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명품 JAVA Programming 제 15장 실습문제 (1, 4, 7, 8 제외) 본문

Java

명품 JAVA Programming 제 15장 실습문제 (1, 4, 7, 8 제외)

_mojo_ 2021. 8. 23. 20:24

2번 Code

 

Server Code

 

package Part15;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.*;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import java.net.*;


public class ServerEx {
	private static BufferedReader in = null;
	private static BufferedWriter out = null;
	private static ServerSocket listener = null;
	private static Socket socket = null;
	private static Scanner scanner = new Scanner(System.in);
	
	private static MyThread mt;
	
	class MyThread implements Runnable{
		private boolean flag = false;
		
		public void connect() {
			flag = true;
		}
		
		public boolean getFlag() {
			return flag;
		}
		
		public void run() {
			int x=0;
			while(x < 20) {
				try {
					Thread.sleep(500);
					if(flag == true) {
						out.write(x +"\n");
						out.flush();
						x++;
					}
				} catch(InterruptedException | IOException e) { return; }
			}
			flag = false;
		}
	}
	
	ServerEx(){
		mt = new MyThread();
		Thread th = new Thread(mt);
		th.start();
	}
	
	public static void main(String[] args) {

		new ServerEx();
		
		try {
			System.out.println("타임서버입니다.");
			listener = new ServerSocket(9999);
			socket = listener.accept();
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
			mt.connect();
			System.out.println("연결되었습니다.");
			System.out.println("500ms마다 수를 보냅니다.");
			while(true) {
				String inputMessage = in.readLine();
				if(inputMessage.equalsIgnoreCase("disconnect")) {
					System.out.println("접속을 종료합니다.");
					break;
				}			
			}
		} catch(IOException e) {
			System.out.println(e.getMessage());
		}
		finally {
			try {
				scanner.close();
				socket.close();
				listener.close();
			} catch(IOException e) {
				System.out.println("클라이언트와 채팅 중 오류가 발생했습니다.");
			}
		}
	}
	
}

 

Client Code

 

package Part15;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.*;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import java.net.*;


public class ClientEx {
	private static BufferedReader in = null;
	private static BufferedWriter out = null;
	private static Socket socket = null;
	private static Scanner scanner = new Scanner(System.in);
	
	public static void main(String[] args) {
		
		try {
			socket = new Socket("localhost", 9999);
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
			System.out.println("서버에 접속하였습니다...");
			System.out.print("서버의 시간 : ");
			int cnt = 0;
			while(cnt < 20) {
				String inputMessage = in.readLine();
				System.out.print(inputMessage + " ");
				cnt++;
			}
			out.write("disconnect\n");
			out.flush();
		} catch(IOException e) {
			System.out.println(e.getMessage());
		}
		finally {
			try {
				System.out.println("연결을 종료합니다.");
				scanner.close();
				socket.close();
			} catch(IOException e) {
				System.out.println("클라이언트와 채팅 중 오류가 발생했습니다.");
			}
		}
	}
	
}

 

 

Program을 작성해서 Server 측에서 종료되지 못한 경우 해결방법

 

1. netstat -ano 입력

 

2. 위 코드에서는 9999번 포트를 설정하였으므로 9999번 포트에 해당하는 프로세스 아이디(PID) 를 찾는다.

 

3. 해당 프로세스 아이디를 kill 한다. => taskkill /f /pid 프로세스 아이디

 

 

3번 Code

 

Server Code

 

package Part15;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.*;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import java.net.*;


public class ServerEx {
	private static BufferedReader in = null;
	private static BufferedWriter out = null;
	private static ServerSocket listener = null;
	private static Socket socket = null;
	private static Scanner scanner = new Scanner(System.in);
	
	public static String calc(String s) {
		String ret="";
		StringTokenizer st = new StringTokenizer(s);
		if(st.countTokens() != 3) ret = "잘못된 연산";

		int op1 = Integer.parseInt(st.nextToken());
		String opcode = st.nextToken();
		int op2 = Integer.parseInt(st.nextToken());
		switch(opcode){
			case "+": ret = Integer.toString(op1 + op2);
				break;
			case "-": ret = Integer.toString(op1 - op2);
				break;
			case "*": ret = Integer.toString(op1 * op2);
				break;
			default : ret = "잘못된 연산";
		}

		return ret;
	}
	
	public static void main(String[] args) {
		
		try {
			listener = new ServerSocket(9999);
			socket = listener.accept();
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
			System.out.println("클라이언트 연결됨");
			while(true) {
				String inputMessage = in.readLine();
				if(inputMessage.equalsIgnoreCase("bye")) {
					System.out.println("접속을 종료합니다.");
					break;
				}
				String result = calc(inputMessage);
				System.out.println(inputMessage+ " = " + result);
				out.write(result + "\n");
				out.flush();
			}
		} catch(IOException e) {
			System.out.println(e.getMessage());
		}
		finally {
			try {
				System.out.println("프로그램을 종료합니다.");
				scanner.close();
				socket.close();
				listener.close();
			} catch(IOException e) {
				System.out.println("클라이언트와 채팅 중 오류가 발생했습니다.");
			}
		}
	}
	
}

 

Client Code

 

package Part15;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.*;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import java.net.*;


public class ClientEx extends JFrame {
	private static BufferedReader in = null;
	private static BufferedWriter out = null;
	private static Socket socket = null;
	private static Scanner scanner = new Scanner(System.in);
	
	private static JTextField []tf = new JTextField[3];
	private JLabel jl = new JLabel("=");
	private static JTextField resTf = new JTextField(6);
	private JButton jb = new JButton("계산");
	
	ClientEx(){
		setTitle("14장 연습하기");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		c.setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));
		
		tf[0] = new JTextField(6);
		tf[1] = new JTextField(2);
		tf[2] = new JTextField(6);
		
		c.add(tf[0]); c.add(tf[1]); c.add(tf[2]);
		c.add(jl);
		c.add(resTf);
		
		jb.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if(tf[0].getText().equals("bye")) {
					try {
						out.write("bye\n");
						out.flush();
						scanner.close();
						socket.close();
						System.exit(0);
					} catch(IOException e2) {
						System.out.println("클라이언트와 채팅 중 오류가 발생했습니다.");
					}
				}
				else {
					String ret = tf[0].getText()+" "+tf[1].getText()+" "+tf[2].getText();
					try {
						out.write(ret+"\n");
						out.flush();
					} catch (IOException e1) {
						System.out.println(e1.getMessage());
					}	
				}
			}
		});
		
		c.add(jb);
		
		setSize(400, 100); 
		setVisible(true);
	}
	
	public static void main(String[] args) {
		
		try {
			socket = new Socket("localhost", 9999);
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
			new ClientEx();
			while(true) {
				String inputMessage = in.readLine();
				resTf.setText(inputMessage);				
			}
		} catch(IOException e) {
			System.out.println(e.getMessage());
		}
	}
	
}

 

 

5번 Code

 

Server Code

 

package Part15;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.*;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import java.net.*;

class Score{
	private String name, score;
	
	Score(String name, String score){
		this.name = name;
		this.score = score;
	}
	
	String getName() {
		return name;
	}
	
	String getScore() {
		return score;
	}
}

public class ServerEx {
	private static BufferedReader in = null;
	private static BufferedWriter out = null;
	private static ServerSocket listener = null;
	private static Socket socket = null;
	private static Scanner scanner;
	private static Vector<Score> v = new Vector<Score>();
	
	public static void setScore() {
		try {
			scanner=new Scanner(new FileReader("C:\\Temp\\score.txt"));
			while(scanner.hasNext()){
				String word=scanner.nextLine();
				String []score = word.split(" ");
				v.add(new Score(score[0], score[1]));
			}
			System.out.println("score.txt 읽기 완료");
		} catch(IOException e) {
			System.out.println("입출력 오류");
		}
	}
	
	public static String getResult(String name) {
		String ret = "없는 이름";
		for(int i=0; i<v.size(); i++) {
			if(name.equals(v.get(i).getName())) {
				ret = v.get(i).getScore();
			}
		}
		return ret;
	}
	
	public static void main(String[] args) {
		
		setScore();
		scanner = new Scanner(System.in);
		
		try {
			listener = new ServerSocket(9999);
			socket = listener.accept();
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
			System.out.println("클라이언트 연결됨");
			while(true) {
				String inputMessage = in.readLine();
				if(inputMessage.equalsIgnoreCase("bye")) {
					System.out.println("접속을 종료합니다.");
					break;
				}
				String result = getResult(inputMessage);
				System.out.println(inputMessage+ " : " + result);
				out.write(result + "\n");
				out.flush();
			}
		} catch(IOException e) {
			System.out.println(e.getMessage());
		}
		finally {
			try {
				System.out.println("프로그램을 종료합니다.");
				scanner.close();
				socket.close();
				listener.close();
			} catch(IOException e) {
				System.out.println("클라이언트와 채팅 중 오류가 발생했습니다.");
			}
		}
	}
	
}

 

Client Code

 

package Part15;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.*;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import java.net.*;


public class ClientEx extends JFrame {
	private static BufferedReader in = null;
	private static BufferedWriter out = null;
	private static Socket socket = null;
	private static Scanner scanner = new Scanner(System.in);
	
	private static JLabel resJl = new JLabel(" ");
	private JTextField tf = new JTextField(7);
	
	ClientEx(){
		setTitle("14장 연습하기");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		c.setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));
		
		c.add(new JLabel("이름 입력"));
		
		tf.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				JTextField jtf = (JTextField)(e.getSource());
				String s = jtf.getText();
				try {
					out.write(s+"\n");
					out.flush();
					if(s.equals("bye")) System.exit(0);
				} catch (IOException e1) {
					e1.printStackTrace();
				}
			}
		});
		
		c.add(tf);
		c.add(new JLabel("성적"));
		c.add(resJl);
		
		setSize(400, 100); 
		setVisible(true);
	}
	
	public static void main(String[] args) {
		
		try {
			socket = new Socket("localhost", 9999);
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
			new ClientEx();
			while(true) {
				String inputMessage = in.readLine();
				resJl.setText(inputMessage);				
			}
		} catch(IOException e) {
			System.out.println(e.getMessage());
		}
	}
	
}

 

 

6번 Code

 

Server Code

 

package Part15;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.*;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import java.net.*;

class Word {
	private String eng, han;
	
	Word(String eng, String han){
		this.eng = eng;
		this.han = han;
	}
	
	String getEng() {
		return eng;
	}
	
	String getHan() {
		return han;
	}
}

public class ServerEx extends JFrame {
	private static BufferedReader in = null;
	private static BufferedWriter out = null;
	private static ServerSocket listener = null;
	private static Socket socket = null;
	private static Scanner scanner = new Scanner(System.in);
	private static Vector<Word> v = new Vector<Word>();
	
	private String []ls = {"영어", "한글"};
	private JTextField []tf = new JTextField[2];
	private String []bs = {"저장", "찾기"};
	private JButton []btn = new JButton[2];
	private JTextArea ta = new JTextArea(7,25);
	
	public static String getResult(String eng) {
		String ret = "없는 단어";
		for(int i=0; i<v.size(); i++) {
			if(eng.equals(v.get(i).getEng())) {
				ret = v.get(i).getHan();
			}
		}
		return ret;
	}
	
	class MyActionListener implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			JButton jb = (JButton)(e.getSource());
			if(jb.getText().equals("저장")) {
				String eng = tf[0].getText(), han = tf[1].getText();
				v.add(new Word(eng, han));
				ta.setText(ta.getText()+"삽입 ("+eng+", "+han+")\n");
			}
			else {
				String res = getResult(tf[0].getText());
				tf[1].setText(res);
				ta.setText(ta.getText()+"검색 ("+tf[0].getText()+")\n");
			}
		}
	}
	
	ServerEx(){
		setTitle("14장 연습하기");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		c.setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));
		
		for(int i=0; i<2; i++) {
			c.add(new JLabel(ls[i]));
			tf[i] = new JTextField(10);
			c.add(tf[i]);
		}
		
		for(int i=0; i<2; i++) {
			btn[i] = new JButton(bs[i]);
			btn[i].addActionListener(new MyActionListener());
			c.add(btn[i]);
		}
		
		ta.setText("");
		c.add(new JScrollPane(ta));
		
		setSize(350, 300); 
		setVisible(true);
	}
	
	public static void main(String[] args) {
		
		try {
			listener = new ServerSocket(9999);
			socket = listener.accept();
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
			new ServerEx();
			while(true) {
				String inputMessage = in.readLine();
				if(inputMessage.equalsIgnoreCase("bye")) {
					System.out.println("접속을 종료합니다.");
					break;
				}
				String result = getResult(inputMessage);
				System.out.println("Ok~!");
				out.write(result + "\n");
				out.flush();
			}
		} catch(IOException e) {
			System.out.println(e.getMessage());
		}
		finally {
			try {
				scanner.close();
				socket.close();
				listener.close();
			} catch(IOException e) {
				System.out.println("클라이언트와 채팅 중 오류가 발생했습니다.");
			}
		}
	}
	
}

 

Client Code

 

package Part15;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.*;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import java.net.*;


public class ClientEx extends JFrame {
	private static BufferedReader in = null;
	private static BufferedWriter out = null;
	private static Socket socket = null;
	private static Scanner scanner = new Scanner(System.in);
	
	private String ls[] = {"영어", "한글"};
	private static JTextField tf[] = new JTextField[2];
	private JButton btn = new JButton("찾기");
	
	ClientEx(){
		setTitle("14장 연습하기");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		c.setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));
		
		for(int i=0; i<2; i++) {
			c.add(new JLabel(ls[i]));
			tf[i] = new JTextField(7);
			c.add(tf[i]);
		}
		
		btn.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String eng = tf[0].getText();
				try {
					out.write(eng + "\n");
					out.flush();	
					if(eng.equals("bye")) System.exit(0);
				} catch(IOException e1) {
					System.out.println(e1.getMessage());
				}
			}
		});
		
		c.add(btn);
		
		setSize(400, 100); 
		setVisible(true);
	}
	
	public static void main(String[] args) {
		
		try {
			socket = new Socket("localhost", 9999);
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
			new ClientEx();
			while(true) {
				String inputMessage = in.readLine();
				tf[1].setText(inputMessage);				
			}
		} catch(IOException e) {
			System.out.println(e.getMessage());
		}
	}
	
}

 

 

 

 

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