无法将Firebase令牌存储在MySQL数据库中。

我无法确定自己在哪里出错了。我需要获取Firebase令牌并将其存储在数据库中，并使用这些令牌向这些设备发送通知。以下是我的代码。我真的需要一些帮助。

MainActivity.java

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        FirebaseInstanceId.getInstance().getToken();
        FirebaseMessaging.getInstance();
    }
}

FirebaseInstanceIDService.java

public class FirebaseInstanceIDService extends FirebaseInstanceIdService {
    @Override
    public void onTokenRefresh() {
        String token = FirebaseInstanceId.getInstance().getToken();
        Log.e("Token :",token);
        registerToken(token);
    }
    
    private void registerToken(String token) {
        OkHttpClient client = new OkHttpClient();
        RequestBody body = new FormBody.Builder()
                .add("Token",token)
                .build();
        Request request = new Request.Builder()
                .url("http://localhost/notify.php")
                .post(body)
                .build();
        try {
            client.newCall(request).execute();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

FirebaseMessagingService.java

public class FirebaseMessagingService extends com.google.firebase.messaging.FirebaseMessagingService{
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        showNotification(remoteMessage.getData().get("message"));
    }
    
    private void showNotification(String message) {
        Intent i = new Intent(this,MainActivity.class);
        i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this,0,i,PendingIntent.FLAG_UPDATE_CURRENT);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
                .setAutoCancel(true)
                .setContentTitle("FCM Test")
                .setContentText(message)
                .setSmallIcon(R.drawable.gas45)
                .setContentIntent(pendingIntent);
        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        manager.notify(0,builder.build());
    }
}

notify.php