StringUtil

/**
	 * 填充字符
	 * 
	 * @param source
	 *            源字符串
	 * @param fillChar
	 *            填充字符
	 * @param len
	 *            填充到的长度
	 * @return 填充后的字符串
	 */
	public static String fillLeft(String source, char fillChar, long len) {
		StringBuffer ret = new StringBuffer();
		if (null == source)
			ret.append("");
		if (source.length() > len) {
			ret.append(source);
		} else {
			long slen = source.length();
			while (ret.toString().length() + slen < len) {
				ret.append(fillChar);
			}
			ret.append(source);
		}
		return ret.toString();
	}


public static String addZeroForNum(String str, int strLength) {
	    int strLen = str.length();
	    if (strLen < strLength) {
	        while (strLen < strLength) {
	            StringBuffer sb = new StringBuffer();
	            sb.append("0").append(str);// 左补0
	            // sb.append(str).append("0");//右补0
	            str = sb.toString();
	            strLen = str.length();
	        }
	    }

	    return str;
	}