How to get html based on specified clipboard?

    /**
     * 从指定的剪切板中获取html
     * @param clipboard
     * @return
     * @throws Exception
     */
    public static String getClipboardHtml(Clipboard clipboard) throws Exception {
        if(clipboard == null){
            clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();//获取系统剪贴板
        }
        // 获取剪切板中的内容
        Transferable clipT = clipboard.getContents(null);
        if (clipT != null) {
            DataFlavor dataFlavor = new DataFlavor("text/html;class=java.lang.String");
            return String.valueOf(clipT.getTransferData(dataFlavor));
        }
        return null;
    }