online-chat-ueb3/src/com/vertsys/Server.java

package com.vertsys;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;


public class Server {
    protected static ServerSocket sock;

    protected static ArrayList<String> messages = new ArrayList<>();
    protected static ArrayList<Socket> clients = new ArrayList<>();

    protected static int port;

    protected static boolean DEBUG_MODE = true;

    public static void main(String[] args){
        init(args);
        try {
            sock = new ServerSocket(port);
        } catch (IOException e) {
            e.printStackTrace();
        }
        while (true){
            if (DEBUG_MODE)
                System.out.println("Socket opened... Waiting for connections");
            try {
                Socket connSocket = sock.accept();
                clients.add(connSocket);
                new Thread(new ServerThread(connSocket)).start();
            } catch (IOException e){

            }
        }

    }


    public static void init(String[] args){

        switch (args.length) {
            case 0:
                if (DEBUG_MODE)
                    System.out.println("No Parameters. Set port to default values...");
                port = 42424;
                break;
            case 1:
                if (DEBUG_MODE)
                    System.out.println("Port as Parameter.");
                port = Integer.parseInt(args[1]);
                if (port < 0) {
                    System.err.println("ERROR: Port must be a value >= 0!");
                    System.out.println("Usage: java ConcatServer [port]");
                    System.exit(-1);
                }
                break;

            default:
                System.out.println("Usage: java ConcatServer [port]");
                System.exit(0);
                break;
        }
    }
}