springboot集成zxing生成二维码demo

1.引入依赖

<!-- 二维码解析需要 -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.5.3</version>
</dependency>

2.编写Controller层代码

import com.google.zxing.BinaryBitmap;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.multipart.MultipartFile;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@RestController
@RequestMapping("/qrlogin")
public class QrLoginController {

    // 二维码解析接口
    @PostMapping("/decode")
    public Map<String, String> decodeQrCode(@RequestPart("file") MultipartFile file) {
        Map<String, String> resultMap = new HashMap<>();

        try {
            // 将MultipartFile转成BufferedImage
            BufferedImage bufferedImage = ImageIO.read(file.getInputStream());

            // 使用ZXing解析二维码
            BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(
                    new BufferedImageLuminanceSource(bufferedImage)));
            Result result = new MultiFormatReader().decode(binaryBitmap);

            resultMap.put("status", "success");
            resultMap.put("content", result.getText());

        } catch (Exception e) {
            resultMap.put("status", "error");
            resultMap.put("message", "解析二维码失败：" + e.getMessage());
        }

        return resultMap;
    }

    // 你的原本生成二维码的接口保持不变
    @GetMapping("/generate")
    public void generateQrCode(@RequestParam(required = false) String rand, HttpServletResponse response)
            throws IOException, WriterException {

        String uuid = UUID.randomUUID().toString();
        String qrContent = "https://your-app-domain/login?uuid=" + uuid;
        System.out.println(uuid);
        int width = 300;
        int height = 300;
        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

        BitMatrix bitMatrix = new MultiFormatWriter()
                .encode(qrContent, BarcodeFormat.QR_CODE, width, height, hints);

        response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
        response.setHeader("Pragma", "no-cache");
        response.setHeader("Expires", "0");
        response.setContentType("image/png");

        MatrixToImageWriter.writeToStream(bitMatrix, "PNG", response.getOutputStream());
    }
}

3.二维码生成

4.二维码解析

保存生成二维码，图片上传到解析接口

5.控制台对比解析二维码是否正确