOGO的QrCode二维码实时生成