编记事本过程遇到的问题
刚学java，试编了下记事本，出了很多问题，麻烦前辈们眼力好的花点时间看下，很奇怪为什么stateBar有没有显示在下面，然后事件的监听很不正常，键盘的快捷键也实现不了，望大神可以多提一些建议，不怕挨批只求进步！！import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import
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import java.util.Enumeration;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.plaf.FontUIResource;
public class Ex227 extends JFrame{
private JMenuBar cd;
private JMenu cd1,cd2,cd3,cd4,cd5;
private JMenuItem cd11,cd12,cd13,cd14,cd15,cd16,cd17;
private JMenuItem cd21,cd22,cd23,cd24,cd25,cd26,cd27,cd28,cd29,cd210,cd211;
private JMenuItem cd31,cd32;
private JMenuItem cd41;
private JMenuItem cd51,cd52;
private JTextArea wby;
private JScrollPane gdt;
private JLabel stateBar;
private JPopupMenu popUpMenu;
private JFileChooser fileChooser;
public Ex227() {
super("新建文本文档");
setUpUIComponent();
setUpEventListener();
ImageIcon image=new ImageIcon("u=2739352216,4239401708&fm=23&gp=0.jpg");
this.setIconImage(image.getImage());
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private void setUpUIComponent(){
this.setSize(500,500);
//菜单栏
cd=new JMenuBar();
// 设置「文件」菜单
cd1=new JMenu("文件(F)");
cd11=new JMenuItem("新建(N) Ctrl+N");
cd12=new JMenuItem("打开(O)... Ctrl+O");
cd12.setAccelerator(
KeyStroke.getKeyStroke(
KeyEvent.VK_O,
InputEvent.CTRL_MASK));
cd13=new JMenuItem("保存(S) Ctrl+S");
cd13.setAccelerator(
KeyStroke.getKeyStroke(
KeyEvent.VK_S,
InputEvent.CTRL_MASK));
cd14=new JMenuItem("另存为(A)...");
cd15=new JMenuItem("页面设置(U)");
cd16=new JMenuItem("打印(P) Ctrl+P");
cd17=new JMenuItem("退出(X)");
cd17.setAccelerator(
KeyStroke.getKeyStroke(
'X'));
cd1.add(cd11);
cd1.add(cd12);
cd1.add(cd13);
cd1.add(cd14);
cd1.addSeparator();
cd1.add(cd15);
cd1.add(cd16);
cd1.addSeparator();
cd1.add(cd17);
// 设置「编辑」菜单
cd2=new JMenu("编辑(E)");
cd21=new JMenuItem("撤销(Z) Ctrl+Z");
cd22=new JMenuItem("剪切(T) Ctrl+X");
cd22.setAccelerator(
KeyStroke.getKeyStroke(KeyEvent.VK_X,
InputEvent.CTRL_MASK));
cd23=new JMenuItem("复制(C) Ctrl+C");
cd23.setAccelerator(
KeyStroke.getKeyStroke(KeyEvent.VK_C,
InputEvent.CTRL_MASK));
cd24=new JMenuItem("粘贴(V) Ctrl+V");
cd24.setAccelerator(
KeyStroke.getKeyStroke(KeyEvent.VK_V,
InputEvent.CTRL_MASK));
cd25=new JMenuItem("删除(L) Del");
cd26=new JMenuItem("查找(F)...");
cd27=new JMenuItem("查找下一个(N) F3");
cd28=new JMenuItem("替换(R) Ctrl+H");
cd29=new JMenuItem("转到(G) Ctrl+G");
cd210=new JMenuItem("全选(A) Ctrl+A");
cd211=new JMenuItem("时间/日期(D) F5");
cd2.add(cd21);
cd2.addSeparator();
cd2.add(cd22);
cd2.add(cd23);
cd2.add(cd24);
cd2.add(cd25);
cd2.addSeparator();
cd2.add(cd26);
cd2.add(cd27);
cd2.add(cd28);
cd2.add(cd29);
cd2.add(cd210);
cd2.addSeparator();
cd2.add(cd211);
//设置[格式]菜单
cd3=new JMenu("格式(0)");
cd31=new JMenuItem("自动换行(W) ");
cd32=new JMenuItem("字体(F) ");
cd3.add(cd31);
cd3.add(cd32);
//设置[查看]菜单
cd4=new JMenu("查看(V)");
cd41=new JMenuItem("状态栏(S) ");
cd4.add(cd41);
//设置[帮助]菜单
cd5=new JMenu("帮助(H)");
cd51=new JMenuItem("查看帮助(H) ");
cd52=new JMenuItem("关于笔记本(A) ");
cd5.add(cd51);
cd5.addSeparator();
cd5.add(cd52);
cd.add(cd1);
cd1.setMnemonic('F');
cd.add(cd2);
cd2.setMnemonic('E');
cd.add(cd3);
cd3.setMnemonic('O');
cd.add(cd4);
cd4.setMnemonic('V');
cd.add(cd5);
cd5.setMnemonic('H');
this.setJMenuBar(cd);
//设置文本域
wby=new JTextArea();
wby.setFont(new Font("宋体", Font.PLAIN, 16));
wby.setLineWrap(true);//设置文本区的换行策略。
JScrollPane panel = new JScrollPane(wby,
ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
Container contentPane = getContentPane();
contentPane.add(panel, BorderLayout.CENTER);
// 状态栏
stateBar = new JLabel("未修改");
stateBar.setHorizontalAlignment(SwingConstants.LEFT); //设置标签内容沿 X 轴的对齐方式。
stateBar.setBorder(BorderFactory.createEtchedBorder());
contentPane.add(stateBar, BorderLayout.SOUTH);
popUpMenu = cd2.getPopupMenu();
fileChooser = new JFileChooser();
}
private void setUpEventListener(){
// 按下窗口关闭钮事件处理
this.addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
closeFile();
}
}
);
// 菜单 - 打开
cd12.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
openFile();
}
}
);
// 菜单 - 保存
cd13.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
saveFile();
}
}
);
// 菜单 - 另存为
cd14.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
saveFileAs();
}
}
);
// 菜单 - 关闭文件
cd17.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
closeFile();
}
}
);
// 菜单 - 剪切
cd22.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
cut();
}
}
);
// 菜单 - 复制
cd23.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
copy();
}
}
);
// 菜单 - 粘贴
cd24.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
paste();
}
}
);
// 编辑区键盘事件
wby.addKeyListener(
new KeyAdapter() {
public void keyTyped(KeyEvent e) {
processTextArea();
}
}
);
// 编辑区鼠标事件
wby.addMouseListener(
new MouseAdapter() {
public void mouseReleased(MouseEvent e) {
if(e.getButton() == MouseEvent.BUTTON3)
popUpMenu.show(cd2, e.getX(), e.getY());
}
public void mouseClicked(MouseEvent e) {
if(e.getButton() == MouseEvent.BUTTON1)
popUpMenu.setVisible(false);
}
}
);
}
private void openFile() {
if(isCurrentFileSaved()) { // 文件是否为保存状态
open(); // 打开
}
else {
// 显示对话框
int option = JOptionPane.showConfirmDialog(
null, "文件已修改，是否保存？",
"保存文件？", JOptionPane.YES_NO_OPTION,
JOptionPane.WARNING_MESSAGE, null);
switch(option) {
// 确认文件保存
case JOptionPane.YES_OPTION:
saveFile(); // 保存文件
break;
// 放弃文件保存
case JOptionPane.NO_OPTION:
open();
break;
}
}
}
private boolean isCurrentFileSaved() {
if(stateBar.getText().equals("未修改")) {
return false;
}
else {
return true;
}
}
private void open() {
// fileChooser 是 JFileChooser 的实例
// 显示文件选取的对话框
int option = fileChooser.showOpenDialog(null);
// 使用者按下确认键
if(option == JFileChooser.APPROVE_OPTION) {
try {
// 开启选取的文件
BufferedReader buf =
new BufferedReader(
new FileReader(
fileChooser.getSelectedFile()));
// 设定文件标题
setTitle(fileChooser.getSelectedFile().toString());
// 清除前一次文件
wby.setText("");
// 设定状态栏
stateBar.setText("未修改");
// 取得系统相依的换行字符
String lineSeparator = System.getProperty("line.separator");
// 读取文件并附加至文字编辑区
String text;
while((text = buf.readLine()) != null) {
wby.append(text);
wby.append(lineSeparator);
}
buf.close();
}
catch(IOException e) {
JOptionPane.showMessageDialog(null, e.toString(),
"开启文件失败", JOptionPane.ERROR_MESSAGE);
}
}
}
private void saveFile() {
// 从标题栏取得文件名称
File file = new File(getTitle());
// 若指定的文件不存在
if(!file.exists()) {
// 执行另存为
saveFileAs();
}
else {
try {
// 开启指定的文件
BufferedWriter buf =
new BufferedWriter(
new FileWriter(file));
// 将文字编辑区的文字写入文件
buf.write(wby.getText());
buf.close();
// 设定状态栏为未修改
stateBar.setText("未修改");
}
catch(IOException e) {
JOptionPane.showMessageDialog(null, e.toString(),
"写入文件失败", JOptionPane.ERROR_MESSAGE);
}
}
}
private void saveFileAs(){
//显示文件选择器
int option=fileChooser.showSaveDialog(null);
//取得选择文件
if(option==fileChooser.APPROVE_OPTION){
//取得所得文件
File file=fileChooser.getSelectedFile();
//设置文件标题
this.setTitle(file.toString());
try{
//建立新文件
file.createNewFile();
//保存文件
saveFile();
}
catch(IOException e){
JOptionPane.showMessageDialog(null, e.toString(),
"无法建立新文件", JOptionPane.ERROR_MESSAGE);
}
}
}
private void closeFile() {
// 是否已保存文件
if(isCurrentFileSaved()) {
// 释放窗口资源，而后关闭程序
dispose();
}
else {
int option = JOptionPane.showConfirmDialog(
null, "文件已修改，是否保存？",
"保存文件？", JOptionPane.YES_NO_OPTION,
JOptionPane.WARNING_MESSAGE, null);
switch(option) {
case JOptionPane.YES_OPTION:
saveFile();
break;
case JOptionPane.NO_OPTION:
dispose();
}
}
}
private void cut(){
wby.cut();
stateBar.setText("已修改");
popUpMenu.setVisible(false);
}
private void copy(){
wby.copy();
popUpMenu.setVisible(false);
}
private void paste(){
wby.paste();
stateBar.setText("已修改");
popUpMenu.setVisible(false);
}
private void processTextArea(){
stateBar.setText("已修改");
}
private static void InitGlobalFont(Font font) {
FontUIResource fontRes = new FontUIResource(font);
for (Enumeration<Object> keys = UIManager.getDefaults().keys();
keys.hasMoreElements(); ) {
Object key = keys.nextElement();
Object value = UIManager.get(key);
if (value instanceof FontUIResource) {
UIManager.put(key, fontRes);
}
}
}
public static void main(String[] args){
InitGlobalFont(new Font("alias", Font.PLAIN, 13));
new Note();
}
}
