code: public BufferedImage getImage(String urlStr) throws FlickrException {
          InputStream in = null;
          try {
              URL url = new URL(urlStr);
              HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
              if (transport instanceof REST) {
                  if (((REST) transport).isProxyAuth()) {
                      conn.setRequestProperty("Proxy-Authorization", "Basic " + ((REST) transport).getProxyCredentials());
                  }
              }
              conn.connect();
              in = conn.getInputStream();
              return ImageIO.read(in);
          } catch (IOException e) {
              throw new FlickrException(e.getMessage(), e.getCause());
          } finally {
              IOUtilities.close(in);
          }
      }
docs: Download of an image by URL.
  
  @param urlStr
  The URL of a Photo
  @return BufferedImage The The Image