자바 QR 코드 생 성 및 url 링크 부여 기능 구현

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>
 
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.0</version>
</dependency>

public class YmtUtil {
   public static byte[] getQRCodeImage(String text, int width, int height) throws 
        WriterException, IOException {
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, 
        height);
        ByteArrayOutputStream pngOutputStream = new ByteArrayOutputStream();
        MatrixToImageWriter.writeToStream(bitMatrix, "PNG", pngOutputStream);
        byte[] pngData = pngOutputStream.toByteArray();
        return pngData;
}

//                192.168.0.21/erweima
String url = erweima;
 
//    ip  ，       ip    
InetAddress localhost = StrUtil.getLocalHostExactAddress();
 
//         
String URL= "http://localhost"+ url;
 
//      
qrcode = YmtUtil.getQRCodeImage(URL, 360, 360);
final HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.IMAGE_PNG);
 
//             linux  ：（/root/D:/opt/upFiles）  window  （D:/opt/upFiles）      linux  
File path = new File("/root/D:/opt/upFiles",       + ".jpg");
 
//          
ByteArrayInputStream inputStream = new ByteArrayInputStream(qrcode);
MockMultipartFile file = new MockMultipartFile(ContentType.APPLICATION_OCTET_STREAM.toString(), inputStream);
file.transferTo(path);