Java生成中间logo的二维码(还可以加上二维码名称哦)

x33g5p2x  于2021-03-13 发布在 Go  
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最近有负责微信开发,对于微信开发的项目,肯定少不了二维码啦,正好有个这样的需求,这对不同的商品生成一个二维码,扫码即刻下单。博主就弄了一个二维码生成的工具类。

弄出来之后,产品经理又说了,中间放上公司的logo是不是好一点?加上吧,

加上公司logo之后,产品经理想了想,每个商品都有个二维码,销售人员有很多个商品二维码,群发给用户,在qq群上,微信群上,怎么知道哪个二维码对应哪个商品的呢?于是决定要加上商品名称。最后商品二维码就成了下面这个模样了(当然啦,这里面的logo并不是博主现职公司的)。

这里写图片描述

效果已经出来啦,下面附上代码啦

如果读者不需要logo或者二维码名称的,读懂代码后进行删减即可。注释多多,还是很容易看懂的。

package com.luo.wctweb.util;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
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;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
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 com.lz.lsf.util.Base64;

/**  
 * @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  
        {  
            getLogoQRCode("https://www.baidu.com/", null, "跳转到百度的二维码");
        }  
        catch (Exception e)  
        {  
            e.printStackTrace();  
        }  
    }  

    /**
     * 生成带logo的二维码图片
     *
     * @param qrPic
     * @param logoPic
     */
    public static String getLogoQRCode(String qrUrl,HttpServletRequest request,String productName)
    {
//      String filePath = 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 = "C:/Users/luoguohui/Desktop/78310a55b319ebc4fa3aef658126cffc1f17168f.jpg";  //TODO  
        String content = qrUrl;
        try
        {  
            ZXingCode zp = new ZXingCode();
            BufferedImage bim = zp.getQR_CODEBufferedImage(content, BarcodeFormat.QR_CODE, 400, 400, zp.getDecodeHintType());
            return zp.addLogo_QRCode(bim, new File(filePath), new LogoConfig(), productName);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 给二维码图片添加Logo
     *
     * @param qrPic
     * @param logoPic
     */
    public String addLogo_QRCode(BufferedImage bim, File logoPic, LogoConfig logoConfig, String productName)
    {
        try
        {
            /**
             * 读取二维码图片,并构建绘图对象
             */
            BufferedImage image = bim;
            Graphics2D g = image.createGraphics();

            /**
             * 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();
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            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,因此下面的折行代码可以注释掉
            //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
            ImageIO.write(image, "png", new File("C:/Users/luoguohui/Desktop/TDC-" + new Date().getTime() + "test.png")); //TODO  

            String imageBase64QRCode =  Base64.byteArrayToBase64(baos.toByteArray());
            baos.close();
            return imageBase64QRCode;
        }
        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;
        }
    }

需要说明的是以上代码依赖了com.google.zxing这个插件,如果读者跟博主一样都是使用maven的话,添加下面依赖即可。
如果没有用maven的话,直接在http://maven.outofmemory.cn/com.google.zxing/core/3.1.0/ 下载。

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.1.0</version>
</dependency>

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