一键登录，使用自己的认证方案，token解密有问题

public static HashMap<String, String> decryptToken(Context context, String token) {
        HashMap<String, String> tokenMap = null;
        try {
            DirectConnectToken dcToken = JSON.parseObject(Base64.decode(token, Base64.DEFAULT), DirectConnectToken.class);
            if(dcToken.getKey() == null){
                System.out.println("==decryptToken dcToken null...");
            }
            String aeskey = decryptByPrivateKey(Base64.decode(dcToken.getKey(), Base64.DEFAULT),
                    RSA_PRIVATE_KEY);
            String encryptToken = AESUtil.decryptBase642String(dcToken.getEncryptToken(), aeskey, context.getPackageName());
            tokenMap = JSON.parseObject(encryptToken, HashMap.class);
            tokenMap.put("vendorName", dcToken.getVendorName());
        } catch (Exception e) {
            System.out.println("==decryptToken catch...");
            e.printStackTrace();
        }
        return tokenMap;
    }

DirectConnectToken dcToken = JSON.parseObject(Base64.decode(token, Base64.DEFAULT), DirectConnectToken.class); 这边出错了，解出来dcToken.getKey()是null的，是什么原因？