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  • 利用Java生成二维码

    1、利用Java生成带logo的二维码,以及可以改变二维码的颜色。

    导入连个包:javase-3.3.0.jar和core-3.3.0.jar

    2、代码:

    import java.awt.BasicStroke;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    import java.awt.Image;
    import java.awt.Shape;
    import java.awt.geom.RoundRectangle2D;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.util.Hashtable;
    
    import javax.imageio.ImageIO;
    
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
    
    /**
     * 二维码工具类
     * 
     */
    public class QRCodeUtil {
        private static final String CHARSET = "utf-8";
        private static final String FORMAT = "JPG";
    
        public static void main(String[] args) throws Exception {
            String text = "http://www.baidu.com";
            String finame=QRCodeUtil.encode(text, "/Users/zhangjinru/背景图/666.jpg", "/Users/zhangjinru", "qrcode", true,900,60);
            System.out.println(finame);
        }
        
        /**
         * 
         * @param content 二维码内容
         * @param logoPath logo图片的路径
         * @param destPath 二维码保存的文件夹
         * @param fileName 二维码名字
         * @param needCompress 是否压缩logo图片
         * @param qrcode_size 二维码大小
         * @param logo_size logo 大小
         * @return 返回生成二维码的路径
         * @throws Exception
         */
        public static String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress,int qrcode_size,int logo_size) throws Exception {
            BufferedImage image = createImage(content, logoPath, needCompress,qrcode_size,logo_size);
            File file = new File(destPath);
            if (!file.exists() && !file.isDirectory()) {
                file.mkdirs();
            }
            fileName = fileName.substring(0, fileName.indexOf(".")>0?fileName.indexOf("."):fileName.length())  + "." + FORMAT.toLowerCase();
            ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
            return destPath+File.separator+fileName;
        }
    
        private static BufferedImage createImage(String content, String logoPath, boolean needCompress,int qrcode_size,int logo_size) throws Exception {
            Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
            hints.put(EncodeHintType.MARGIN, 1);
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, qrcode_size, qrcode_size, hints);
            int width = bitMatrix.getWidth();
            int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);//改变二维码的颜色
                }
            }
            if (logoPath == null || "".equals(logoPath)) {
                return image;
            }
            // 插入图片
            QRCodeUtil.insertImage(image, logoPath, needCompress,qrcode_size,logo_size);
            return image;
        }
    
        private static void insertImage(BufferedImage source, String logoPath, boolean needCompress,int qrcode_size,int logo_size ) throws Exception {
            File file = new File(logoPath);
            if (!file.exists()) {
                throw new Exception("logo file not found.");
            }
            Image src = ImageIO.read(new File(logoPath));
            int width = src.getWidth(null);
            int height = src.getHeight(null);
            if (needCompress) { // 压缩LOGO
                if (width > logo_size) {
                    width = logo_size;
                }
                if (height > logo_size) {
                    height = logo_size;
                }
                Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
                BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
                Graphics g = tag.getGraphics();
                g.drawImage(image, 0, 0, null); // 绘制缩小后的图
                g.dispose();
                src = image;
            }
            // 插入LOGO
            Graphics2D graph = source.createGraphics();
            int x = (qrcode_size - width) / 2;
            int y = (qrcode_size - height) / 2;
            graph.drawImage(src, x, y, width, height, null);
            Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
            graph.setStroke(new BasicStroke(3f));
            graph.draw(shape);
            graph.dispose();
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/zhangjinru123/p/7995344.html
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