Java 获取到第三方的二维码链接如何下载二维码图片

根据提供的引用内容，无法确定具体的二维码链接获取方式。但是，一旦获取到了第三方的二维码链接，可以使用Java中的网络编程相关类库，例如HttpURLConnection或者HttpClient，来下载二维码图片。以下是一个使用HttpURLConnection下载图片的示例代码：

import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class DownloadQRCode {
    public static void main(String[] args) {
        String qrCodeUrl = "https://example.com/qrcode.png"; // 二维码图片链接
        String savePath = "qrcode.png"; // 保存路径和文件名

        try {
            URL url = new URL(qrCodeUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5 * 1000);

            InputStream inputStream = conn.getInputStream();            byte[] getData = readInputStream(inputStream);

            FileOutputStream fos = new FileOutputStream(savePath);
            fos.write(getData);

            if (fos != null) {
                fos.close();
            }
            if (inputStream != null) {
                inputStream.close();
            }

            System.out.println("二维码图片下载成功！");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static byte[] readInputStream(InputStream inputStream) throws Exception {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while ((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        return bos.toByteArray();
    }
}