java利用zxing生成二维码

梦里梦外; 2022-11-15 11:49 239阅读 0赞

> 什么是ZXing？
> 
> ZXing是一个开源的，用Java实现的多种格式的1D/2D条码图像处理库。

利用ZXing这个工具库来生成二维码，具体操作如下：

引入相关资源包

<dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.4.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>javase</artifactId>
        <version>3.4.0</version>
    </dependency>

编写工具类

package org.tianshun.common.utils;
    
    import com.google.zxing.*;
    import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.common.HybridBinarizer;
    import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
    
    import javax.imageio.ImageIO;
    import java.awt.*;
    import java.awt.geom.RoundRectangle2D;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.OutputStream;
    import java.util.Hashtable;
    import java.util.Random;
    
    /**
     * 生成二维码的工具类
     */
    public class QRCodeUtils {
    
        private static final String CHARSET = "utf-8";
        private static final String FORMAT_NAME = "JPG";
        // 二维码尺寸
        private static final int QRCODE_SIZE = 400;
        // LOGO宽度
        private static final int WIDTH = 60;
        // LOGO高度
        private static final int HEIGHT = 60;
    
        public static BufferedImage createImage(String content, String logoPath,
                                                boolean needCompress) 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);
                }
            }
            if (logoPath == null || "".equals(logoPath)) {
    
    
                return image;
            }
            // 插入图片
            QRCodeUtils.insertImage(image, logoPath, needCompress);
            return image;
        }
    
        /**
         * 插入LOGO
         *
         * @param source       二维码图片
         * @param imgPath      LOGO图片地址
         * @param needCompress 是否压缩
         * @throws Exception
         */
        private static void insertImage(BufferedImage source, String imgPath,
                                        boolean needCompress) throws Exception {
            File file = new File(imgPath);
            if (!file.exists()) {
                System.err.println("" + imgPath + "   该文件不存在！");
                return;
            }
            Image src = ImageIO.read(new File(imgPath));
            int width = src.getWidth(null);
            int height = src.getHeight(null);
            if (needCompress) { // 压缩LOGO
                if (width > WIDTH) {
                    width = WIDTH;
                }
                if (height > HEIGHT) {
                    height = HEIGHT;
                }
                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();
        }
    
        /**
         * 生成二维码(内嵌LOGO)
         *
         * @param content      内容
         * @param logoPath      LOGO地址
         * @param destPath     存放目录
         * @param needCompress 是否压缩LOGO
         * @throws Exception
         */
        public static String encode(String content, String logoPath, String destPath,
                                    boolean needCompress) throws Exception {
            BufferedImage image = QRCodeUtils.createImage(content, logoPath,
                    needCompress);
            mkdirs(destPath);
            String file = new Random().nextInt(99999999) + ".jpg";
            ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
            return file;
        }
    
        /**
         * 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
         *
         * @param destPath 存放目录
         * @date 2013-12-11 上午10:16:36
         */
        public static void mkdirs(String destPath) {
            File file = new File(destPath);
            //当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
            if (!file.exists() && !file.isDirectory()) {
                file.mkdirs();
            }
        }
    
        /**
         * 生成二维码(内嵌LOGO)
         *
         * @param content  内容
         * @param imgPath  LOGO地址
         * @param destPath 存储地址
         * @throws Exception
         */
        public static void encode(String content, String imgPath, String destPath)
                throws Exception {
            QRCodeUtils.encode(content, imgPath, destPath, false);
        }
    
        /**
         * 生成二维码
         *
         * @param content      内容
         * @param destPath     存储地址
         * @param needCompress 是否压缩LOGO
         * @throws Exception
         */
        public static void encode(String content, String destPath,
                                  boolean needCompress) throws Exception {
            QRCodeUtils.encode(content, null, destPath, needCompress);
        }
    
        /**
         * 生成二维码
         *
         * @param content  内容
         * @param destPath 存储地址
         * @throws Exception
         */
        public static void encode(String content, String destPath) throws Exception {
            QRCodeUtils.encode(content, null, destPath, false);
        }
    
        /**
         * 生成二维码(内嵌LOGO)
         *
         * @param content      内容
         * @param imgPath      LOGO地址
         * @param output       输出流
         * @param needCompress 是否压缩LOGO
         * @throws Exception
         */
        public static void encode(String content, String imgPath,
                                  OutputStream output, boolean needCompress) throws Exception {
            BufferedImage image = QRCodeUtils.createImage(content, imgPath,
                    needCompress);
            ImageIO.write(image, FORMAT_NAME, output);
        }
    
        /**
         * 生成二维码
         *
         * @param content 内容
         * @param output  输出流
         * @throws Exception
         */
        public static void encode(String content, OutputStream output)
                throws Exception {
            QRCodeUtils.encode(content, null, output, false);
        }
    
        /**
         * 解析二维码
         *
         * @param file 二维码图片
         * @return
         * @throws Exception
         */
        public static String decode(File file) throws Exception {
            BufferedImage image;
            image = ImageIO.read(file);
            if (image == null) {
                return null;
            }
            BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(
                    image);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
            Result result;
            Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
            hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
            result = new MultiFormatReader().decode(bitmap, hints);
            String resultStr = result.getText();
            return resultStr;
        }
    
        /**
         * 解析二维码
         *
         * @param path 二维码图片地址
         * @return
         * @throws Exception
         */
        public static String decode(String path) throws Exception {
            return QRCodeUtils.decode(new File(path));
        }
    
        public static void main(String[] args) throws Exception {
            String text ="www.baidu.com";
            String logoPath = "C:\\Users\\admin\\Desktop\\test\\test.jpg";
            String destPath = "D:\\";
            System.out.println(QRCodeUtils.encode(text, null, destPath, true));
        }
    }

执行main方法生成二维码图片并保存到本地相应位置。