Apache Mina Java FTP服务器实现-客户端卡在等待欢迎消息

Question

I am implementing an FTP server in Java for a project. I can start the server but when I try to connect with a client it is stuck on "waiting for welcome message". I've looked at several examples but I'm not sure where I'm going wrong. Here is the class I have. I will eventually break some of this out into other methods.

The user parameters have been cleared for the purposes of this post.

public class FTPServer {


final int PORT = 2221;
String userfile = "";
String username="";
String password = ""
String homedir ="";

private FtpServer server=null;
public FTPServer() {}

public FTPServer(final String ipaddress, final int port){   


FtpServerFactory serverFactory = new FtpServerFactory();
ListenerFactory listenerfactory = new ListenerFactory();

    listenerfactory.setDataConnectionConfiguration(
    new DataConnectionConfigurationFactory().createDataConnectionConfiguration());

    ConnectionConfigFactory connection = new ConnectionConfigFactory();
    connection.setMaxLoginFailures(10);
    connection.setLoginFailureDelay(5);
    connection.setAnonymousLoginEnabled(false);

// set the ip address of the listener
listenerfactory.setServerAddress(ipaddress);

// set the port of the listener
if (port == 0)
{ listenerfactory.setPort(PORT);}

else {listenerfactory.setPort(port);
// replace the default listener
serverFactory.addListener("default", listenerfactory.createListener());
     serverFactory.setConnectionConfig(connection.createConnectionConfig());

}

PropertiesUserManagerFactory userManagerFactory = new PropertiesUserManagerFactory();
userManagerFactory.setFile(new File(userfile));
userManagerFactory.setPasswordEncryptor(new SaltedPasswordEncryptor());
UserManager um = userManagerFactory.createUserManager();
BaseUser user = new BaseUser();

user.setName(username);
user.setPassword(password);
user.setHomeDirectory(homedir);
try {
    um.save(user);
} catch (FtpException e1) {
    // TODO Auto-generated catch block
    this.StopServer();
    e1.printStackTrace();
}

serverFactory.setUserManager(um);
    server = serverFactory.createServer();

}

public void  StopServer(){ this.server.stop(); }

public void StartServer()
{
try {
    server.start();
} catch (FtpException e) {
    // handle this eventually, good enough for testing now
    e.printStackTrace();
}
}

Here is the code that creates the server and starts and stops it

final int port = 0;
final String ipaddress = "";
FTPServer server = new FTPServer(ipaddress,port);
server.StartServer();
 server.StopServer();

Answer 1

I'd say that FtpServer.Start only starts listening on the incoming port. It does not block. You kill the server immediately afterwards by calling .Stop .

You have to wait in your code explicitly to keep the server running.

server.StartServer();
Thread.sleep(Long.MAX_VALUE);