code: public static String addDoubleQuotesIfNo(String text) {
  		if (text == null)
  			return "\"null\"";
  		
  		String trim = text.trim();
  		if (trim.startsWith("\"") && trim.endsWith("\""))
  			return text;
  		return addDoubleQuotes(text);
  	}
docs: 如果 <tt>text</tt>没有双引号括起来，就两边加上英文双引号<br>
  @see {@link #addDoubleQuotes(String)}
  @param text
  @since 1.0.3