Java之利用QrCode生成二维码

短命女 2022-10-16 15:24 190阅读 0赞

1、pom依赖：

<dependency>
                <groupId>com.google.zxing</groupId>
                <artifactId>core</artifactId>
                <version>3.4.0</version>
            </dependency>
            <dependency>
                <groupId>com.google.zxing</groupId>
                <artifactId>javase</artifactId>
                <version>3.4.0</version>
            </dependency>

2、QrCodeUtil 工具类：

import com.google.zxing.BarcodeFormat;
    import com.google.zxing.WriterException;
    import com.google.zxing.client.j2se.MatrixToImageWriter;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.qrcode.QRCodeWriter;
    
    /**
     * 二维码
     * 文件流
     *
     */
    public class QrCodeUtil {
        public static byte[] getQRCodeImage(String text, int width, int height) {
            QRCodeWriter qrCodeWriter = new QRCodeWriter();
            byte[] pngData = new byte[0];
            try {
                BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height);
                ByteArrayOutputStream pngOutputStream = new ByteArrayOutputStream();
                try {
                    MatrixToImageWriter.writeToStream(bitMatrix, "PNG", pngOutputStream);
                    pngData = pngOutputStream.toByteArray();
                } catch (IOException e) {
                    e.printStackTrace();
                    System.out.println("Could not generate QR Code, WriterException :: " + e.getMessage());
                }
            } catch (WriterException e) {
                e.printStackTrace();
                System.out.println("Could not generate QR Code, WriterException :: " + e.getMessage());
            }
            return pngData;
        }
    }

3、生成二维码

public ResponseEntity<byte[]> getQRImage(HttpServletRequest request) {
            //二维码内置信息
            String content = "扫码信息";
            byte[] qrcode = QrCodeUtil.getQRCodeImage(content, 360, 360);
            // Set headers
            final HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.IMAGE_PNG);
            return new ResponseEntity<byte[]>(qrcode, headers, HttpStatus.CREATED);
        }