Simple Java Socket Shell using MyTrioX Framework.

Shell.java

/*
 * Copyright (C) Byte-Store.DE, Inc - All Rights Reserved
 *
 *  Unauthorized copying of this storage, via any medium is strictly prohibited.
 */

import de.bytestore.mytriox.cache.CacheHandler;
import de.bytestore.mytriox.network.server.ServerSocket;
import de.bytestore.mytriox.network.utils.Socket;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.HashMap;

import static de.bytestore.mytriox.cache.CacheHandler.charsetIO;

/**
 * Basic Socket Shell Example.
 * @author Jan Heil
 * @see Socket Shell using MyTrioX Framework.
 */
public class Shell extends ServerSocket {
    // Store Strings from Sockets as Buffer.
    private HashMap<java.net.Socket, StringBuilder> bufferIO = new HashMap<>();

    public static void main(String[] args) {
        // Print Debug Message.
        System.out.println("For testing use 'ncat -z -v 127.0.0.1 465' or 'telnet 127.0.0.1 465', you need to install Netcat.");

        new Shell(new InetSocketAddress("127.0.0.1", 465));
    }

    /**
     * Create ServerSocket with InetSocketAddress.
     *
     * @param networkIO
     */
    public Shell(InetSocketAddress networkIO) {
        // Init InetSocketAddress for Hostname.
        super(networkIO);

        // Enable MyTrioX Debugging.
        CacheHandler.debugIO = true;

        // Enable Binary Support for Socket.
        this.setBinary(true);

        // Enable Blocking Socket (Multithreading)
        this.setBlocking(true);

        // Start Server Socket.
        this.start();
    }

    @Override
    public void connect(Socket clientIO) {
        try {
            // Write Welcome Message.
            clientIO.write("Welcome to this Shell Example, you can quit by using CTRL+C and use help to get some example Response.\n\r# ".getBytes());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void binary(Socket clientIO, byte[] binaryIO) {
        // Print Debug Content of Socket.
        System.out.println(new String(binaryIO));

        try {
            // Convert current Binary Stream to String.
            String dataIO = new String(binaryIO, charsetIO);

            if (this.listen(clientIO, dataIO)) {
                // Put Socket into Buffer.
                if (!bufferIO.containsKey(clientIO.getSocket()))
                    bufferIO.put(clientIO.getSocket(), new StringBuilder());

                // Breakdown Line and write Buffer to Shell.
                if (dataIO.contains("\n")) {
                    // Build Line from Buffered Chars.
                    String lineIO = bufferIO.get(clientIO.getSocket()).toString().replaceAll(System.lineSeparator(), "");

                    // Write back to Shell.
                    clientIO.write(("\n\r> '" + lineIO + "'").getBytes(charsetIO));

                    // Listen for Commands.
                    if(this.listen(clientIO, lineIO))
                        clientIO.write(" - Can't find anything for your input, use help.");

                    // Write Line Initiator.
                    clientIO.write("\n\r# ");

                    // Clear Line Buffer.
                    bufferIO.remove(clientIO.getSocket());
                } else
                    // Append Line Data to Buffer.
                    bufferIO.get(clientIO.getSocket()).append(dataIO);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * Listen for Console Keys.
     *
     * @param socketIO
     * @param dataIO
     * @return
     */
    private boolean listen(Socket socketIO, String dataIO) throws IOException {
        switch (dataIO.toLowerCase()) {
            case "\u0003":
                socketIO.write("Goodbye :)");
                socketIO.close();
                return false;
            case "help":
                socketIO.write("\n\rVersion 1.0.10\n\rSample Shell Socket Application\n\rby Jan Heil\n\r");
                return false;
        }

        return true;
    }

}