Java实现简易记事本
本程序是模仿Windows自带的记事本，实现了文本文件的打开，保存，新建，编辑，复制，剪切等基本功能。原理比较简单。主要用到了awt包和swing包下的工具类来完成界面的编写和io包中的工具类来进行文件的读写操作。
主要用到的工具类：
JTextPane：用于创建文本窗格，编辑窗口对象
JLabel：用于创建状态栏对象
JFileChooser：用于创建文件选择器对象
JToolBar：用于实例化工具条。
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算了，太多了，代码里都加了注释，话不多说，直接上代码吧
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;
public class EditorDemo extends JFrame{
JTextPane textPane = new JTextPane();//文本窗格，编辑窗口
JLabel statusBar = new JLabel();//状态栏
JFileChooser fileChooser = new JFileChooser();//文件选择器
/**
* 构造函数
* 用于设置编辑器的主体布局
* */
public EditorDemo() {
// TODO Auto-generated constructor stub
super("简单的记事本");
Action[] actions = {
new NewAction(),new OpenAction(),new SaveAction(),
new CutAction(),new CopyAction(),new PasteAction(),
new AboutAction(),new ExitAction()
};
setJMenuBar(createJMenuBar(actions));//设置菜单栏
Container container = getContentPane();//获取容器
container.add(createJToolBar(actions),BorderLayout.NORTH);//增加工具栏
container.add(textPane,BorderLayout.CENTER);//增加文本窗格
container.add(statusBar,BorderLayout.SOUTH);//增加状态栏
setSize(660, 400);//设置窗口尺寸
setLocation(300, 200);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭窗口时退出程序
}
/**
* 创建工具条
*
* */
private Component createJToolBar(Action[] actions) {
// TODO Auto-generated method stub
JToolBar toolBar = new JToolBar();//实例化工具条
/**
* 实例化新的按钮
* 设置不需要的焦点
* 添加按钮到工具栏
* */
for(int i = 0; i< actions.length; i++) {
JButton bt = new JButton(actions[i]);
bt.setRequestFocusEnabled(false);
toolBar.add(bt);
}
return toolBar;//返回工具栏
}
/**
* 创建菜单栏
*
* */
private JMenuBar createJMenuBar(Action[] actions) {
// TODO Auto-generated method stub
JMenuBar menuBar = new JMenuBar();//实例化菜单栏
JMenu menuFile = new JMenu("文件");
JMenu menuEdit = new JMenu("编辑");
JMenu menuAbout = new JMenu("帮助");
menuFile.add(new JMenuItem(actions[0]));//添加新的菜单项
menuFile.add(new JMenuItem(actions[1]));
menuFile.add(new JMenuItem(actions[2]));
menuFile.add(new JMenuItem(actions[7]));
menuEdit.add(new JMenuItem(actions[3]));
menuEdit.add(new JMenuItem(actions[4]));
menuEdit.add(new JMenuItem(actions[5]));
menuAbout.add(new JMenuItem(actions[6]));
menuBar.add(menuFile);
menuBar.add(menuEdit);
menuBar.add(menuAbout);
return menuBar;//返回菜单栏
}
class NewAction extends AbstractAction{
public NewAction() {
// TODO Auto-generated constructor stub
super("新建");
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
textPane.setDocument(new DefaultStyledDocument());//清空菜单栏
}
}
class OpenAction extends AbstractAction{
public OpenAction() {
// TODO Auto-generated constructor stub
super("打开");
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
int i = fileChooser.showOpenDialog(EditorDemo.this);//显示打开文件对话框
/**
* 单击对话框打开选项
* 得到选择的文件
* 得到文件输入流
* 读入文件到文本窗格
* 捕获异常，输出错误信息
*
* */
if(i == JFileChooser.APPROVE_OPTION) {
File f = fileChooser.getSelectedFile();
try {
InputStream is = new FileInputStream(f);
textPane.read(is,"d");
}
catch(Exception e) {
e.printStackTrace();
}
}
}
}
class SaveAction extends AbstractAction{
public SaveAction() {
// TODO Auto-generated constructor stub
super("保存");
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
/**
* 显示保存文件对话框
* 单击对话框中的保存按钮
* 得到文件输出流
* 写出文件
* 捕获异常
*
* */
int i = fileChooser.showSaveDialog(EditorDemo.this);
if(i == JFileChooser.APPROVE_OPTION) {
File f = fileChooser.getSelectedFile();
try {
FileOutputStream out = new FileOutputStream(f);
out.write(textPane.getText().getBytes());
}
catch(Exception e) {
e.printStackTrace();
}
}
}
}
class ExitAction extends AbstractAction{
public ExitAction() {
// TODO Auto-generated constructor stub
super("退出");
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
System.exit(0);
}
}
class CutAction extends AbstractAction{
public CutAction() {
// TODO Auto-generated constructor stub
super("剪切");
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
textPane.cut();
}
}
class CopyAction extends AbstractAction{
public CopyAction() {
// TODO Auto-generated constructor stub
super("复制");
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
textPane.copy();
}
}
class PasteAction extends AbstractAction{
public PasteAction() {
// TODO Auto-generated constructor stub
super("粘贴");
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
textPane.paste();
}
}
class AboutAction extends AbstractAction{
public AboutAction() {
// TODO Auto-generated constructor stub
super("关于");
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
JOptionPane.showMessageDialog(EditorDemo.this,"作者：小风0010\n学号： 0010");
}
}
public static void main(String[] args) {
new EditorDemo();
}
}
