학원 11일차 복습(3/28)

이론

PrintWriter에서이어쓰기  true ,덮어쓰기 (디폴트) false

서버(Server): 사용자들에게 서비스를 제공하는 컴퓨터 

클라이언트(Client): 서버에게 서비스를 요청해서 사용하는 컴퓨터

소켓(socket): TCP를 사용하여 응용 프로그램끼리 통신을 하기 위한 연결 끝점(end point)

ServerSocket 클래스: 서버를 위한 소켓

Socket 클래스: 클라이언트를 위한 소켓

InetAddress는 get매서드를 호출하여서 필요한 InetAddress클래스를 받아서 사용한다. 싱글턴(new로 생성안함)

URL(Uniform Resource Location): 인터넷에서 접근 가능한 자원의 주소를 표현할 수 있는 형식을 의미한다.

입력한 호스트로 URL을 생성하고 URLConnection을 생성

        http://www.hostname.com:8080/mvtest?cmd=1000&n=300

        프로토콜://호스트:포트/파일?쿼리(param=value)

[프로토콜][host][port][path][query]

서버는 요청을 받아서 클라이언트에게 응답 , 연결된 소켓에서 스트림을 생성해서 사용

1.서버로 요청  -> 2. 서버가 요청을 받고  ->  3. 서버가 클라이언트에게 응답 -> 4.서버로부터 응답받음

블로킹메서드:  accept(), readLine();

  

실습

ex1.Ex1_InetAddr

package ex1; import java.net.InetAddress; import java.net.UnknownHostException; import java.util.Scanner; public class Ex1_InetAddr { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.print("도메인을 입력 : "); String host = sc.nextLine(); try { //getByName(host)입력값을 InetAddress클래스로 생성 InetAddress[] ia = InetAddress.getAllByName(host); for(InetAddress e : ia){ System.out.println("Host:"+e.getHostAddress()); } } catch (UnknownHostException ex) { ex.printStackTrace(); System.out.println("알수 없는 호스트 입니다."); } } }

ex1.Ex2_InetAddr

/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package ex1; import java.net.InetAddress; import java.net.UnknownHostException; import java.util.logging.Level; import java.util.logging.Logger; /** * * @author Linux */ public class Ex2_InetAddr extends javax.swing.JFrame { /** * Creates new form Ex2_InetAddr */ public Ex2_InetAddr() { initComponents(); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jPanel1 = new javax.swing.JPanel(); jLabel1 = new javax.swing.JLabel(); jButton1 = new javax.swing.JButton(); jScrollPane1 = new javax.swing.JScrollPane(); resv = new javax.swing.JTextArea(); hostv = new javax.swing.JTextField(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jPanel1.setBackground(new java.awt.Color(255, 204, 102)); jLabel1.setFont(new java.awt.Font("굴림", 0, 36)); // NOI18N jLabel1.setText("Host :"); jButton1.setText("검색"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); resv.setColumns(20); resv.setRows(5); jScrollPane1.setViewportView(resv); javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); jPanel1.setLayout(jPanel1Layout); jPanel1Layout.setHorizontalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(61, 61, 61) .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 134, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(hostv, javax.swing.GroupLayout.PREFERRED_SIZE, 373, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 109, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(35, 35, 35) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 666, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(0, 16, Short.MAX_VALUE))) .addContainerGap()) ); jPanel1Layout.setVerticalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(36, 36, 36) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(hostv, javax.swing.GroupLayout.PREFERRED_SIZE, 54, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(31, 31, 31)) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup() .addContainerGap() .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 54, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(29, 29, 29))) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 332, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(33, Short.MAX_VALUE)) ); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) ); pack(); }// </editor-fold> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { try { resv.setText(ip(hostv.getText())); } catch (UnknownHostException ex) { ex.printStackTrace(); } } private String ip(String host) throws UnknownHostException { StringBuilder sb = new StringBuilder(); //InetAddress는 get매서드를 호출하여서 필요한 //InetAddress클래스를 받아서 사용한다. //싱글턴(new로 생성안함) InetAddress[] iaArr = InetAddress.getAllByName(host); for(InetAddress remote : iaArr){ sb.append(host).append("IP의 주소는 :").append(remote.getHostAddress()).append("\n"); } return sb.toString(); } /** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(Ex2_InetAddr.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(Ex2_InetAddr.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(Ex2_InetAddr.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(Ex2_InetAddr.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new Ex2_InetAddr().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JTextField hostv; private javax.swing.JButton jButton1; private javax.swing.JLabel jLabel1; private javax.swing.JPanel jPanel1; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTextArea resv; // End of variables declaration }

ex1.Ex1_URL

package ex1; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Scanner; import java.util.Set; public class Ex1_URL { public static void main(String[] args) throws MalformedURLException, IOException { Scanner sc = new Scanner(System.in); System.out.print("Host:"); String host = sc.nextLine(); //입력한 호스트로 URL을 생성하고 URLConnection을 생성 //http://www.hostname.com:8080/mvtest?cmd=1000&n=300 //프로토콜://호스트:포트/파일?쿼리(param=value) URL url = new URL(host); URLConnection urlCon = url.openConnection(); urlCon.connect(); //해더값을 알아보기 위해서 Map으로 반환 Map<String, List<String>> map = urlCon.getHeaderFields(); Set<String> s = map.keySet(); Iterator<String> iterator= s.iterator(); while(iterator.hasNext()){ String next = iterator.next(); System.out.print(next+" : "); List<String> value = map.get(next); for(String temp : value){ System.out.println(temp); } }//end while int len = urlCon.getContentLength(); System.out.println("문서의 길이 :"+len); } }

ex1.Ex2_InputStreamURL

package ex1; //URL(Uniform Resource Location)의 약자 import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.MalformedURLException; import java.net.URL; import java.util.Scanner; //인터넷에서 접근 가능한 자원의 주소를 표현할 수 있는 형식을 의미한다. //ex)http://docs.oracle.com/javase/8/docs/api/main.jsp?name=test&id=123 //[http]://[docs.oracle.com][:80][/javase/8/docs/api/main.jsp][?name=test&id=123] //[프로토콜][host][port][path][query] //시나리오 : http://www.naver.com 의 index문서를 읽어와서 화면이 출력하려고 한다. public class Ex2_InputStreamURL { public static void main(String[] args) throws MalformedURLException, IOException { String url = "http://news.naver.com/main/read.nhn?oid=421&sid1=103&aid=0003283519&mid=shm&mode=LSD&nh=20180328105947"; //네이버에 url로 접속해주는 URL클래스를 생성해보자. URL urlv = new URL(url); //접속한 후 네이버의 서버 문서를 스트림으로 읽어오기 InputStream is = urlv.openStream(); //MIMETYPE중...... //서버의 문서의 언어지원 코딩을 클라이언트도 맞추어야 한다. BufferedReader br = new BufferedReader(new InputStreamReader(is, "EUC-KR")); String str = null; while((str = br.readLine()) != null){ System.out.println(str); } System.out.println("--------------------------------------------"); //Scanner를 사용해서 읽어낸다. Scanner sc = new Scanner(is,"UTF-8"); while(sc.hasNext()){ System.out.println(sc.nextLine()); } } }

ex1.UrlSearching

/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package ex1; import java.io.BufferedOutputStream; import java.io.BufferedWriter; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import java.util.ArrayList; import java.util.Scanner; /** * * @author Linux */ public class UrlSearching extends javax.swing.JFrame { ArrayList<String> strAr = new ArrayList<>(); /** * Creates new form UrlSearching */ public UrlSearching() { initComponents(); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jPanel1 = new javax.swing.JPanel(); jLabel1 = new javax.swing.JLabel(); jLabel2 = new javax.swing.JLabel(); jScrollPane1 = new javax.swing.JScrollPane(); resv = new javax.swing.JTextArea(); urlv = new javax.swing.JTextField(); pathv = new javax.swing.JTextField(); jButton1 = new javax.swing.JButton(); jButton2 = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jPanel1.setBackground(new java.awt.Color(255, 255, 204)); jLabel1.setText("URL : "); jLabel2.setText("Path"); resv.setColumns(20); resv.setRows(5); jScrollPane1.setViewportView(resv); jButton1.setText("Search"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); jButton2.setText("save"); jButton2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton2ActionPerformed(evt); } }); javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); jPanel1.setLayout(jPanel1Layout); jPanel1Layout.setHorizontalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(61, 61, 61) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addGroup(jPanel1Layout.createSequentialGroup() .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) .addComponent(jLabel2) .addComponent(jLabel1)) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup() .addGap(73, 73, 73) .addComponent(urlv, javax.swing.GroupLayout.PREFERRED_SIZE, 357, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(jButton1) .addGap(17, 17, 17)) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup() .addGap(58, 58, 58) .addComponent(pathv, javax.swing.GroupLayout.PREFERRED_SIZE, 320, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(jButton2) .addGap(34, 34, 34)))) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 617, javax.swing.GroupLayout.PREFERRED_SIZE)) .addContainerGap(50, Short.MAX_VALUE)) ); jPanel1Layout.setVerticalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(45, 45, 45) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel1) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(urlv, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jButton1))) .addGap(45, 45, 45) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 269, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 30, Short.MAX_VALUE) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel2) .addComponent(pathv, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jButton2)) .addGap(32, 32, 32)) ); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) ); pack(); }// </editor-fold> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { String url = urlv.getText().trim(); try { URL urlv = new URL(url); InputStream is = urlv.openStream(); URLConnection uc = urlv.openConnection(); String contype = uc.getContentType(); //인코딩타입을 가져오기 위해서 split으로 구분! String[] ct = contype.split("="); System.out.println(contype); Scanner sc = new Scanner(is, ct[1]); while (sc.hasNext()) { resv.append(sc.nextLine() + "\n"); } } catch (MalformedURLException ex) { ex.printStackTrace(); } catch (IOException ex) { ex.printStackTrace(); } } private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { try (PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(pathv.getText())), true);) { pw.println(resv.getText()); } catch (IOException ex) { } } /** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(UrlSearching.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(UrlSearching.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(UrlSearching.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(UrlSearching.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new UrlSearching().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JButton jButton2; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JPanel jPanel1; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTextField pathv; private javax.swing.JTextArea resv; private javax.swing.JTextField urlv; // End of variables declaration }

ex2.Ex1_Server

package ex2; import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; public class Ex1_Server { public Ex1_Server() { try (ServerSocket ss = new ServerSocket(9999)) { System.out.println("Server Start!!"); while (true) { //클라이언트가 서버에 접속시에 동작하는 메서드 Socket s = ss.accept(); System.out.println("Client Connect :" + "" + s.getInetAddress().getHostAddress()); //서버는 요청을 받아서 클라이언트에게 응답 //연결된 소켓에서 스트림을 생성해서 사용 InputStream is = s.getInputStream(); OutputStream os = s.getOutputStream(); //2차스트림을 사용해서 개선 BufferedReader br = new BufferedReader(new InputStreamReader(is)); PrintWriter pw = new PrintWriter(new BufferedOutputStream(os), true); //2.번 서버가 요청을 받고 String msg = br.readLine(); //3.번 서버가 클라이언트에게 응 pw.println("ServerMsg :" + msg); } } catch (IOException ex) { ex.printStackTrace(); } } public static void main(String[] args) { new Ex1_Server(); } }

ex2.Ex1_Client

package ex2; import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; public class Ex1_Client { public Ex1_Client() { try (Socket s = new Socket("192.168.0.118", 9999)) { //서버는 요청을 받아서 클라이언트에게 응답 //연결된 소켓에서 스트림을 생성해서 사용 InputStream is = s.getInputStream(); OutputStream os = s.getOutputStream(); //2차스트림을 사용해서 개선 BufferedReader br = new BufferedReader(new InputStreamReader(is)); PrintWriter pw = new PrintWriter(new BufferedOutputStream(os), true); String msg = "하이"; pw.println("Client :"+msg);//1.서버로 요청 String svmsg = br.readLine(); //4.서버로부터 응답받음 System.out.println(svmsg); } catch (IOException ex) { ex.printStackTrace(); } } public static void main(String[] args) { new Ex1_Client(); } }

ex2.Ex3_Server

package ex2; import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; import java.util.Properties; public class Ex3_Server { private ServerSocket ss; private Properties prop;// public Ex3_Server() { try { prop = new Properties();// ss = new ServerSocket(9999); System.out.println("Server Start!"); // 무한적으로 대기 while (true) { // Client Socket이 접속 되었을 때 동작하는 블록킹 메서드 Socket s = ss.accept(); String ip = s.getInetAddress().getHostAddress(); System.out.println("Server Log 1:" + ip + "에서 접속 했음!"); while (true) { InputStream is = s.getInputStream(); OutputStream os = s.getOutputStream(); BufferedReader br = new BufferedReader( new InputStreamReader(is)); PrintWriter pw = new PrintWriter( new BufferedOutputStream(os), true); String msg = br.readLine(); prop.load(new BufferedReader( new FileReader("src/ex2/msg.properties")));// if (msg != null) { System.out.println("Server Log 2:" + msg); StringBuffer sb = new StringBuffer(); sb.append("IP:").append(ip).append(":"); sb.append(prop.getProperty(msg, "아직 배우지 못한 말입니다.ㅜㅜ"));// pw.println(sb.toString()); } } } } catch (IOException ex) { ex.printStackTrace(); } } public static void main(String[] args) { new Ex3_Server(); } }

ex2.Ex3_Client

/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package ex2; import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; import java.net.Socket; /** * * @author Linux */ public class Ex3_Client extends javax.swing.JFrame { // 클라이언트 소켓 및 스트림 선언 private Socket s; private BufferedReader br; private PrintWriter pw; public Ex3_Client() { try { s = new Socket("localhost", 9999); //1차 스트림 : 연결된 socket으로 부터 통신을 하기위한 기본 Stream InputStream is = s.getInputStream(); OutputStream os = s.getOutputStream(); //2차 스트림 : 기능향상 br = new BufferedReader(new InputStreamReader(is)); pw = new PrintWriter( new BufferedOutputStream(os), true); } catch (IOException ex) { } initComponents(); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jPanel1 = new javax.swing.JPanel(); jLabel1 = new javax.swing.JLabel(); msgv = new javax.swing.JTextField(); jScrollPane1 = new javax.swing.JScrollPane(); resv = new javax.swing.JTextArea(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jPanel1.setBackground(new java.awt.Color(255, 255, 204)); jLabel1.setText("MSG:"); msgv.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { msgvActionPerformed(evt); } }); resv.setColumns(20); resv.setRows(5); jScrollPane1.setViewportView(resv); javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); jPanel1.setLayout(jPanel1Layout); jPanel1Layout.setHorizontalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(79, 79, 79) .addComponent(jLabel1) .addGap(67, 67, 67) .addComponent(msgv, javax.swing.GroupLayout.PREFERRED_SIZE, 378, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(48, 48, 48) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 659, javax.swing.GroupLayout.PREFERRED_SIZE))) .addContainerGap(40, Short.MAX_VALUE)) ); jPanel1Layout.setVerticalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(50, 50, 50) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel1) .addComponent(msgv, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(18, 18, 18) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 363, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(25, Short.MAX_VALUE)) ); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) ); pack(); }// </editor-fold> private void msgvActionPerformed(java.awt.event.ActionEvent evt) { try { // 서버로 메시지를 전송 pw.println(msgv.getText().trim()); // 받아서 출력 String serverMsg = br.readLine(); resv.append(serverMsg + "\n"); } catch (IOException ex) { } } /** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(Ex3_Client.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(Ex3_Client.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(Ex3_Client.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(Ex3_Client.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new Ex3_Client().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JLabel jLabel1; private javax.swing.JPanel jPanel1; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTextField msgv; private javax.swing.JTextArea resv; // End of variables declaration }