获取指定长度的英文数字字符串

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    public static String getRandomString(int length) {
        StringBuilder stringBuilder = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < length; i++) {
            if (random.nextBoolean()) {
                stringBuilder.append((char) (random.nextInt(26) + (random.nextBoolean() ? 97 : 65)));
            } else {
                stringBuilder.append(random.nextInt(10));
            }
        }
        return stringBuilder.toString();
    }