Google Zxing二维码生成与解析使用实例

小灰灰 2022-04-23 08:12 178阅读 0赞

应项目需求，现需要生成二维码功能，之前没怎么接触过这个知识点，上网狂搜，原来生成二维码的开源项目可谓是琳琅满目，SwetakeQRCode、BarCode4j、Qrcode、Zxing......

最后选择用Google Zxing，只所以选择Zxing，是因为Google龙头公司值得信赖。

废话不多说了，直接上代码

一、添加pom.xml依赖

<dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.3.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>javase</artifactId>
        <version>3.3.0</version>
    </dependency>

二、二维码工具类

package com.fintech.common.utils;
    
    import com.google.zxing.*;
    import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
    import com.google.zxing.client.j2se.MatrixToImageWriter;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.common.HybridBinarizer;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import javax.imageio.ImageIO;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.FileInputStream;
    import java.nio.file.FileSystems;
    import java.nio.file.Path;
    import java.util.HashMap;
    import java.util.Map;
    
    /**
     * 二维码工具类
     */
    public class ZxingUtil {
    
        private static Logger logger = LoggerFactory.getLogger(ZxingUtil.class);
    
        /**
         * 生成二维码
         * @param text  内容
         * @param dir   图像路径
         * @throws Exception
         */
        public static String createQrcode(String text, String dir) throws Exception {
            String result = "";
            logger.info("生成二维码开始，内容：{}，路径：{}",text, dir );
            String content = text;  // 内容
            int width = 300;    // 图像宽度
            int height = 300;   // 图像高度
            String format = "png";  // 图像类型
            try{
                Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
                hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
                BitMatrix bitMatrix = new MultiFormatWriter().encode(content,BarcodeFormat.QR_CODE, width, height, hints);  // 生成矩阵
                File file = new File(dir);
                if(!file.exists()){
                    file.mkdir();
                }
                Path path = FileSystems.getDefault().getPath(dir + "//" + System.currentTimeMillis() + "." + format);
                MatrixToImageWriter.writeToPath(bitMatrix, format, path);   // 输出图像
                result = path.toString();
                logger.info("生成二维码成功，路径：{}", result);
            }catch (Exception e){
                throw new Exception("生成二维码异常！");
            }
            return result;
        }
    
        /**
         * 解析二维码
         * @param path 路径
         * @return
         * @throws Exception
         */
        public static String decodeQrcode(String path) throws Exception {
            logger.info("解析二维码开始，路径：{}", path);
            String retStr = "";
            if ("".equalsIgnoreCase(path) && path.length() == 0) {
                return "解析二维码路径为空!";
            }
            try {
                BufferedImage bufferedImage = ImageIO.read(new FileInputStream(path));
                LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
                Binarizer binarizer = new HybridBinarizer(source);
                BinaryBitmap bitmap = new BinaryBitmap(binarizer);
                HashMap<DecodeHintType, Object> hintTypeObjectHashMap = new HashMap<>();
                hintTypeObjectHashMap.put(DecodeHintType.CHARACTER_SET, "UTF-8");
                Result result = new MultiFormatReader().decode(bitmap, hintTypeObjectHashMap);
                retStr = result.getText();
                logger.info("解析二维码成功，内容：{}", retStr);
            } catch (Exception e) {
                throw new Exception("解析二维码异常！");
            }
            return retStr;
        }
    
        public static void main(String[] args) throws Exception {
            createQrcode("https://blog.csdn.net/u010688241/article/details/82866135","D://qrcode");
            decodeQrcode("D:\\qrcode\\1548740566253.png");
        }
    }