编写 Java FTP 服务器
我正在尝试编写一个代码，在我的独立设备上打开一个 FTP 服务器，这样我就可以将文件从它复制到另一台计算机上的客户端，反之亦然，但我对服务器端编程非常陌生，不会了解如何.
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 但对它的使用有点困惑，我正在寻找有关如何使用它的基本步骤.可能是这样的:
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:
- 执行连接命令
- 登录
- 做一些事情......
推荐答案
让我为你写一个基本的例子，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
}
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.
Note that, server-side, you don't have to deal manually with connects, logins, etc: the Ftplet does that for you.
但是，您可以在匿名内部 Ftplet 类的重写方法中添加自定义的预处理[或后]处理(当您使用 new Ftplet(){ ... } 实例化它时.
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(){ ... }.
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