Java Server/Client Code

Client.java

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


class MyFrame extends JFrame {
	public static JTextArea textArea;
	JTextField textField;
	PrintWriter out;
	
	public MyFrame() {
		textArea = new JTextArea();
		textField = new JTextField();
		add(BorderLayout.CENTER, textArea);
		add(BorderLayout.SOUTH, textField);
		textField.addActionListener(new FieldListener());
		setSize(300,200);
		setTitle("채팅프로그램 Client");
		setVisible(true);
		// GUI를 설계한다.
	}
	class FieldListener implements ActionListener
	{

		@Override
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub
			out.println(textField.getText());
			textField.setText("");
			// 메세지 보내기
		}		
	}
}

class SendThread extends Thread {
	PrintWriter out;
	public SendThread(PrintWriter out)
	{
		this.out = out;
	}
	@Override
	public void run() {
		// TODO Auto-generated method stub
		super.run();
	}
}

class RecvThread extends Thread {
	BufferedReader in;
	public RecvThread(BufferedReader in)
	{
		this.in = in;
	}
	@Override
	public void run() {
		String temp;
		try {
			while ((temp = in.readLine()) != null) {
				
				MyFrame.textArea.setText(
						MyFrame.textArea.getText()
						+ "\n" + temp);
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

class ClientModule {
	MyFrame mFrame;
	SendThread mSendThread;
	RecvThread mRecvThread;
	Socket s;

	// 서버에 패킷을 보내는 Thread
	// 서버로부터 패킷을 받는 Thread
	public ClientModule() // 준비
	{

		try {
			s = new Socket("192.168.10.151", 33333);
			PrintWriter out = new PrintWriter(s.getOutputStream(), true);
			BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));
			mFrame = new MyFrame(); // GUI 객체
			mFrame.out = out;
			mSendThread = new SendThread(out);
			mRecvThread = new RecvThread(in);			
		}  catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	void start() // 시작
	{
		mSendThread.start();
		mRecvThread.start();
	}
}

public class Client {
	public static void main(String[] args) {
		ClientModule cm = new ClientModule();
		// 초기화 작업
		cm.start();
		// Thread.start();
	}
}

Server.java

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

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

	@Override
	public void run() {
		// TODO Auto-generated method stub

		socketArray.add(s);
		
		BufferedReader br;
		try {
			br = new BufferedReader(new InputStreamReader(s.getInputStream()));
			String temp;
			while ((temp = br.readLine()) != null) {
				System.out.print(s.getInetAddress() + " : ");
				System.out.println(temp);
				for( int i = 0 ; i < socketArray.size() ; i++)
				{
					PrintWriter os = 
							new PrintWriter
							(socketArray.get(i).getOutputStream()
									,true);
					os.print(s.getInetAddress() + " : ");
					os.println(temp);
				}
			}

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

public class Test {
	public static void main(String[] args) throws Exception {

		System.out.println("Server Side");
		ServerSocket ss = new ServerSocket(33333);
		Socket s;
		while (true) {
			s = ss.accept();
			PerClientThread pct = new PerClientThread();
			pct.s = s;
			pct.start();
		}

	}
}