[2019-1] 멀티미디어통신 과제

자바로 채팅 프로그램 만들기

 

서버 부분

package talk;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Iterator;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ScrollPaneConstants;

public class VerySimpleChatServer {
 
 ArrayList clientOutputStreams;
 JTextArea status; // 서버상태를 표시할 영역
 
 public class ClientHandler implements Runnable {
  BufferedReader reader;
  Socket sock;
  
  public ClientHandler(Socket clientSocket) {
   try {
    sock = clientSocket;
    InputStreamReader isReader = new InputStreamReader(sock.getInputStream());
    reader = new BufferedReader(isReader);
    
   } catch (Exception e) {e.printStackTrace();}
  }
  
  public void run() {
   String message;
   try {
    // 메시지가 올때마다 접속한 채팅클라이언트에 모두 전달
    while((message = reader.readLine()) != null) {
     System.out.println("read : " + message);
     tellEveryone(message);
    }
   } catch (Exception e) {e.printStackTrace();}
  }
  
 }
 
 public static void main(String[] args) {
  new VerySimpleChatServer().start();
 }
  
 public void start() {
  JFrame frame = new JFrame("server status");
  JPanel mainPanel = new JPanel();
  status = new JTextArea(15,40); 
  status.setLineWrap(true); //자동 개행
  status.setWrapStyleWord(true); //행을 넘길 때 행의 마지막 단어가 두행에 걸쳐 나뉘지 않도록 하기
  status.setEditable(false);
  status.setVisible(true);
  JButton exitButton = new JButton("Exit");
  exitButton.addActionListener(new ExitButtonListener());
  JScrollPane qScroller = new JScrollPane(status);
  qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); //수직 스크롤바 표시 정책 : 항상 보여주기
  qScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);// 수평 스크롤바 표시 정책 : 항상 보여주기
  mainPanel.add(qScroller);
  mainPanel.add(exitButton);
  status.append("Chat Server Start..\n");
  
  frame.getContentPane().add(BorderLayout.CENTER, mainPanel);
  frame.setSize(500, 500);
  frame.setVisible(true);
  
  go();
 }
 
 public void go() {
    
  clientOutputStreams = new ArrayList();
  try {
   ServerSocket serverSock = new ServerSocket(5000);
   
   // 계속 새로운 채팅 클라이언트를 accept 
   while(true) {
    Socket clientSocket = serverSock.accept();
    PrintWriter writer = new PrintWriter(clientSocket.getOutputStream());
    clientOutputStreams.add(writer);
    
    Thread t = new Thread(new ClientHandler(clientSocket));
    t.start();
    //System.out.println("got a connection" + clientSocket.getPort());
    status.append("got a connection : " + clientSocket.getPort() + "\n");
   }
  } catch(Exception e) {
   e.printStackTrace();
  }
 }
 
 public class ExitButtonListener implements ActionListener {
  public void actionPerformed(ActionEvent ev) {
   try {
    System.exit(0);
   } catch(Exception e) {
    e.printStackTrace();
   }
  }
 }
 
 public void tellEveryone(String message) {
  Iterator it = clientOutputStreams.iterator();
  while(it.hasNext()) {
   try {
    PrintWriter writer = (PrintWriter) it.next();
    writer.println(message);
    writer.flush();
   } catch(Exception e) {
    e.printStackTrace();
   }
  }
 }
}

 

 

 

클라이언트 부분

package talk;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Iterator;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ScrollPaneConstants;

public class VerySimpleChatServer {
 
 ArrayList clientOutputStreams;
 JTextArea status; // 서버상태를 표시할 영역
 
 public class ClientHandler implements Runnable {
  BufferedReader reader;
  Socket sock;
  
  public ClientHandler(Socket clientSocket) {
   try {
    sock = clientSocket;
    InputStreamReader isReader = new InputStreamReader(sock.getInputStream());
    reader = new BufferedReader(isReader);
    
   } catch (Exception e) {e.printStackTrace();}
  }
  
  public void run() {
   String message;
   try {
    // 메시지가 올때마다 접속한 채팅클라이언트에 모두 전달
    while((message = reader.readLine()) != null) {
     System.out.println("read : " + message);
     tellEveryone(message);
    }
   } catch (Exception e) {e.printStackTrace();}
  }
  
 }
 
 public static void main(String[] args) {
  new VerySimpleChatServer().start();
 }
  
 public void start() {
  JFrame frame = new JFrame("server status");
  JPanel mainPanel = new JPanel();
  status = new JTextArea(15,40); 
  status.setLineWrap(true); //자동 개행
  status.setWrapStyleWord(true); //행을 넘길 때 행의 마지막 단어가 두행에 걸쳐 나뉘지 않도록 하기
  status.setEditable(false);
  status.setVisible(true);
  JButton exitButton = new JButton("Exit");
  exitButton.addActionListener(new ExitButtonListener());
  JScrollPane qScroller = new JScrollPane(status);
  qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); //수직 스크롤바 표시 정책 : 항상 보여주기
  qScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);// 수평 스크롤바 표시 정책 : 항상 보여주기
  mainPanel.add(qScroller);
  mainPanel.add(exitButton);
  status.append("Chat Server Start..\n");
  
  frame.getContentPane().add(BorderLayout.CENTER, mainPanel);
  frame.setSize(500, 500);
  frame.setVisible(true);
  
  go();
 }
 
 public void go() {
    
  clientOutputStreams = new ArrayList();
  try {
   ServerSocket serverSock = new ServerSocket(5000);
   
   // 계속 새로운 채팅 클라이언트를 accept 
   while(true) {
    Socket clientSocket = serverSock.accept();
    PrintWriter writer = new PrintWriter(clientSocket.getOutputStream());
    clientOutputStreams.add(writer);
    
    Thread t = new Thread(new ClientHandler(clientSocket));
    t.start();
    //System.out.println("got a connection" + clientSocket.getPort());
    status.append("got a connection : " + clientSocket.getPort() + "\n");
   }
  } catch(Exception e) {
   e.printStackTrace();
  }
 }
 
 public class ExitButtonListener implements ActionListener {
  public void actionPerformed(ActionEvent ev) {
   try {
    System.exit(0);
   } catch(Exception e) {
    e.printStackTrace();
   }
  }
 }
 
 public void tellEveryone(String message) {
  Iterator it = clientOutputStreams.iterator();
  while(it.hasNext()) {
   try {
    PrintWriter writer = (PrintWriter) it.next();
    writer.println(message);
    writer.flush();
   } catch(Exception e) {
    e.printStackTrace();
   }
  }
 }
}

 

 

//클라이언트 부분

package talk;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;

public class SimpleChatClient {

 JTextArea incoming; // 서버로부터 읽어온 메시지를 표시할 영역
 JTextField outgoing; // 서버로보낼 메시지를 입력할 영역
 BufferedReader reader; // 서버로부터 온 메시지를 읽어드릴 읽기버퍼
 PrintWriter writer; // 메시지를 소켓 스트림에 써줄 쓰기 스트림
 Socket sock; // 소켓
 
 public static void main(String[] args) {
  SimpleChatClient client = new SimpleChatClient();
  client.go();
 }
 
 public void go() {
  // 채팅창 UI
  JFrame frame = new JFrame("Ludicrously Simple Chat Client");
  JPanel mainPanel = new JPanel();
  incoming = new JTextArea(15,40); 
  incoming.setLineWrap(true); //자동 개행
  incoming.setWrapStyleWord(true); // 행을 넘길 때 행의 마지막 단어가 두행에 걸쳐 나뉘지 않도록 하기
  incoming.setEditable(false);
  incoming.setVisible(true);
  JScrollPane qScroller = new JScrollPane(incoming);
  qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); //수직 스크롤바 표시 정책 : 항상 보여주기
  qScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);// 수평 스크롤바 표시 정책 : 항상 보여주기
  outgoing = new JTextField(20);
  JButton sendButton = new JButton("Send");
  sendButton.addActionListener(new SendButtonListener());
  JButton exitButton = new JButton("Exit");
  exitButton.addActionListener(new ExitButtonListener());
  mainPanel.add(qScroller);
  mainPanel.add(outgoing);
  mainPanel.add(sendButton);
  mainPanel.add(exitButton);
  incoming.append("notice : UI 초기화\n");
  
  // 소켓 통신 초기화
  setUpNetWorking();
  incoming.append("notice : 소켓 통신 초기화\n");
  incoming.append("notice : 채팅에 입장하셨습니다.\n\n");
  
  // 읽기 쓰레드 생성, 시작
  Thread readerThread = new Thread(new IncomingReader());
  readerThread.start();
  
  // UI visual(정렬,크기) 설정
  frame.getContentPane().add(BorderLayout.CENTER, mainPanel);
  frame.setSize(500, 500);
  frame.setVisible(true);
 }
 
 private void setUpNetWorking() { // 클라이언트와 서버간 통신할 준비
  try {
   
   // 소켓 객체 생성
   sock = new Socket("127.0.0.1", 5000); 
   
   // 버퍼리더 + 입력스트림리더 + 소켓입력스트림 체이닝
   InputStreamReader streamReader = new InputStreamReader(sock.getInputStream());
   reader = new BufferedReader(streamReader);
   
   // printwriter + 소켓출력스트림 체이닝
   writer = new PrintWriter(sock.getOutputStream());
   
   System.out.println("networking established");
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
 // Send 버튼 리스너
 public class SendButtonListener implements ActionListener {
  
  // 버튼 눌리면
  public void actionPerformed(ActionEvent ev) {
   try {
    writer.println(outgoing.getText()); // outgoing 영역의 텍스트를 가져와 writer에 쓴다.
    writer.flush(); // 버터링 하짐 말고 바로 flush 
   } catch(Exception ex) {
    ex.printStackTrace();
   }
   outgoing.setText(""); //쓰고 나서 outgoing 영역을 비운다.
   outgoing.requestFocus(); //포커스를 텍스트창에 놓는다.
  }
 }
 
 public class ExitButtonListener implements ActionListener {
  public void actionPerformed(ActionEvent ev) {
   try {
    System.exit(0);
   } catch(Exception e) {
    e.printStackTrace();
   }
  }
 }
 
 public class IncomingReader implements Runnable {
  public void run() {
   String message;
   try {
    while ((message = reader.readLine()) != null) {
     System.out.println("read " + message);
     incoming.append(message + "\n");
    }    
   } catch (Exception e) {e.printStackTrace();}
  }
 }
}