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

package com.vertsys;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Random;

import static com.vertsys.Server.DEBUG_MODE;

public class Client {

    protected static Socket sock;
    private static String username;
    private static BufferedReader ConsoleIn;
    private static final boolean DEBUG_MODE = true;

    public static void main(String[] args) {
	    init();
        do {
            try {
                String msg = ConsoleIn.readLine();
                sendMessage(msg);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }while (true);
    }

    public static void init(){
        String hostname = null;
        try {
            hostname = InetAddress.getLocalHost().getHostAddress();
            if(DEBUG_MODE)
                System.out.println("Host-IP: " + hostname);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        int port = 42424;

        // Falls die Vergabe eines Benutzernamen fehlschlägt --> "test" + Zufallszahl
        Random rand = new Random();
        username = "test" + Integer.toString(rand.nextInt());
        try  {
            ConsoleIn = new BufferedReader(new InputStreamReader(System.in));
            System.out.print("Your Username: ");
            String user = ConsoleIn.readLine();
            if (!user.isEmpty())
                username = user;
            System.out.print("Enter Server hostname: ");
            String host = ConsoleIn.readLine();
            if(!host.isEmpty())
                hostname = host;
            System.out.print("Enter port number: ");
            String portNum = ConsoleIn.readLine();
            if(!portNum.isEmpty())
                port = Integer.parseInt(portNum);
        }catch (IOException e){
            e.printStackTrace();
        }
        try {
            sock = new Socket(hostname, port);
            System.out.println("Connection established!");
            System.out.println("--------------------------------");
            System.out.println("");
            new Thread(new ClientThread()).start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void sendMessage(String message){
        String moddedMessage = username + " wrote: " + message + "\n";
        try {
            DataOutputStream toServer = new DataOutputStream(sock.getOutputStream());
            toServer.writeBytes(moddedMessage);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}