Client.java

package com.evanram.code.java.chatclient;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.ArrayList;

public class Client
{
	private static String address = "localhost";
	private static int port = 38936;
	private static String nickname = System.getProperty("user.name");
	
	public static PrintWriter out;
	public static BufferedReader in;
	
	public Client()
	{
		establishConnection(address, port);
	}
	public static void main(String... args)
	{
		if(args.length == 1)	//set defined address
			address = args[0];
		
		else if(args.length > 1)	//set defined address:port
		{
			if(args.length > 2)
			{
				nickname = args[2];
			}
			
			try
			{
				address = args[0];
				port = Integer.parseInt(args[1]);
			}
			catch(NumberFormatException e)
			{
				Message.logError("Invalid port! Using default port: " + port);
			}
		}
		
		new Client();	//try opening connection
	}
	
	public static void establishConnection(String address, int port)
	{
		try
		{
			Message.log("Establishing connection with " + address + ":" + port + ".");
			Socket socket = new Socket(address, port);	//create socket
			
			out = new PrintWriter(socket.getOutputStream(), true);
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			
			Message.log("Connected!");
			
			stream();	//send&show server stream
		}
		catch(UnknownHostException e)
		{
			Message.logError("Disconnect. Unknown host: \'" + address + "\'");
		}
		catch(IOException e)
		{
			Message.logError("Disconnect. Encountered IOException. (No server running on this port)");
		}
		
	}
	
	public static void stream()
	{
		new Thread(new PrintInputStream()).start();	//new thread, read server messages
		
		try
		{
			for(String s : entryCommands())
			{
				out.println(s);
			}
			
			while(true)
			{
				String nextInput = Message.nextInputLine();	//get next client input
				out.println(nextInput);	//send text to server
			}
		}
		catch(Exception e)
		{
			Message.logError("Connection failed!");
		}
		
	}
	
	public static ArrayList<String> entryCommands()
	{
		ArrayList<String> entryCmds = new ArrayList<String>();
		
		entryCmds.add("!nick " + nickname);
		entryCmds.add("!motd");
		entryCmds.add("!list");
		
		return entryCmds;
	}
	
	public static String getNextInput() throws IOException
	{
		return in.readLine();
	}
	
	public static void flushOutput()
	{
		out.flush();
	}
}