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
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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
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