java 生成小程序二维码并增加指定参数

您好！关于您的问题，可以使用第三方库zxing，结合微信开放平台提供的接口生成小程序码并传递参数。具体实现步骤如下：

1. 引入zxing库，这里以Maven为例：

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.4.0</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.4.0</version>
</dependency>

2. 调用微信接口获取小程序码：

public static BufferedImage getMiniProgramCode(String accessToken, String path, int width) {
    String url = "https://api.weixin.qq.com/wxa/getwxacode?access_token=" + accessToken;
    HttpPost httpPost = new HttpPost(url);
    httpPost.setEntity(new StringEntity("{\"path\":\"" + path + "\",\"width\":" + width + "}", ContentType.APPLICATION_JSON));
    CloseableHttpResponse response = null;
    try {
        response = HttpClients.createDefault().execute(httpPost);
        if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
            InputStream inputStream = response.getEntity().getContent();
            return ImageIO.read(inputStream);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (response != null) {
            try {
                response.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return null;
}

3. 将参数添加到小程序码中：

public static BufferedImage addParameterToMiniProgramCode(BufferedImage miniProgramCode, String parameter) {
    BufferedImage newImage = new BufferedImage(miniProgramCode.getWidth(), miniProgramCode.getHeight() + 20, BufferedImage.TYPE_INT_RGB);
    Graphics2D graphics = newImage.createGraphics();
    graphics.setColor(Color.WHITE);
    graphics.fillRect(0, 0, newImage.getWidth(), newImage.getHeight());
    graphics.drawImage(miniProgramCode, 0, 0, null);
    graphics.setColor(Color.BLACK);
    graphics.setFont(new Font("宋体", Font.PLAIN, 16));
    graphics.drawString("参数：" + parameter, 0, miniProgramCode.getHeight() + 16);
    graphics.dispose();
    return newImage;
}

4. 最后可以将处理后的小程序码保存到本地或直接返回给前端。

以上就是生成小程序码并添加参数的实现过程，希望可以帮到您。