字符串每隔指定长度插入指定字符串

/**
	 * 字符串每隔指定长度插入指定字符串
	 *
	 * make by Administrator on 2014-5-22 下午11:44:11
	 * @param original         处理字符串
	 * @param insertString     插入字符串
	 * @param interval         间隔的字符长度
	 * @return
	 */
	public static String stringInsertByInterval(String original,
			String insertString, int interval) {
		if(original==null)return "";
		Integer len = original.length();
		if(interval>=len) return original;
		
		String rtnString = original;
		if (original.length() > interval) {
			List<String> strList = new ArrayList<String>();
			Pattern p = Pattern.compile("(.{" + interval + "}|.*)");
			Matcher m = p.matcher(original);
			while (m.find()) {
				strList.add(m.group());
			}
			strList =  strList.subList(0, strList.size()-1);
			rtnString = StringUtils.join(strList, insertString);
		}
		return rtnString;
	}


public static void main(String[] args)throws Exception {
		String s="sfds我是东小黑是的范德萨飞sdfsdfffffffffffffffffsadsa是的范德萨的说法";
		System.out.println(StringConvertUtil.stringInsertByInterval(s, "<br/>", 10));
		
		
	}