Java生成隨機字符串，可以指定長度或者長度范圍

Java生成隨機字符串，可以指定長度或者長度范圍

    public static String getRandomString(int minLength, int maxLength) {
        Random random = new Random();
        int number = random.nextInt(maxLength - minLength) + minLength;
        return getRandomString(number);
    }

    public static String getRandomString(int length) {
        //定義一個字符串（A-Z，a-z，0-9）；
        String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
        //由Random生成隨機數
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < length; ++i) {
            int number = random.nextInt(str.length());
            sb.append(str.charAt(number));
        }
        return sb.toString();
    }