获取ftp服务器时间

public static synchronized void  getFtpTime(){
        new Thread(() -> {
            FTPClient ftpClient = new FTPClient();
            try {
                ftpClient.connect(ip,port);
                ftpClient.login(user,password);
                ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
                ftpClient.enterLocalPassiveMode();
                //创建或追加文件time.txt
                OutputStream outputStream = ftpClient.appendFileStream("time.txt");
                outputStream.write("1".getBytes());
                outputStream.flush();
                outputStream.close();
                ftpClient.completePendingCommand();//OutputStream完成
                for(FTPFile file : ftpClient.listFiles()){
                    if(file.getName().equals("time.txt")) {
                    	//获取文件修改时间
                        long time = file.getTimestamp().getTimeInMillis();
                        Log.d("", "getFtpTime: "+time);
                    }
                }
                ftpClient.deleteFile("time.txt");
                ftpClient.logout();
            } catch (IOException e) {
                Log.d("'", "getFtpTime: error "+e.toString());
            }
        }).start();
    }