生成二维码工具类

package com.market.Utils;


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;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * @Description: (二维码)
 * @author：luoguohui
 * @date：2015-10-29 下午05:27:13
 */
public class ZXingCode {
    private static final int QRCOLOR = 0xFF000000;   //默认是黑色
    private static final int BGWHITE = 0xFFFFFFFF;   //背景颜色

    public static void main(String[] args) throws WriterException {
        try {

            //BufferedImage  bigQr=new BufferedImage();
            //BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
            QRCodeAddLogo("D://二维码//008.jpg","D://二维码//1512705326.png","","D://baiducom//");
            //System.out.println(getLogoQRCode("https://www.baidu.com/", "跳转到百度的二维码", "", "D://baiducom//"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     *
     * @param logoUrl logo路径
     * @param QrUrl  二维码路径
     * @param productName 名称
     * @param qrCodeUrl 保存路径
     * @return 新二维码名称
     */

    public static String QRCodeAddLogo(String logoUrl,String QrUrl,String productName,String qrCodeUrl){

        String filePath = logoUrl;  //TODO
        try {
            ZXingCode zp = new ZXingCode();
            BufferedImage bim = ImageIO.read(new File(QrUrl));
            File LogoFile = null;
            if (filePath != null && !filePath.equals("")) {
                LogoFile = new File(filePath);
            }
            return zp.addLogo_QRCode(bim, LogoFile, new LogoConfig(), productName, qrCodeUrl);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 生成带logo的二维码图片
     *
     * @param content     要生成的内容
     * @param logoPic   二维码名称
     * @param logoUrl   logo的路径
     * @param qrCodeUrl 要保存二维码文件的父目录
     */
    public static String getLogoQRCode(String content, String productName, String logoUrl, String qrCodeUrl) {
//      String filePath = (javax.servlet.http.HttpServletRequest)request.getSession().getServletContext().getRealPath("/") + "resources/images/logoImages/llhlogo.png";
        //filePath是二维码logo的路径，但是实际中我们是放在项目的某个路径下面的，所以路径用上面的，把下面的注释就好
        String filePath = logoUrl;  //TODO
        try {
            ZXingCode zp = new ZXingCode();
            BufferedImage bim = zp.getQR_CODEBufferedImage(content, BarcodeFormat.QR_CODE, 400, 400, zp.getDecodeHintType());
            File LogoFile = null;
            if (filePath != null && !filePath.equals("")) {
                LogoFile = new File(filePath);
            }

            return zp.addLogo_QRCode(bim, LogoFile, new LogoConfig(), productName, qrCodeUrl);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 给二维码图片添加Logo
     *
     * @param qrPic
     * @param logoPic
     * @param productName 二维码名称
     *                    return 二维码名称
     */
    public String addLogo_QRCode(BufferedImage bim, File logoPic, LogoConfig logoConfig, String productName, String qrUrl) {
        try {
            /**
             * 读取二维码图片，并构建绘图对象
             */
            BufferedImage image = bim;
            Graphics2D g = image.createGraphics();
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            if (logoPic != null) {
                /**
                 * 读取Logo图片
                 */
                BufferedImage logo = ImageIO.read(logoPic);
                /**
                 * 设置logo的大小,本人设置为二维码图片的20%,因为过大会盖掉二维码
                 */
                int widthLogo = logo.getWidth(null) > image.getWidth() * 3 / 10 ? (image.getWidth() * 3 / 10) : logo.getWidth(null),
                        heightLogo = logo.getHeight(null) > image.getHeight() * 3 / 10 ? (image.getHeight() * 3 / 10) : logo.getWidth(null);

                /**
                 * logo放在中心
                 */
                int x = (image.getWidth() - widthLogo) / 2;
                int y = (image.getHeight() - heightLogo) / 2;
                /**
                 * logo放在右下角
                 *  int x = (image.getWidth() - widthLogo);
                 *  int y = (image.getHeight() - heightLogo);
                 */

                //开始绘制图片
                g.drawImage(logo, x, y, widthLogo, heightLogo, null);
//            g.drawRoundRect(x, y, widthLogo, heightLogo, 15, 15);
//            g.setStroke(new BasicStroke(logoConfig.getBorder()));
//            g.setColor(logoConfig.getBorderColor());
//            g.drawRect(x, y, widthLogo, heightLogo);
                g.dispose();

                //把商品名称添加上去，商品名称不要太长哦，这里最多支持两行。太长就会自动截取啦
                if (productName != null && !productName.equals("")) {
                    //新的图片，把带logo的二维码下面加上文字
                    BufferedImage outImage = new BufferedImage(400, 445, BufferedImage.TYPE_4BYTE_ABGR);
                    Graphics2D outg = outImage.createGraphics();
                    //画二维码到新的面板
                    outg.drawImage(image, 0, 0, image.getWidth(), image.getHeight(), null);
                    //画文字到新的面板
                    outg.setColor(Color.BLACK);
                    outg.setFont(new Font("宋体", Font.BOLD, 30)); //字体、字型、字号
                    int strWidth = outg.getFontMetrics().stringWidth(productName);
                    if (strWidth > 399) {
//                  //长度过长就截取前面部分
//                  outg.drawString(productName, 0, image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 5 ); //画文字
                        //长度过长就换行
                        String productName1 = productName.substring(0, productName.length() / 2);
                        String productName2 = productName.substring(productName.length() / 2, productName.length());
                        int strWidth1 = outg.getFontMetrics().stringWidth(productName1);
                        int strWidth2 = outg.getFontMetrics().stringWidth(productName2);
                        outg.drawString(productName1, 200 - strWidth1 / 2, image.getHeight() + (outImage.getHeight() - image.getHeight()) / 2 + 12);
                        BufferedImage outImage2 = new BufferedImage(400, 485, BufferedImage.TYPE_4BYTE_ABGR);
                        Graphics2D outg2 = outImage2.createGraphics();
                        outg2.drawImage(outImage, 0, 0, outImage.getWidth(), outImage.getHeight(), null);
                        outg2.setColor(Color.BLACK);
                        outg2.setFont(new Font("宋体", Font.BOLD, 30)); //字体、字型、字号
                        outg2.drawString(productName2, 200 - strWidth2 / 2, outImage.getHeight() + (outImage2.getHeight() - outImage.getHeight()) / 2 + 5);
                        outg2.dispose();
                        outImage2.flush();
                        outImage = outImage2;
                    } else {
                        outg.drawString(productName, 200 - strWidth / 2, image.getHeight() + (outImage.getHeight() - image.getHeight()) / 2 + 12); //画文字
                    }
                    outg.dispose();
                    outImage.flush();
                    image = outImage;
                }
                logo.flush();
                image.flush();
                baos.flush();
                ImageIO.write(image, "png", baos);
            }

            //二维码生成的路径，但是实际项目中，我们是把这生成的二维码显示到界面上的，因此下面的这个行代码可以注释掉
            //可以看到这个方法最终返回的是这个二维码的imageBase64字符串
            //前端用 <img src="data:image/png;base64,${imageBase64QRCode}"/>  其中${imageBase64QRCode}对应二维码的imageBase64字符串
            File qrImg = new File(qrUrl + new Date().getTime() + ".png");
            if (!qrImg.getParentFile().exists())
                qrImg.getParentFile().mkdirs();
            if (!qrImg.exists()) {
                qrImg.createNewFile();
            }
            ImageIO.write(image, "png", qrImg); //TODO

            //String imageBase64QRCode = Base64.encodeBase64URLSafeString(baos.toByteArray());

            baos.close();
            return qrImg.getName();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }


    /**
     * 构建初始化二维码
     *
     * @param bm
     * @return
     */
    public BufferedImage fileToBufferedImage(BitMatrix bm) {
        BufferedImage image = null;
        try {
            int w = bm.getWidth(), h = bm.getHeight();
            image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

            for (int x = 0; x < w; x++) {
                for (int y = 0; y < h; y++) {
                    image.setRGB(x, y, bm.get(x, y) ? 0xFF000000 : 0xFFCCDDEE);
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        return image;
    }

    /**
     * 生成二维码bufferedImage图片
     *
     * @param content       编码内容
     * @param barcodeFormat 编码类型
     * @param width         图片宽度
     * @param height        图片高度
     * @param hints         设置参数
     * @return
     */
    public BufferedImage getQR_CODEBufferedImage(String content, BarcodeFormat barcodeFormat, int width, int height, Map<EncodeHintType, ?> hints) {
        MultiFormatWriter multiFormatWriter = null;
        BitMatrix bm = null;
        BufferedImage image = null;
        try {
            multiFormatWriter = new MultiFormatWriter();
            // 参数顺序分别为：编码内容，编码类型，生成图片宽度，生成图片高度，设置参数
            bm = multiFormatWriter.encode(content, barcodeFormat, width, height, hints);
            int w = bm.getWidth();
            int h = bm.getHeight();
            image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

            // 开始利用二维码数据创建Bitmap图片，分别设为黑（0xFFFFFFFF）白（0xFF000000）两色
            for (int x = 0; x < w; x++) {
                for (int y = 0; y < h; y++) {
                    image.setRGB(x, y, bm.get(x, y) ? QRCOLOR : BGWHITE);
                }
            }
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return image;
    }

    /**
     * 设置二维码的格式参数
     *
     * @return
     */
    public Map<EncodeHintType, Object> getDecodeHintType() {
        // 用于设置QR二维码参数
        Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
        // 设置QR二维码的纠错级别（H为最高级别）具体级别信息
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 设置编码方式
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.MARGIN, 0);
        hints.put(EncodeHintType.MAX_SIZE, 350);
        hints.put(EncodeHintType.MIN_SIZE, 100);

        return hints;
    }
}

class LogoConfig {
    // logo默认边框颜色
    public static final Color DEFAULT_BORDERCOLOR = Color.WHITE;
    // logo默认边框宽度
    public static final int DEFAULT_BORDER = 2;
    // logo大小默认为照片的1/5
    public static final int DEFAULT_LOGOPART = 5;

    private final int border = DEFAULT_BORDER;
    private final Color borderColor;
    private final int logoPart;

    /**
     * Creates a default config with on color {@link #BLACK} and off color
     * {@link #WHITE}, generating normal black-on-white barcodes.
     */
    public LogoConfig() {
        this(DEFAULT_BORDERCOLOR, DEFAULT_LOGOPART);
    }

    public LogoConfig(Color borderColor, int logoPart) {
        this.borderColor = borderColor;
        this.logoPart = logoPart;
    }

    public Color getBorderColor() {
        return borderColor;
    }

    public int getBorder() {
        return border;
    }

    public int getLogoPart() {
        return logoPart;
    }
}