alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (FtpServer.java)

This example Java source code file (FtpServer.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, ftpauthhandler, ftpcommandhandler, ftpfilesystemhandler, ftpserver, ioexception, net, network, serversocket, thread, util

The FtpServer.java Java example source code

/*
 * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

import java.net.*;
import java.io.*;
import java.util.ArrayList;

/**
 * This class implements a simple FTP server that can handle multiple
 * connections concurrently. This is mostly meant as a test environment.
 * You have to provide 2 handlers for it to be effective, one to simulate
 * (or access) a filesystem and one to deal with authentication.
 * See {@link FtpFileSystemHandler} and {@link FtpAuthHandler}.
 *
 * Since it is a subclass of Thread, you have to call <code>start()
 * To get it running.
 *
 * Usage example:<p>
 *
 * <code>
 * FtpServer server = new FtpServer(0);
 * int port = server.getLocalPort();
 * server.setFileSystemHandler(myFSHandler);
 * server.setAuthHandler(myAuthHandler);
 * server.start();
 * </code>
 *
 */

public class FtpServer extends Thread {
    private ServerSocket listener = null;
    private FtpFileSystemHandler fsh = null;
    private FtpAuthHandler auth = null;
    private boolean done = false;
    private ArrayList<FtpCommandHandler> clients = new ArrayList();

    /**
     * Creates an instance of an FTP server which will listen for incoming
     * connections on the specified port. If the port is set to 0, it will
     * automatically select an available ephemeral port.
     */
    public FtpServer(int port) throws IOException {
        listener = new ServerSocket(port);
    }

    /**
     * Creates an instance of an FTP server that will listen on the default
     * FTP port, usually 21.
     */
    public FtpServer() throws IOException {
        this(21);
    }

    public void setFileSystemHandler(FtpFileSystemHandler f) {
        fsh = f;
    }

    public void setAuthHandler(FtpAuthHandler a) {
        auth = a;
    }

    public void terminate() {
        done = true;
        interrupt();
    }

    public void killClients() {
        synchronized (clients) {
            int c = clients.size();
            while (c > 0) {
                c--;
                FtpCommandHandler cl = clients.get(c);
                cl.terminate();
                cl.interrupt();
            }
        }
    }

    public int getLocalPort() {
        return listener.getLocalPort();
    }

    void addClient(Socket client) {
        FtpCommandHandler h = new FtpCommandHandler(client, this);
        h.setHandlers(fsh, auth);
        synchronized (clients) {
            clients.add(h);
        }
        h.start();
    }

    void removeClient(FtpCommandHandler cl) {
        synchronized (clients) {
            clients.remove(cl);
        }
    }

    public int activeClientsCount() {
        synchronized (clients) {
            return clients.size();
        }
    }

    public void run() {
        Socket client;

        try {
            while (!done) {
                client = listener.accept();
                addClient(client);
            }
            listener.close();
        } catch (IOException e) {

        }
    }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java FtpServer.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.