Java生成随机字符串的代码

    public static String getRandomString(int length) { //length表示生成字符串的长度            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();            }