让我使用非常有用的 Apache FtpServer 为您编写一个基本示例：

FtpServerFactory serverFactory = new FtpServerFactory();
ListenerFactory factory = new ListenerFactory();
factory.setPort(1234);// set the port of the listener (choose your desired port, not 1234)
serverFactory.addListener("default", factory.createListener());
PropertiesUserManagerFactory userManagerFactory = new PropertiesUserManagerFactory();
userManagerFactory.setFile(new File("/home/blablah/myusers.properties"));//choose any. We're telling the FTP-server where to read its user list
userManagerFactory.setPasswordEncryptor(new PasswordEncryptor()
{//We store clear-text passwords in this example

        @Override
        public String encrypt(String password) {
            return password;
        }

        @Override
        public boolean matches(String passwordToCheck, String storedPassword) {
            return passwordToCheck.equals(storedPassword);
        }
    });
    //Let's add a user, since our myusers.properties file is empty on our first test run
    BaseUser user = new BaseUser();
    user.setName("test");
    user.setPassword("test");
    user.setHomeDirectory("/home/blablah");
    List<Authority> authorities = new ArrayList<Authority>();
    authorities.add(new WritePermission());
    user.setAuthorities(authorities);
    UserManager um = userManagerFactory.createUserManager();
    try
    {
        um.save(user);//Save the user to the user list on the filesystem
    }
    catch (FtpException e1)
    {
        //Deal with exception as you need
    }
    serverFactory.setUserManager(um);
    Map<String, Ftplet> m = new HashMap<String, Ftplet>();
    m.put("miaFtplet", new Ftplet()
    {

        @Override
        public void init(FtpletContext ftpletContext) throws FtpException {
            //System.out.println("init");
            //System.out.println("Thread #" + Thread.currentThread().getId());
        }

        @Override
        public void destroy() {
            //System.out.println("destroy");
            //System.out.println("Thread #" + Thread.currentThread().getId());
        }

        @Override
        public FtpletResult beforeCommand(FtpSession session, FtpRequest request) throws FtpException, IOException
        {
            //System.out.println("beforeCommand " + session.getUserArgument() + " : " + session.toString() + " | " + request.getArgument() + " : " + request.getCommand() + " : " + request.getRequestLine());
            //System.out.println("Thread #" + Thread.currentThread().getId());

            //do something
            return FtpletResult.DEFAULT;//...or return accordingly
        }

        @Override
        public FtpletResult afterCommand(FtpSession session, FtpRequest request, FtpReply reply) throws FtpException, IOException
        {
            //System.out.println("afterCommand " + session.getUserArgument() + " : " + session.toString() + " | " + request.getArgument() + " : " + request.getCommand() + " : " + request.getRequestLine() + " | " + reply.getMessage() + " : " + reply.toString());
            //System.out.println("Thread #" + Thread.currentThread().getId());

            //do something
            return FtpletResult.DEFAULT;//...or return accordingly
        }

        @Override
        public FtpletResult onConnect(FtpSession session) throws FtpException, IOException
        {
            //System.out.println("onConnect " + session.getUserArgument() + " : " + session.toString());
            //System.out.println("Thread #" + Thread.currentThread().getId());

            //do something
            return FtpletResult.DEFAULT;//...or return accordingly
        }

        @Override
        public FtpletResult onDisconnect(FtpSession session) throws FtpException, IOException
        {
            //System.out.println("onDisconnect " + session.getUserArgument() + " : " + session.toString());
            //System.out.println("Thread #" + Thread.currentThread().getId());

            //do something
            return FtpletResult.DEFAULT;//...or return accordingly
        }
    });
    serverFactory.setFtplets(m);
    //Map<String, Ftplet> mappa = serverFactory.getFtplets();
    //System.out.println(mappa.size());
    //System.out.println("Thread #" + Thread.currentThread().getId());
    //System.out.println(mappa.toString());
    FtpServer server = serverFactory.createServer();
    try
    {
        server.start();//Your FTP server starts listening for incoming FTP-connections, using the configuration options previously set
    }
    catch (FtpException ex)
    {
        //Deal with exception as you need
    }

请注意，在服务器端，您不必手动处理连接，登录等：Ftplet会为您完成此操作。

不过，您可以在匿名内部Ftplet类的覆盖方法中添加自定义的预处理过程（使用实例化时）new Ftplet(){ ... }。