Example of how Java generates and decodes QR codes based on google zxing

This article mainly introduces Java QR code generation and decoding based on google zxing in detail. It has certain reference value. Interested friends can refer to it.

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1. Add Maven dependency (you need to upload the QR code image when decoding, so you need to rely on the file upload package)

<!-- google二维码工具 -->
<dependency>
 <groupId>com.google.zxing</groupId>
 <artifactId>javase</artifactId>
 <version>3.1.0</version>
</dependency>

<!-- 文件上传 -->
<dependency>
 <groupId>commons-fileupload</groupId>
 <artifactId>commons-fileupload</artifactId>
 <version>1.3.1</version>
</dependency>
<dependency>
 <groupId>commons-io</groupId>
 <artifactId>commons-io</artifactId>
 <version>2.4</version>
</dependency>

2. Create a QR code generation interface (the interface parameter is the QR code content, usually a URL)

/**
 * 生成二维码
 * google zxing 实现
 * @param text
 * @return
 */
@RequestMapping(value = "/qrcode/encode", method = RequestMethod.POST)
public void encodeQrCode(String text, HttpServletResponse response) {
  try {
   // 设置二维码参数
   Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
   hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
   BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, 150, 150, hints);
   //返回二维码
   MatrixToImageWriter.writeToStream(bitMatrix, "jpg", response.getOutputStream());
  } catch (Exception e) {
   e.printStackTrace();
  }
}

3. Create a QR code decoding interface (directly returns the decoded QR code content)

/**
 * 二维码图片解码
 * google zxing 实现
 * @param qrImg
 * @return
 */
@RequestMapping(value = "/qrcode/decode", method = RequestMethod.POST)
public String decodeQrCode(MultipartFile qrImg) {
  if (!qrImg.isEmpty()) {
   try {
     BufferedImage image = ImageIO.read(qrImg.getInputStream());

     BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));

     // 定义二维码的参数:
     HashMap<DecodeHintType, Object> hints = new HashMap<>();
     // 定义字符集
     hints.put(DecodeHintType.CHARACTER_SET, "utf-8");

     Result result = new MultiFormatReader().decode(binaryBitmap, hints);

     return result.getText();
   } catch (Exception e) {
     e.printStackTrace();
   }
  }

  return null;
}

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