code: public static JarFile getJarFile(URL url) {
  		try {
  			JarURLConnection urlConnection = (JarURLConnection) url.openConnection();
  			return urlConnection.getJarFile();
  		} catch (IOException e) {
  			throw new IORuntimeException(e);
  		}
  	}
docs: 从URL中获取JarFile
  
  @param url URL
  @return JarFile
  @since 4.1.5