生成指定長(zhǎng)度的隨機(jī)字符串

    /**
     * 隨機(jī)產(chǎn)生一個(gè)length長(zhǎng)度的a-Z和0-9混合字符串
     *
     * @param length 長(zhǎng)度
     * @return 隨機(jī)字符串
     */
    public static String generateRandomStr(int length) {
        String base = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        Random random = new Random();
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(base.length());
            sb.append(base.charAt(number));
        }
        return sb.toString();
    }