java 工具类实现Base64二维码图片识别

上依赖

 
<dependency>
    <groupId>com.google.zxinggroupId>
    <artifactId>javaseartifactId>
    <version>3.2.1version>
dependency>
    
<dependency>
    <groupId>com.google.zxinggroupId>
    <artifactId>coreartifactId>
    <version>3.3.3version>
dependency>

上代码

/**
 * 作用：二维码识别（图片）
 * 类名：QRCodeTools
 **/
public class QRCodeTools {
    /**
     * 解析二维码解析,此方法是解析Base64格式二维码图片
     * baseStr:base64字符串,data:image/png;base64开头的
     */
    public static String deEncodeByBase64(String baseStr) {
        String content = null;
        BufferedImage image;
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] b=null;
        try {
            int i = baseStr.indexOf("data:image/png;base64,");
            baseStr = baseStr.substring(i+"data:image/png;base64,".length());//去掉base64图片的data:image/png;base64,部分才能转换为byte[]
 
            b = decoder.decodeBuffer(baseStr);//baseStr转byte[]
            ByteArrayInputStream byteArrayInputStream=new ByteArrayInputStream(b);//byte[] 转BufferedImage
            image = ImageIO.read(byteArrayInputStream);
            LuminanceSource source = new BufferedImageLuminanceSource(image);
            Binarizer binarizer = new HybridBinarizer(source);
            BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
            Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
            Result result = new MultiFormatReader().decode(binaryBitmap, hints);//解码
            System.out.println("图片中内容：  ");
            System.out.println("content： " + result.getText());
            content = result.getText();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (NotFoundException e) {
            e.printStackTrace();
        }
        return content;
    }
    /**
     * 解析二维码,此方法解析一个路径的二维码图片
     * path:图片路径
     */
    public static String deEncodeByPath(String path) {
        String content = null;
        BufferedImage image;
        try {
            image = ImageIO.read(new File(path));
            LuminanceSource source = new BufferedImageLuminanceSource(image);
            Binarizer binarizer = new HybridBinarizer(source);
            BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
            Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
            Result result = new MultiFormatReader().decode(binaryBitmap, hints);//解码
            System.out.println("图片中内容：  ");
            System.out.println("content： " + result.getText());
            content = result.getText();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (NotFoundException e) {
            e.printStackTrace();
        }
        return content;
    }
}