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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the Eclipse Public License.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [Eclipse Public License - v 1.0]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this EPL license.
 *
 * The generated images can then be used without any reference to the EPL license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.ftp;

// server

// FtpServer.java
import static java.nio.charset.StandardCharsets.UTF_8;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Map;
import java.util.Objects;
import java.util.TreeMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import net.sourceforge.plantuml.FileFormat;
import net.sourceforge.plantuml.log.Logme;

public class FtpServer {

	private final Map datas = new TreeMap();
	private final ExecutorService exeImage = Executors.newFixedThreadPool(2);

	private final int listenPort;

	private int portFree = 10042;
	private String ip;
	private final FileFormat defaultfileFormat;

	public FtpServer(int listenPort, FileFormat defaultfileFormat) {
		this.listenPort = listenPort;
		this.defaultfileFormat = defaultfileFormat == null ? FileFormat.PNG : defaultfileFormat;
	}

	public synchronized int getFreePort() {
		portFree++;
		// Log.println("port=" + portFree);
		return portFree;
	}

	public void go() throws IOException {
		final ServerSocket s = new ServerSocket(listenPort);
		final ExecutorService exe = Executors.newCachedThreadPool();
		while (true) {
			final Socket incoming = s.accept();
			ip = incoming.getLocalAddress().getHostAddress();
			System.out.println("New Client Connected from " + incoming.getInetAddress().getHostName() + "... ");
			exe.submit(new FtpLoop(incoming, this));
		}
	}

	public String getIpServer() {
		return ip;
	}

	public synchronized FtpConnexion getFtpConnexion(String user) {
		FtpConnexion data = datas.get(Objects.requireNonNull(user));
		if (data == null) {
			data = new FtpConnexion(user, defaultfileFormat);
			datas.put(user, data);
		}
		return data;
	}

	public static void main(String[] args) throws IOException {
		System.out.println("****************************** ************************************************** ");
		System.out.println("****************************** FTP SERVER***********************************");

		System.out.println("****************************** ************************************************** ");
		System.out.println("Server Started...");
		System.out.println("Waiting for connections...");
		System.out.println(" ");
		new FtpServer(4242, FileFormat.PNG).go();
	}

	public void processImage(final FtpConnexion connexion, final String name) {
		exeImage.submit(new Runnable() {
			public void run() {
				try {
					connexion.processImage(name);
				} catch (IOException e) {
					Logme.error(e);
				}
			}
		});
	}

	public final String getCharset() {
		return UTF_8.name();
	}

}