[Day18] Chat

Client

package chat;

import java.io.IOException;
import java.net.Socket;
import java.util.Scanner;

public class Client {
	public static void main(String[] args) {
		
		Socket so = null;
		String host;
		int port = 7777;
		Scanner sc = new Scanner(System.in);
		
		System.out.print("접속할 서버의 주소 입력 : ");
		host = sc.nextLine();
		
		try {
			so = new Socket(host, port);
			Thread sender = new Thread(new ChatSender(so, sc));
			Thread reciver = new Thread(new ChatReciver(so));
			sender.start();
			reciver.run();
			
		} catch (IOException e) {
			e.printStackTrace();
			
		} finally {
			sc.close();
		}
	}
}

Server

package chat;

import java.io.IOException;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.Scanner;

public class Server {
	
	// 서버 컴퓨터의 IP 중에서 가상 IP이거나 루프백 IP를 제외한 실제 IP를 찾아주는 메서드
	private static String getLocalServerIp() {
		try	{
		    for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();)  {
		        NetworkInterface intf = en.nextElement();
		        for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();)  {
		            InetAddress ia = enumIpAddr.nextElement();
		            if (!ia.isLoopbackAddress() && !ia.isLinkLocalAddress() && ia.isSiteLocalAddress()) {
		            	return ia.getHostAddress();
		            }
		        }
		    }
		}
		catch (SocketException ex) {}
		return null;
	}
	
	public static void main(String[] args) {
		
		ServerSocket ss;
		Socket so;
		Scanner sc = new Scanner(System.in);

		System.out.println("현재 컴퓨터의 IP는 [" + getLocalServerIp() + "] 입니다");
		System.out.println("서버 생성. 접속 대기중...");
		
		try {
			ss = new ServerSocket(7777);
			so = ss.accept();
			
			Thread sender = new Thread(new ChatSender(so, sc));
			Thread reciver = new Thread(new ChatReciver(so));
			sender.start();
			reciver.run();
			
		} catch (IOException e) {
			e.printStackTrace();
			
		} finally {
			sc.close();
		}
	}
}

CharReciver

package chat;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.SocketException;
import java.util.NoSuchElementException;

public class ChatReciver implements Runnable {

	private BufferedReader br;
	private Socket so;
	
	public ChatReciver(Socket so) {
		try {
			this.so = so;
			br = new BufferedReader(new InputStreamReader(so.getInputStream()));
			
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	@Override
	public void run() {
		String msg;
		try {
			while(true) {
				msg = br.readLine();
				if(msg == null || msg.equals("exit")) {
					break;
				}
				System.out.println(msg);
			}
		} catch(NoSuchElementException | SocketException e) {
			System.out.println("종료됨");
			
		} catch (IOException e) {
			e.printStackTrace();
			
		} finally {
			try { br.close(); } catch(Exception e) {}
			try { so.close(); } catch(Exception e) {}
		}
	}

}

ChatSender

package chat;

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

import java.util.Scanner;

public class ChatSender implements Runnable {

	private Scanner sc;
	private Socket so;
	private PrintWriter pw;
	
	public ChatSender(Socket so, Scanner sc) {
		try {
			this.so = so;
			this.sc = sc;
			pw = new PrintWriter(so.getOutputStream());
			
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	@Override
	public void run() {
		String name;
		String msg;
		System.out.print("채팅에 사용할 닉네임 입력 : ");
		name = sc.nextLine();
		
		while(true) {
			System.out.print("보낼 메시지 입력 : ");
			msg = sc.nextLine();
			pw.printf("\n%s] %s\n", name, msg);
			pw.flush();
			if(msg.equals("exit")) {
				break;
			}
		}
		pw.close();
		try { so.close(); } catch(Exception e) {}
	}
}