Spring boot 生成二维码

首先引入依赖

		<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>

使用方法：

	 public String getQrcodeBytext(@RequestParam("text") String text,@RequestParam("width") int width,@RequestParam("height") int height) throws IOException, WriterException {
		 QRCodeWriter qrCodeWriter = new QRCodeWriter();
		 Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
		 hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
		 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
		 hints.put(EncodeHintType.MARGIN, 0);//去除多余白边, 数字越小,白边越小.为0时 没有白边
		 BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);
		 ByteArrayOutputStream pngOutputStream = new ByteArrayOutputStream();
		 MatrixToImageWriter.writeToStream(bitMatrix, "PNG", pngOutputStream);
		 byte[] pngData = pngOutputStream.toByteArray();

		 //base64编码
		 Base64Encoder encoder = new Base64Encoder();
		 String png_base64 = encoder.encode(pngData).trim();//转换成base64串
		 png_base64 = png_base64.replaceAll("\n", "").replaceAll("\r", "");//删除 \r\n
		 return "data:image/png;base64,"+png_base64;
	 }