code: public static Object get(Transferable content, DataFlavor flavor) {
  		if (null != content && content.isDataFlavorSupported(flavor)) {
  			try {
  				return content.getTransferData(flavor);
  			} catch (UnsupportedFlavorException | IOException e) {
  				throw new UtilException(e);
  			}
  		}
  		return null;
  	}
docs: 获取剪贴板内容
  
  @param content {@link Transferable}
  @param flavor 数据元信息，标识数据类型
  @return 剪贴板内容，类型根据flavor不同而不同