JAVA Aes加密解密

Aes 加密两种方式为什么加出来的不一样？求大神讲解

第一种

   /**
     * 加密
     * @param content
     * @param keyBytes
     * @param iv
     * @return
     * @throws Exception
     */
    public String AES_CBC_Encrypt(byte[] content, byte[] keyBytes, byte[] iv) throws Exception{
        try{
            KeyGenerator keyGenerator= KeyGenerator.getInstance("AES");
            keyGenerator.init(128, new SecureRandom(keyBytes) );
            SecretKey key=keyGenerator.generateKey();
            Cipher cipher=Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));
            byte[] result=cipher.doFinal(content);
            return Base64.encodeBase64String(result);
        }catch (Exception e) {
            e.printStackTrace();
            throw e;
        }
    }

    /**
     * 解密
     * @param content
     * @param keyBytes
     * @param iv
     * @return
     * @throws Exception
     */
    public String AES_CBC_Decrypt(byte[] content, byte[] keyBytes, byte[] iv) throws Exception{
        try{

            KeyGenerator keyGenerator=KeyGenerator.getInstance("AES");
            keyGenerator.init(128, new SecureRandom(keyBytes));//key长可设为128，192，256位，这里只能设为128
            SecretKey key=keyGenerator.generateKey();
            Cipher cipher=Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));

            byte[] result=cipher.doFinal(content);
            return Base64.encodeBase64String(result);
        }catch (Exception e) {
            e.printStackTrace();
            throw e;
        }
    }

第二种

/**
     * 提供密钥和向量进行加密
     *
     * @param sSrc
     * @param key
     * @param iv
     * @return
     * @throws Exception
     */
    public static String Encrypt(String sSrc, byte[] key, byte[] iv) throws Exception {
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");// "算法/模式/补码方式"
        IvParameterSpec _iv = new IvParameterSpec(iv);// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, _iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return Base64.encodeBase64String(encrypted);
    }
    /**
     * 提供密钥和向量进行解密
     *
     * @param sSrc
     * @param key
     * @param iv
     * @return
     * @throws Exception
     */
    public static String Decrypt(String sSrc, byte[] key, byte[] iv) throws Exception {
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        IvParameterSpec _iv = new IvParameterSpec(iv);
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, _iv);
        byte[] encrypted = Base64.decodeBase64(sSrc);
        byte[] original = cipher.doFinal(encrypted);
        return new String(original, "utf-8");
    }