Zxing二维码生成

一、导入依赖：

    <!--zxing二维码生成工具-->
    <dependency>
      <groupId>com.google.zxing</groupId>
      <artifactId>core</artifactId>
      <version>3.3.3</version>
    </dependency>
    <dependency>
      <groupId>com.google.zxing</groupId>
      <artifactId>javase</artifactId>
      <version>3.3.3</version>
    </dependency>

二、代码实现：

    @RequestMapping("/tset")
    public void test(HttpServletResponse response) throws URISyntaxException, IOException {
        //二维码需要包含的文本内容
        String uri = "http://www.baidu.com";
        HashMap<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        hints.put(EncodeHintType.MARGIN, 2);
        try {
            BitMatrix bitMatrix = new MultiFormatWriter()
                    .encode(uri, BarcodeFormat.QR_CODE, 200, 200, hints);
            MatrixToImageWriter.writeToStream(bitMatrix, "PNG", response.getOutputStream());
            System.out.println("创建二维码完成");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }