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eomjinyoungeomjinyoung
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add exam02
1 parent 5ce6c71 commit 694dd8c

3 files changed

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‎Lesson01/src/com/eomjinyoung/lesson01/exam02/client/CalculatorAgent.java‎

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package com.eomjinyoung.lesson01.exam02.client;
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import java.io.PrintStream;
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import java.net.Socket;
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import java.util.Scanner;
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public class CalculatorAgent {
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String ip;
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int port;
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public CalculatorAgent(String ip, int port) {
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this.ip = ip;
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this.port = port;
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}
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public double compute(String operator, double a, double b) throws Exception {
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Socket socket = null;
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PrintStream out = null;
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Scanner in = null;
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try {
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socket = new Socket(ip, port);
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out = new PrintStream(socket.getOutputStream());
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in = new Scanner(socket.getInputStream());
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out.println(operator);
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out.println(a);
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out.println(b);
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out.flush();
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String state = in.nextLine();
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if (state.equals("success")) {
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return Double.parseDouble(in.nextLine());
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} else {
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throw new Exception(in.nextLine());
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}
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} catch (Exception e) {
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throw e;
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} finally {
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try {out.close();} catch(Exception e) {}
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try {in.close();} catch(Exception e) {}
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try {socket.close();} catch(Exception e) {}
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}
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}
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}

‎Lesson01/src/com/eomjinyoung/lesson01/exam02/client/CalculatorFrame.java‎

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package com.eomjinyoung.lesson01.exam02.client;
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import java.awt.Container;
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import java.awt.Dimension;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import javax.swing.Box;
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import javax.swing.BoxLayout;
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import javax.swing.JButton;
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import javax.swing.JComboBox;
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import javax.swing.JFrame;
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import javax.swing.JOptionPane;
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import javax.swing.JTextField;
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@SuppressWarnings("serial")
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public class CalculatorFrame extends JFrame implements ActionListener{
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CalculatorAgent calcAgent = new CalculatorAgent("localhost", 8888);
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JTextField operand1 = new JTextField(4);
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JTextField operand2 = new JTextField(4);
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String[] operatorData = {"+", "-", "*", "/"};
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JComboBox<String> operator = new JComboBox<String>(operatorData);
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JButton equal = new JButton("=");
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JTextField result = new JTextField(6);
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JButton clear = new JButton("Clear");
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public CalculatorFrame() {
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this.setTitle("Lesson01-Exam01");
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Container contentPane = this.getContentPane();
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contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));
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contentPane.add(Box.createVerticalGlue());
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contentPane.add(this.createInputForm());
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contentPane.add(this.createToolBar());
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contentPane.add(Box.createVerticalGlue());
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this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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this.pack();
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this.setLocationRelativeTo(null);
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}
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@Override
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public void actionPerformed(ActionEvent event) {
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if (event.getSource() == equal) {
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compute();
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} else {
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clearForm();
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}
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}
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private void compute() {
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double a = Double.parseDouble(operand1.getText());
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double b = Double.parseDouble(operand2.getText());
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double r = 0;
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try {
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r = calcAgent.compute(operator.getSelectedItem().toString(), a, b);
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result.setText(Double.toString(r));
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} catch (Exception err) {
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JOptionPane.showMessageDialog(
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null, err.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
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}
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}
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private void clearForm() {
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this.operand1.setText("");
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this.operand2.setText("");
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this.result.setText("");
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}
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private Box createInputForm() {
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Box box = Box.createHorizontalBox();
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box.setMaximumSize(new Dimension(300, 30));
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box.setAlignmentY(Box.CENTER_ALIGNMENT);
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box.add(operand1);
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box.add(operator);
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box.add(operand2);
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box.add(equal);
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box.add(result);
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equal.addActionListener(this);
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return box;
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}
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private Box createToolBar() {
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Box box = Box.createHorizontalBox();
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box.add(clear);
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clear.addActionListener(this);
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return box;
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}
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public static void main(String[] args) {
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CalculatorFrame app = new CalculatorFrame();
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app.setVisible(true);
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}
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}

‎Lesson01/src/com/eomjinyoung/lesson01/exam02/server/CalculatorServer.java‎

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package com.eomjinyoung.lesson01.exam02.server;
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import java.io.PrintStream;
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import java.net.ServerSocket;
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import java.net.Socket;
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import java.util.Scanner;
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public class CalculatorServer {
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private int port;
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public CalculatorServer(int port) {
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this.port = port;
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}
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public void service() throws Exception {
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ServerSocket serverSocket = new ServerSocket(port);
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System.out.println("CalculatorServer startup:");
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Socket socket = null;
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while(true) {
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try {
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System.out.println("waiting client...");
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socket = serverSocket.accept();
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System.out.println("connected to client.");
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processRequest(socket);
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System.out.println("closed client.");
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} catch (Throwable e) {
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System.out.println("connection error!");
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}
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}
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}
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private void processRequest(Socket socket) throws Exception {
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Scanner in = new Scanner(socket.getInputStream());
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PrintStream out = new PrintStream(socket.getOutputStream());
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String operator = in.nextLine();
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double a = Double.parseDouble(in.nextLine());
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double b = Double.parseDouble(in.nextLine());
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double r = 0;
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try {
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switch (operator) {
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case "+": r = a + b; break;
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case "-": r = a - b; break;
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case "*": r = a * b; break;
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case "/":
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if (b == 0) throw new Exception("0 으로 나눌 수 없습니다!");
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r = a / b; break;
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default:
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throw new Exception("해당 연산을 지원하지 않습니다!");
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}
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out.println("success");
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out.println(r);
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} catch (Exception err) {
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out.println("failure");
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out.println(err.getMessage());
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}
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out.close();
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in.close();
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socket.close();
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}
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public static void main(String[] args) throws Exception {
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CalculatorServer app = new CalculatorServer(8888);
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app.service();
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}
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}
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