java 实现AES加解密后，与在线工具测试结果不一致

/**
     * 参数加密私钥
     */
    static final String paramPrivateKey="3dae12897b044f96";

/**
     * 加密
     * @param sSrc
     * @return
     * @throws Exception
     */
    public static String paramEncrypt(String sSrc) throws Exception {
        if (paramPrivateKey == null) {
            System.out.print("Key为空null");
            return null;
        }
        // 判断Key是否为16位
        if (paramPrivateKey.length() != 16) {
            System.out.print("Key长度不是16位");
            return null;
        }
        byte[] raw = paramPrivateKey.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。
    }

 /**
     * 解密
     * @param sSrc
     * @return
     * @throws Exception
     */
    public static String paramDecrypt(String sSrc){
        try {
            if(!StringUtils.hasLength(sSrc)){
                return "";
            }
            // 判断Key是否正确
            if (paramPrivateKey == null) {
                System.out.print("Key为空null");
                return null;
            }
            // 判断Key是否为16位
            if (paramPrivateKey.length() != 16) {
                System.out.print("Key长度不是16位");
                return null;
            }
            byte[] raw = paramPrivateKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密
            try {
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original,"utf-8");
                return originalString;
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
    }