java生成二维码

• 导入依赖

  • <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>
    

• 编写生成二维码工具类：

  •  public static void getQR(String text, int width, int height, String filePath) throws WriterException, IOException {
            Hashtable hints = new Hashtable();
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            hints.put(EncodeHintType.MARGIN, 1);
    
    	//hints对象可以解决二维码内容中文乱码问题
    
            QRCodeWriter qrCodeWriter = new QRCodeWriter();
    
            BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height,hints);
    
            Path path = FileSystems.getDefault().getPath(filePath);
            System.out.println("path======="+path);
            MatrixToImageWriter.writeToPath(bitMatrix, "PNG", path);
    
        }
    

• controller调用：

  • String a="强哥强哥我爱你";
            String fileName= UUID.randomUUID()+".png";
            service.insert2(fileName);
            //将二维码订单图片名称插入数据库中，便于前端回显二维码
            String totalName="D:\\QRCode\\"+fileName;
            qrCode.getQR(a,100,100,totalName);
            //调用工具类，依次传入二维码内容、宽、高、以及要保存在哪个路径
            return "redirect:/toQR2";