FileChannel处理下载文件

public static void main(String[] args) {
      String originFileUrl = "";
      String savePath = "";
      String fileName = "";
      InputStream is = null;
      FileOutputStream fos = null;
      try {
          URL url = new URL(originFileUrl);
          HttpURLConnection conn = (HttpURLConnection) url.openConnection();
          conn.setRequestProperty(USER_AGENT, USER_AGENT_VALUE);
          is = conn.getInputStream();

          //文件保存位置
          File saveDir = new File(savePath);
          if (!saveDir.exists()) {
              boolean mkdir = saveDir.mkdir();
              logger.info("mkdir : {}, result: {}", savePath, mkdir);
          }
          File file = new File(saveDir + File.separator + fileName);
          fos = new FileOutputStream(file);

          fos.getChannel().transferFrom(Channels.newChannel(is), 0, Integer.MAX_VALUE);
            
          fos.flush();
      } catch (Exception e) {
          e.printStackTrace();
      } finally {
          IOUtils.closeQuietly(fos);
          IOUtils.closeQuietly(is);
      }
  }