获取随机码

/***
	 * 获取指定长度的随机验证码
	 * @param cl 指定长度
	 * @return
	 */
	public static String getRandomCode(long cl) {
		long l = codeLength;
		if (cl > 0) {
			l = cl;
		}
		// 生成6位加密串
		Random random = new Random();
		String encodestr = "";
		for (int i = 0; i < l; i++) {
//			encodestr = encodestr + String.valueOf(randString.charAt(random.nextInt(randString.length())));
			encodestr = encodestr + String.valueOf(randStrings.charAt(random.nextInt(randStrings.length())));
		}
		return encodestr;
	}