利用谷歌的zxing包来实现二维码的生成。

1、添加maven依赖

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

2、Java代码块

public void getCode1(String phone)throws WriterException, IOException {//生成的二维码的路径//  String QR_CODE_IMAGE_PATH = "D:\\IdeaProjects\\ruiyi-ms\\target\\classes\\META-INF\\resources\\code.png";String QR_CODE_IMAGE_PATH = "D:\\ruoyi\\uploadPath\\avatar\\code.png";//二维码中的内容String QR_CODE_TEXT = phone;//二维码图片的宽度int WIDTH = 300;//二维码图片的高度int HEIGHT = 300;QRCodeWriter qrCodeWriter = new QRCodeWriter();Hashtable hints = new Hashtable();hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//H最高容错等级hints.put(EncodeHintType.CHARACTER_SET, "utf-8");BitMatrix bitMatrix = qrCodeWriter.encode(QR_CODE_TEXT, BarcodeFormat.QR_CODE, WIDTH, HEIGHT, hints);Path path = FileSystems.getDefault().getPath(QR_CODE_IMAGE_PATH);MatrixToImageWriter.writeToPath(bitMatrix, "PNG", path);}

这种方式是生成二维码 还有生成流返回给前台  

https://blog.csdn.net/weixin_47316183/article/details/125275108https://blog.csdn.net/qq_21234103/article/details/120620468?utm_term=java%E7%94%9F%E6%88%90%E4%BA%8C%E7%BB%B4%E7%A0%81%E6%A0%87%E7%AD%BE&utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~sobaiduweb~default-0-120620468-null-null&spm=3001.4430