問題描述

我正在嘗試編寫一個代碼，在我的獨立設備上打開一個 FTP 服務器，這樣我就可以將文件從它復制到另一臺計算機上的客戶端，反之亦然，但我對服務器端編程非常陌生，不會了解如何.

I am trying to write a code that opens an FTP server on my stand-alone so I could copy file from it to a client in another computer and the opposite, but I am very new to server side programming and don't understand how.

我得到了 Apache FtpServer 但對它的使用有點困惑，我正在尋找有關如何使用它的基本步驟.可能是這樣的:

I got the Apache FtpServer but got a little confused with it's use, and am looking for the basic steps of how to use it. Maybe something like:

1. 執行連接命令
2. 登錄
3. 做一些事情......

推薦答案

讓我為你寫一個基本的例子，使用非常有用的Apache FtpServer:

Let me write a basic example for you, using the very useful Apache FtpServer:

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
    }

請注意，在服務器端，您不必手動處理連接、登錄等:Ftplet 會為您完成.

Note that, server-side, you don't have to deal manually with connects, logins, etc: the Ftplet does that for you.

但是，您可以在匿名內部 Ftplet 類的重寫方法中添加自定義的預處理[或后]處理(當您使用 new Ftplet(){ ... } 實例化它時.

You can, however, add your custom pre[or post]-processing inside the overridden methods of your anonymous inner Ftplet class (when you instantiate it with new Ftplet(){ ... }.

這篇關于編寫 Java FTP 服務器的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！