Java 채팅 프로그램

package com.test.aa;

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

public class Server {
	public static void main(String[] args) {
		try {
			ServerSocket ss = new ServerSocket(5555);
			Socket s;
			while (true) {

				s = ss.accept();

				System.out.println("입장 : " + s.getInetAddress());
				PerClientThread pc = new PerClientThread();
				pc.s = s;
				pc.start();

			}

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
}

package com.test.aa;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.ArrayList;

public class PerClientThread extends Thread {
	public Socket s;
	public static ArrayList alp
	 = new ArrayList();
		

	@Override
	public void run() {
		PrintWriter out = null;
		BufferedReader in = null;
		try {
			out = new PrintWriter(s.getOutputStream(), true);
			alp.add(out);
			in = new BufferedReader(new InputStreamReader(s.getInputStream()));

			String inputLine;

			while ((inputLine = in.readLine()) != null) {
				System.out.println(inputLine);
				for( int i = 0 ; i < alp.size() ; i++ )
				{
					try{
						alp.get(i).println(inputLine);
					}
					catch(Exception e)
					{
						
					}
					
				}
				
			}

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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.Scanner;

import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class Client {
	static String nickName;
	public static void main(String[] args) {
		JTextField textField;
		JTextArea textArea;
		PrintWriter out;
		BufferedReader in;
		try {
			Socket s = new Socket("118.46.60.67", 5555);
			out = new PrintWriter(s.getOutputStream(), true);
			in = new BufferedReader(
					new InputStreamReader(s.getInputStream()));
						
			Scanner sc = new Scanner(System.in);
			nickName = sc.next();
			
			JFrame f = new JFrame("채팅");
			f.setSize(600, 400);
			f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
			textArea = new JTextArea();	
			textField = new JTextField(10);
			textField.addActionListener(
					new ActionListener() {
						public void actionPerformed(ActionEvent e) {
						out.println(
								nickName + " : " + 
									textField.getText());
						}
					}
			);
			f.add(textField, BorderLayout.SOUTH);
			f.add(textArea, BorderLayout.CENTER);
			f.setVisible(true);
			while(true)
			{
				textArea.append(in.readLine()+"\n");
				textField.setText("");
			}
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
}