记事本的编程
如何用基础java编写一个程序实现记事本的打开、保存、新建、退出等最基础的记事本所具有的功能。希望能提供程序的源代码。 还有些功能没有完全实现，但打开和关闭文件，及基本的编辑功能已经实现了。请看一下
import java.awt.*;import java.awt.event.*;
import java.io.*;
public class NoteEdit extends Frame implements ActionListener
{
/*定义主界面，一个菜单，一个文本区*/
TextArea tArea;
MenuBar mbr;
String str,fileName;
byte byteBuf[]=new byte[10000];
FileDialog fileDlg;
NoteEdit()
{
super("记事本");
setSize(521,700);
setLocation(250,30);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{ System.exit(0); }
});
tArea=new TextArea();
add("Center",tArea);
tArea.setFont(new Font("隶书",Font.BOLD,16));
mbr=new MenuBar();
/*设置文件菜单项*/
Menu file=new Menu("文件");
MenuItem newFile=new MenuItem("新建");
MenuItem open=new MenuItem("打开");
MenuItem save=new MenuItem("保存");
MenuItem saveAs=new MenuItem("另存为");
MenuItem print=new MenuItem("打印");
MenuItem exit=new MenuItem("退出");
file.add(newFile);
file.add(open);
file.add(save);
file.add(saveAs);
file.addSeparator();
file.add(print);
file.addSeparator();
file.add(exit);
newFile.addActionListener(this);
open.addActionListener(this);
save.addActionListener(this);
saveAs.addActionListener(this);
exit.addActionListener(this);
mbr.add(file);
/*设置编辑菜单项*/
Menu edit=new Menu("编辑");
MenuItem cut=new MenuItem("剪切");
MenuItem copy=new MenuItem("复制");
MenuItem paste=new MenuItem("粘贴");
MenuItem delete=new MenuItem("删除");
edit.add(cut);
edit.add(copy);
edit.add(paste);
edit.add(delete);
cut.addActionListener(this);
copy.addActionListener(this);
paste.addActionListener(this);
delete.addActionListener(this);
mbr.add(edit);
/*设置格式菜单项*/
Menu model=new Menu("格式");
MenuItem font=new MenuItem("字体...");
model.add(font);
font.addActionListener(this);
mbr.add(model);
/*设置帮助菜单项*/
Menu help=new Menu("帮助");
MenuItem aboutHelp=new MenuItem("关于记事本");
help.add(aboutHelp);
aboutHelp.addActionListener(this);
mbr.add(help);
setMenuBar(mbr);
setVisible(true);
}
public static void main(String[] args)
{
new NoteEdit();
}
/*响应菜单顼事件*/
public void actionPerformed(ActionEvent e)
{
if(e.getActionCommand()=="退出")
System.exit(0);
if(e.getActionCommand()=="打开")
{
fileDlg=new FileDialog(this,"打开文件");
fileDlg.show();
fileName=fileDlg.getFile();
try{
FileInputStream in=new FileInputStream(fileName);
in.read(byteBuf);
in.close();
str=new String(byteBuf);
tArea.setText(str);
setTitle("记事本-"+fileName);
}catch(IOException ioe){}
}
if(e.getActionCommand()=="保存")
{
fileDlg=new FileDialog(this,"保存文件",FileDialog.SAVE);
fileDlg.show();
fileName=fileDlg.getFile();
str=tArea.getText();
byteBuf=str.getBytes();
try{
FileOutputStream out=new FileOutputStream(fileName);
out.write(byteBuf);
out.close();
}catch(IOException ioe){}
}
if(e.getActionCommand()=="另存为")
{
fileDlg=new FileDialog(this,"另存为",FileDialog.SAVE);
fileDlg.show();
fileName=fileDlg.getFile();
str=tArea.getText();
byteBuf=str.getBytes();
try{
FileOutputStream out=new FileOutputStream(fileName);
out.write(byteBuf);
out.close();
}catch(IOException ioe){}
}
}
}
本程序只完成了文件菜单下设置（新建末实现），其它菜单项只是一个界面而已，希望各位继续完善。
回复 2# 的帖子
你的源代码好象有问题呀,运行的时候说找不到类FRAME1.但是你的类FRAME1也写了呀,不知道是什么原因.请高手完善一下.基本功能都有了，你自己去看看!
你自己去运行的看看,我是可以的 ! 不知道楼上几位是怎么搞的，安装java之后在demo目录下就有[[italic] 本帖最后由 longrm 于 2007-12-26 14:11 编辑 [/italic]] 我也给你一个记事本代码，供你参考（有点简单，不要笑[em09] ）：
/*!Begin Snippet:file*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
/**
* Demonstrates the class {@link JFileChooser}. This class extends
* class {@link @JPanel}.
*
* @author author name
* @version 1.0.0
*/
public class TextEditor extends JPanel {
/* Line separator */
private final static String NEW_LINE =
System.getProperty("line.separator");
/* Standard error stream */
private static PrintWriter stdErr =
new PrintWriter(System.err, true);
private JButton openButton;
private JButton saveButton;
private TextArea textArea;
private JFileChooser fileChooser;
/**
* Creates a window.
*
* @param args not used.
*/
public static void main(String[] args) {
JFrame frame = new JFrame("TextEditor");
frame.setContentPane(new TextEditor());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400,400);
frame.setVisible(true);
}
/**
* Creates a Graphical User Interface.
*/
public TextEditor() {
setBackground(Color.white);
// Create the components
openButton = new JButton("Open");
saveButton = new JButton("Save");
openButton.setFont(new Font("Serif", Font.BOLD, 30));
saveButton.setFont(new Font("Serif", Font.BOLD, 30));
textArea = new TextArea();
fileChooser = new JFileChooser();
//fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
// Register the listeners for the buttons
openButton.addActionListener(new OpenButtonListener());
saveButton.addActionListener(new SaveButtonListener());
// Add components to the container
setLayout(new BorderLayout());
add(openButton, BorderLayout.NORTH);
add(textArea, BorderLayout.CENTER);
add(saveButton, BorderLayout.SOUTH);
}
/**
* This inner class handles button clicks for the Open button.
*/
class OpenButtonListener implements ActionListener {
/**
* Opens a text file.
*
* @param event the event object.
*/
public void actionPerformed(ActionEvent event) {
int result = fileChooser.showOpenDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {
try {
File file = fileChooser.getSelectedFile();
BufferedReader input =
new BufferedReader(new FileReader(file));
String line = input.readLine();
while (line != null) {
textArea.append(line + NEW_LINE);
line = input.readLine();
}
input.close();
} catch (IOException ioe) {
stdErr.println(ioe.toString());
}
}
}
}
/**
* This inner class handles button clicks for the Save button.
*/
class SaveButtonListener implements ActionListener {
/**
* Saves a text file.
*
* @param event the event object.
*/
public void actionPerformed(ActionEvent event) {
int result = fileChooser.showSaveDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {
try {
File file = fileChooser.getSelectedFile();
PrintWriter output =
new PrintWriter(new FileWriter(file));
output.print(textArea.getText());
output.close();
} catch (IOException ioe) {
stdErr.println(ioe.toString());
}
}
}
}
}
/*!End Snippet:file*/ 5楼给提供的代码好像不太完善吧，比如说“新建”，你没有判断文本域是否为空就直接清空了，有待完善
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