AES 对称加密 （JDK）

        /**
         * AES 加密 解密
         */

        //key生成
        KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
        //长度有 64 112 128 192 256
        keyGenerator.init(256);
        SecretKey secretKey = keyGenerator.generateKey();
        byte[] encoded = secretKey.getEncoded();

        //key转换
        SecretKeySpec keySpec = new SecretKeySpec(encoded, "AES");

        //加密
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);
        byte[] bytes = cipher.doFinal("加密字符串".getBytes());
        System.out.println(Base64.encodeBase64String(bytes));

        //解密
        cipher.init(Cipher.DECRYPT_MODE, keySpec);
        bytes = cipher.doFinal(bytes);
        System.out.println(new String(bytes));