//实例： 简单的文本编辑器
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JButton;
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.JTextPane;
import javax.swing.JToolBar;
import javax.swing.text.DefaultStyledDocument;
//简单的文本编辑器
public class t24 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
public t24() { //构造函数
super("简单的文本编辑器"); //调用父类构造函数
Action[] actions = //Action数组,各种操作命令
{
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(); //得到容器
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(340, 320); //设置窗口尺寸
setVisible(true); //设置窗口可视
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //关闭窗口时退出程序
}
private JMenuBar createJMenuBar(Action[] actions) { //创建菜单栏
JMenuBar menubar = new JMenuBar(); //实例化菜单栏
JMenu menuFile = new JMenu("文件"); //实例化菜单
JMenu menuEdit = new JMenu("编辑");
JMenu menuAbout = new JMenu("帮助");
menuFile.add(new JMenuItem(actions[0])); //增加新菜单项
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); //增加菜单
menubar.add(menuEdit);
menubar.add(menuAbout);
return menubar; //返回菜单栏
}
private JToolBar createJToolBar(Action[] actions) { //创建工具条
JToolBar toolBar = new JToolBar(); //实例化工具条
for (int i = 0; i < actions.length; i++) {
JButton bt = new JButton(actions[i]); //实例化新的按钮
bt.setRequestFocusEnabled(false); //设置不需要焦点
toolBar.add(bt); //增加按钮到工具栏
}
return toolBar; //返回工具栏
}
class NewAction extends AbstractAction { //新建文件命令
public NewAction() {
super("新建");
}
public void actionPerformed(ActionEvent e) {
textPane.setDocument(new DefaultStyledDocument()); //清空文档
}
}
class OpenAction extends AbstractAction { //打开文件命令
public OpenAction() {
super("打开");
}
public void actionPerformed(ActionEvent e) {
int i = filechooser.showOpenDialog(t24.this); //显示打开文件对话框
if (i == JFileChooser.APPROVE_OPTION) { //点击对话框中打开选项
File f = filechooser.getSelectedFile(); //得到选择的文件
try {
InputStream is = new FileInputStream(f); //得到文件输入流
textPane.read(is, "d"); //读入文件到文本窗格
} catch (Exception ex) {
ex.printStackTrace(); //输出出错信息
}
}
}
}
class SaveAction extends AbstractAction { //保存命令
public SaveAction() {
super("保存");
}
public void actionPerformed(ActionEvent e) {
int i = filechooser.showSaveDialog(t24.this); //显示保存文件对话框
if (i == JFileChooser.APPROVE_OPTION) { //点击对话框中保存按钮
File f = filechooser.getSelectedFile(); //得到选择的文件
try {
FileOutputStream out = new FileOutputStream(f); //得到文件输出流
out.write(textPane.getText().getBytes()); //写出文件
} catch (Exception ex) {
ex.printStackTrace(); //输出出错信息
}
}
}
}
class ExitAction extends AbstractAction { //退出命令
public ExitAction() {
super("退出");
}
public void actionPerformed(ActionEvent e) {
System.exit(0); //退出程序
}
}
class CutAction extends AbstractAction { //剪切命令
public CutAction() {
super("剪切");
}
public void actionPerformed(ActionEvent e) {
textPane.cut(); //调用文本窗格的剪切命令
}
}
class CopyAction extends AbstractAction { //拷贝命令
public CopyAction() {
super("拷贝");
}
public void actionPerformed(ActionEvent e) {
textPane.copy(); //调用文本窗格的拷贝命令
}
}
class PasteAction extends AbstractAction { //粘贴命令
public PasteAction() {
super("粘贴");
}
public void actionPerformed(ActionEvent e) {
textPane.paste(); //调用文本窗格的粘贴命令
}
}
class AboutAction extends AbstractAction { //关于选项命令
public AboutAction() {
super("关于");
}
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(t24.this, "简单的文本编辑器演示"); //显示软件信息
}
}
public static void main(String[] args) {
new t24();
}
} |
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