Java二维码图片识别

前言

后端识别二维码图片

代码

引入依赖

 <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.2.1</version>
        </dependency>

        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.3.3</version>
        </dependency>

编写工具类

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;


public class QrUtil {

    public static String qrToText(File file) throws IOException {
        BufferedImage read = ImageIO.read(file);
        String s = qrToText(read);
        return s;
    }

    public static String qrToText(String url) throws IOException {
        URL u = new URL(url);
        BufferedImage read = ImageIO.read(u);
        String s = qrToText(read);
        return s;
    }

    public static String qrToText(InputStream inputStream) throws IOException {
        BufferedImage read = ImageIO.read(inputStream);
        String s = qrToText(read);
        return s;
    }

    public static String qrToText(BufferedImage bufferedImage) {
        String content = null;
        try {
            LuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
            Binarizer binarizer = new HybridBinarizer(source);
            BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
            Map<DecodeHintType, Object> hints = new HashMap<>();
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
            Result result = new MultiFormatReader().decode(binaryBitmap, hints);
            content = result.getText();

        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return content;
    }
}

测试用例（qrtest.png为待解析的二维码），然后运行

 @Test
    public void testQr() throws IOException {
        String str = QrUtil.qrToText(new File("C:\\test\\qrtest.png"));
        System.out.println(str);
    }