Java FTP客户端无法上传，我缺少什么？

是的，所以我正在使用这段代码，但每当我运行它时，它不会上传任何东西。我有一个类似的代码在另一个程序的作品完美。我错过了什么

    public void upload(){
        new Thread(new Runnable() {
            public void run() {
                if (Looper.myLooper() == null)
                {
                    Looper.prepare();
                }
                FTPClient ftpClient = new FTPClient();
                FileInputStream inputStream = null;
                int Upload = sharedPreferences.getInt("Upload", 1);
                if (Upload == 1) {

                    try {
                        ftpClient.connect(InetAddress.getByName("XXX.net"));
                        ftpClient.login("XXX", "XXX");
                        ftpClient.changeWorkingDirectory("/public_html/Images/Cross");
                        ftpClient.setFileType(FTP.BINARY_FILE_TYPE, FTP.BINARY_FILE_TYPE);
                        File file = new File(getApplicationInfo().dataDir + "/files/" + "temp" + ".jpg");
                        inputStream = new FileInputStream(file);
                        ftpClient.storeFile("temporary.jpg", inputStream);
                        file.delete();
                        ftpClient.logout();
                        ftpClient.disconnect();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    } catch (SocketException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

...
}

---

上传文件后你不是要删除它吗？你没有得到任何异常？是的，这就是重点，我只想在ftp服务器@AleksandarStefanovićnone上删除它