<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;
}

//獲取要賦值給二維碼的鏈接后綴如 192.168.0.21/erweima
String url = erweima;
 
//獲取本機ip地址，也可以找一指定ip地址寫死
InetAddress localhost = StrUtil.getLocalHostExactAddress();
 
//設置二維碼訪問路徑
String URL= "http://localhost"+ url;
 
//設置二維碼流
qrcode = YmtUtil.getQRCodeImage(URL, 360, 360);
final HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.IMAGE_PNG);
 
//設置生成的二維碼存儲地址 linux路徑：（/root/D:/opt/upFiles）  window路徑（D:/opt/upFiles）此處使用的是linux路徑
File path = new File("/root/D:/opt/upFiles", 二維碼名稱 + ".jpg");
 
//將二進制數(shù)組轉為文件
ByteArrayInputStream inputStream = new ByteArrayInputStream(qrcode);
MockMultipartFile file = new MockMultipartFile(ContentType.APPLICATION_OCTET_STREAM.toString(), inputStream);
file.transferTo(path);