pisanie serwera ftp java

Question

Tringuję, aby napisać kod, który otwiera serwer ftp na moim standardzie, więc mógłbym skopiować plik z niego do klienta na innym komputerze i odwrotnie, ale jestem bardzo nowy w programowaniu po stronie serwera i nie rozumiem, jak ...

Mam Apache FtpServer, ale trochę się myliłem z jego użyciem, więc jeśli ktoś mógłby mi pomóc z podstawowymi krokami jak byłbym bardzo wdzięczny.
może coś takiego:

1. każ połączyć
2. logowania
3. zrobić kilka rzeczy ....

Answer 1

Zapiszę podstawowy przykład dla Ciebie, korzystając z bardzo przydatnych 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 it's 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 files 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 
    } 

Zauważ, że po stronie serwera nie musisz zajmować się ręcznie połączeniami, loginami, itp.: Ftplet robi to za ciebie.

Można jednak dodać niestandardowy pre [lub post] mięsu wewnątrz Zastępowana metod swojej anonimowej klasy wewnętrznej Ftplet (jeśli instancję z new Ftplet(){ ... }.