工具类-获取一定长度的随机字符串

/**
 * 获取一定长度的随机字符串
 * @param length 指定字符串长度
 * @return 一定长度的字符串
 */
public static String getRandomStringByLength(int length) {
	String base = "abcdefghijklmnopqrstuvwxyz0123456789";
	Random random = new Random();
	StringBuffer sb = new StringBuffer();
	for (int i = 0; i < length; i++) {
		int number = random.nextInt(base.length());
		sb.append(base.charAt(number));
	}
	return sb.toString();
}