本站電子書

您可以在這些電子書店找到本站電子書: Google Play 圖書iBooks StoreHyReadReadmooPubu
===>>>本站推出學習遊戲意見調查<<<===《如何自學程式設計》入選 Google Play 台灣地區2016年度最佳書籍

Java 入門指南 - EncryptorGUI.java




EncryptorGUI.java 的程式原始碼如下

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import encryptor.Encrypt;
import java.io.*;

public class EncryptorGUI {
    // 屬性區
    private JFrame frame;
    private ArrayList<JComponent> GUIComponent;
    private String[] name;
    private int att[][];
    private Encrypt e;
    private String userinput;
    private String result;
    
    // 設定屬性的建構子
    public EncryptorGUI() {
        // fill 、 anchor 、 n 為常數
        int fill[]  =  { GridBagConstraints.BOTH,
                         GridBagConstraints.VERTICAL,
                         GridBagConstraints.HORIZONTAL,
                         GridBagConstraints.NONE};
        int anchor[] = { GridBagConstraints.CENTER,
                         GridBagConstraints.EAST,
                         GridBagConstraints.SOUTHEAST,
                         GridBagConstraints.SOUTH,
                         GridBagConstraints.SOUTHWEST,
                         GridBagConstraints.WEST,
                         GridBagConstraints.NORTHWEST,
                         GridBagConstraints.NORTH,
                         GridBagConstraints.NORTHEAST};
        int a[][] = {{0, 0, 1, 1, 0, 0, fill[3], anchor[5]}, 
                     {0, 1, 1, 1, 0, 0, fill[3], anchor[5]}, 
                     {0, 3, 7, 1, 0, 0, fill[3], anchor[5]}, 
                     {1, 0, 6, 1, 0, 0, fill[0], anchor[5]},
                     {1, 1, 6, 1, 0, 0, fill[0], anchor[5]}, 
                     {0, 2, 1, 1, 0, 0, fill[0], anchor[0]}, 
                     {1, 2, 1, 1, 0, 0, fill[0], anchor[0]}, 
                     {2, 2, 1, 1, 0, 0, fill[0], anchor[0]},
                     {3, 2, 1, 1, 0, 0, fill[0], anchor[0]}, 
                     {4, 2, 1, 1, 0, 0, fill[0], anchor[0]}, 
                     {5, 2, 1, 1, 0, 0, fill[0], anchor[0]}, 
                     {6, 2, 1, 1, 0, 0, fill[0], anchor[0]}};
        String n[] = {"Input", 
                      "Output", 
                      "hint...", 
                      "New", 
                      "Load", 
                      "Save", 
                      "Encode", 
                      "Decode", 
                      "Clear", 
                      "Copy"};
        
        // 以下用以上的常數設定所需屬性
        name = n;
        att = a;
        e = null; // null 表示指向虛無的參考
        userinput = "";
        result = "";
        frame = new JFrame();
        GUIComponent = new ArrayList<JComponent>(12);
    }
    
    // run() 為建立視窗的函數
    public void run() {
        frame.setSize(600, 160);
        frame.setLayout(new GridBagLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        // 以下建立視窗元件
        int i;
        for (i = 0; i < 3; i++) {
            JLabel nLabel = new JLabel(name[i]);
            GUIComponent.add(nLabel);
        }
        for (i = 0; i < 2; i++) {
            JTextField nText = new JTextField("", 32);
            GUIComponent.add(nText);
        }
        for (i = 3; i < 10; i++) {
            JButton nButton = new JButton(name[i]);
            GUIComponent.add(nButton);
        }
        for (i = 0; i < GUIComponent.size(); i++) {
            addComponent(i);
        } 
        
        // 以下個視窗元件註冊所要處理的事件
        JTextField t = (JTextField) GUIComponent.get(3);
        t.addActionListener(new InputListener());
        t.addCaretListener(new InputListener());
        t = (JTextField) GUIComponent.get(4);
        t.addActionListener(new OutputListener());
        JButton b = (JButton) GUIComponent.get(5);
        b.addActionListener(new NewListener());
        b = (JButton) GUIComponent.get(6);
        b.addActionListener(new LoadListener());
        b = (JButton) GUIComponent.get(7);
        b.addActionListener(new SaveListener());
        b = (JButton) GUIComponent.get(8);
        b.addActionListener(new EncodeListener());
        b = (JButton) GUIComponent.get(9);
        b.addActionListener(new DecodeListener());
        b = (JButton) GUIComponent.get(10);
        b.addActionListener(new ClearListener());
        b = (JButton) GUIComponent.get(11);
        b.addActionListener(new CopyListener());
        
        frame.setVisible(true);
    }
    
    // 設定 GridBagConstraints 的函數
    private void addComponent(int i) {
        GridBagConstraints c = new GridBagConstraints();
        int a[] = att[i]; 
        
        c.gridx = a[0];
        c.gridy = a[1];
        c.gridwidth = a[2];
        c.gridheight = a[3];
        c.weightx = a[4];
        c.weighty = a[5];
        c.fill = a[6];
        c.anchor = a[7];
        frame.add(GUIComponent.get(i), c);
    }
    
    // 使用者輸入文字方塊的事件
    class InputListener implements ActionListener, CaretListener {
        public void actionPerformed(ActionEvent event) {
            JTextField t2 = (JTextField) GUIComponent.get(3);
            userinput = t2.getText();
            
            JLabel t1 = (JLabel) GUIComponent.get(2);
            t1.setText("This is Input textfield. Your input is \'" + userinput + "\'");
        }
        
        public void caretUpdate(CaretEvent event) {
            JTextField t2 = (JTextField) GUIComponent.get(3);
            userinput = t2.getText();
            
            JLabel t1 = (JLabel) GUIComponent.get(2);
            t1.setText("This is Input textfield. Your input is \'" + userinput + "\'");
        } 
    }
    
    // 輸出文字方塊的事件
    class OutputListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            JLabel t = (JLabel) GUIComponent.get(2);
            t.setText("This is Output textfield. Why do you do this?");
        }
    }
    
    // 建立新 Encrypt 物件的事件
    class NewListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            e = new Encrypt();
            
            JLabel t = (JLabel) GUIComponent.get(2);
            t.setText("This is New button. A new Encrypt object is built.");
        }
    }
    
    // 載入已儲存 Encrypt 物件檔案的事件
    class LoadListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            JLabel t1 = (JLabel) GUIComponent.get(2);
            JTextField t2 = (JTextField) GUIComponent.get(4);
            
            try {
                FileInputStream fs = new FileInputStream("encryptor.ser");
                ObjectInputStream is = new ObjectInputStream(fs);
                e = (Encrypt) is.readObject();
                is.close();
                fs.close();
                t1.setText("This is Load button. Encrypt object is loaded.");
            }
            catch (Exception ex) {
                ex.printStackTrace();
                t1.setText("This is Load button.  Encrypt object is not loaded.");
            }
            finally {
                t2.setText("after Load .....");
            }
        }
    }
    
    // 儲存 Encrypt 物件檔案的事件
    class SaveListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            JLabel t1 = (JLabel) GUIComponent.get(2);
            JTextField t2 = (JTextField) GUIComponent.get(4);
            
            try {
                FileOutputStream fs = new FileOutputStream("encryptor.ser");
                ObjectOutputStream os = new ObjectOutputStream(fs);
                os.writeObject(e);
                os.close();
                fs.close();
                t1.setText("This is Save button. Encrypt object is saved.");
            }
            catch (Exception ex) {
                ex.printStackTrace();
                t1.setText("This is Save button. Encrypt object is not saved.");
            }
            finally {
                t2.setText("after Save .....");
            }
        }
    }
    
    // 進行編碼的事件
    class EncodeListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            JLabel t1 = (JLabel) GUIComponent.get(2);
            JTextField t2 = (JTextField) GUIComponent.get(4);
            
            if (userinput == "") {
                t1.setText("This is Encode button. No input string!!");
            }
            else {
                if (e == null) {
                    t1.setText("This is Encode button. No Encrypt object!!");
                }
                else {
                    result = e.toEncode(userinput);
                
                    t2.setText(result);
                    t1.setText("This is Encode button. The result is above.");
                }
            }
        }
    }
    
    // 進行解碼的事件
    class DecodeListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            JLabel t1 = (JLabel) GUIComponent.get(2);
            JTextField t2 = (JTextField) GUIComponent.get(4);
            
            if (userinput == "") {
                t1.setText("This is Decode button. No input string!!");
            }
            else {
                if (e == null) {
                    t1.setText("This is Decode button. No Encrypt object!!");
                }
                else {
                    result = e.toDecode(userinput);
            
                    t2.setText(result);
                    t1.setText("This is Decode button. The result is above.");
                }
            }
        }
    }
    
    // 清楚文字方塊及暫存資料的事件
    class ClearListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            userinput = "";
            result = "";
            
            JTextField t2 = (JTextField) GUIComponent.get(3);
            t2.setText("");
            JTextField t3 = (JTextField) GUIComponent.get(4);
            t3.setText("");
            
            JLabel t1 = (JLabel) GUIComponent.get(2);
            t1.setText("This is Clear button. Your input is clear.");
        }
    }
    
    // 將輸出結果拷貝到作業系統的剪貼簿
    class CopyListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            JTextField t2 = (JTextField) GUIComponent.get(4);
            t2.selectAll();
            t2.copy();
            
            JLabel t1 = (JLabel) GUIComponent.get(2);
            t1.setText("This is Copy button. Result is copied to clipboard.");
        }
    }
}

/* 《程式語言教學誌》的範例程式
    http://pydoing.blogspot.com/
    檔名:EncryptorGUI.java
    功能:示範 Java 程式 
    作者:張凱慶
    時間:西元 2011 年 4 月 */


您可以繼續參考
範例程式碼


相關目錄
回 Java 入門指南
回 Java 教材目錄
回首頁


參考資料
The JavaTM Tutorials: Getting Started
The JavaTM Tutorials: Learning the Java Language
The JavaTM Tutorials: Essential Classes
The Java Language Specification, Third Edition


本文於 2013 年 1 月訂正

沒有留言: