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Jbuilder下写的记事本,希望对你有帮助
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class Jishiben extends JFrame implements ActionListener{
private ObjectOutputStream output;
private ObjectInputStream input;
private String fileBody="";
boolean isCreate = false;
boolean isOpen = false;
boolean openFileSeccess = false;
boolean createFileSeccess = false;
private JMenuBar menubar;
private JMenu wenjian;
private JMenu bianji;
private JMenu bangzhu;
private JMenuItem xinjian;
private JMenuItem dakai;
private JMenuItem baocun;
private JMenuItem tuichu;
private JMenuItem fuzhi;
private JMenuItem zhantie;
private JMenuItem jianqie;
private JMenuItem chazhao;
private JMenuItem quanxuan;
private JMenuItem riqi;
private JMenuItem guanyu;
private JMenuItem help;
private JTextArea area;
private JPanel mainPanel;
private JPanel areaPanel;
public Jishiben() {
super("-记事本");
menubar = new JMenuBar();
menubar.add(wenjian = new JMenu("文件(F)"));
menubar.add(bianji = new JMenu ("编辑(E)"));
menubar.add(bangzhu = new JMenu("帮助(H)"));
wenjian.add(xinjian = new JMenuItem("新建(N)"));
wenjian.add(dakai = new JMenuItem("打开(O)"));
wenjian.add(baocun = new JMenuItem("保存(S)"));
wenjian.add(tuichu = new JMenuItem("退出(X)"));
bianji.add(fuzhi = new JMenuItem("复制"));
bianji.add(jianqie = new JMenuItem("剪切"));
bianji.add(zhantie = new JMenuItem("粘贴"));
bianji.add(chazhao = new JMenuItem("查找"));
bianji.add(quanxuan = new JMenuItem("全选"));
bianji.add(riqi = new JMenuItem("日期"));
bangzhu.add(guanyu = new JMenuItem("关于"));
bangzhu.add(help = new JMenuItem("帮助"));
wenjian.setFont(new Font("Dialog",0,12));
bianji.setFont(new Font("Dialog",0,12));
bangzhu.setFont(new Font("Dialog",0,12));
xinjian.setFont(new Font("Dialog",0,12));
dakai.setFont(new Font("Dialog",0,12));
baocun.setFont(new Font("Dialog",0,12));
tuichu.setFont(new Font("Dialog",0,12));
fuzhi.setFont(new Font("Dialog",0,12));
jianqie.setFont(new Font("Dialog",0,12));
zhantie.setFont(new Font("Dialog",0,12));
chazhao.setFont(new Font("Dialog",0,12));
quanxuan.setFont(new Font("Dialog",0,12));
riqi.setFont(new Font("Dialog",0,12));
guanyu.setFont(new Font("Dialog",0,12));
help.setFont(new Font("Dialog",0,12));
wenjian.setMnemonic(′f′);
dakai.setMnemonic(′o′);
bianji.setMnemonic(′e′);
bangzhu.setMnemonic(′h′);
xinjian.setMnemonic(′n′);
baocun.setMnemonic(′s′);
tuichu.setMnemonic(′x′);
xinjian.addActionListener(this);
dakai.addActionListener(this);
baocun.addActionListener(this);
tuichu.addActionListener(this);
fuzhi.addActionListener(this);
zhantie.addActionListener(this);
chazhao.addActionListener(this);
quanxuan.addActionListener(this);
riqi.addActionListener(this);
guanyu.addActionListener(this);
help.addActionListener(this);
area = new JTextArea();
Container container = getContentPane();
mainPanel = new JPanel();
JScrollPane areaPanel=new JScrollPane(area);
area.setLineWrap(true);
areaPanel.setWheelScrollingEnabled(true);
mainPanel.setLayout(new BorderLayout());
container.add("Center",mainPanel);
mainPanel.add("North",menubar);
mainPanel.add("Center",areaPanel);
setSize(800,600);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = getSize();
if (frameSize.height > screenSize.height) {
frameSize.height = screenSize.height;
}
if (frameSize.width > screenSize.width) {
frameSize.width = screenSize.width;
}
setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
setVisible(true);
show();
} public void actionPerformed( ActionEvent e) {
if(e.getSource()==xinjian)
xinjian();
if(e.getSource()==dakai)
dakai();
if(e.getSource()==baocun)
baocun();
if(e.getSource()==tuichu)
tuichu();
if(e.getSource()==guanyu)
guanyu();
if(e.getSource()==help)
help();
if(e.getSource()==fuzhi)
area.copy();
if(e.getSource()==jianqie)
area.cut();
if(e.getSource()==zhantie)
area.paste();
}
private void xinjian()
{
createFile();
if(createFileSeccess == true)
isCreate = true;
}
private void dakai() {
openFile();
if(openFileSeccess == true)
{
isOpen = true;
try{
fileBody = (String)input.readObject();
area.setText(fileBody);
} catch(ClassNotFoundException cnfex)
{
JOptionPane.showMessageDialog(this,"Unable to create object","Class not Found",
JOptionPane.ERROR_MESSAGE);
}
catch(IOException io)
{
JOptionPane.showMessageDialog(this,"Error during read from file","Read Error",
JOptionPane.ERROR_MESSAGE);
}
}
}
private void baocun()/
{ if(isCreate==true)
{
try{
fileBody = area.getText(); //
output.writeObject(fileBody); //
output.flush();
isCreate=false;
isOpen = false; //
} catch(IOException io) //
{
closeFile(); //
}
}
if(isOpen==true)
{
createFile();
if(createFileSeccess==true)
{
try{
fileBody = area.getText(); //
output.writeObject(fileBody); //
output.flush();
} catch(IOException io) //
{
closeFile(); //
}
}
}
if(isCreate!=true&&isOpen!=true)
{
createFile();
if(createFileSeccess==true)
{
isCreate = true; //
try{
fileBody = area.getText();
output.writeObject(fileBody); //
output.flush();
}
//
catch(IOException io)
{
closeFile();
}
}//end if
}
}
private void tuichu() {
System.exit(0);
}
private void closeFile()
{
try{
output.close();
System.exit(0);
}
catch(IOException ex){
JOptionPane.showMessageDialog(this,
"Error closing file",
"Error",JOptionPane.ERROR_MESSAGE);
System.exit(1);
}
} private void openFile()
{
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(
JFileChooser.FILES_ONLY );
int result = fileChooser.showOpenDialog( this );
if ( result == JFileChooser.CANCEL_OPTION )
return;
File fileName = fileChooser.getSelectedFile();
if ( fileName == null ||
fileName.getName().equals( "" ) )
JOptionPane.showMessageDialog( this,
"Invalid File Name",
"Invalid File Name",
JOptionPane.ERROR_MESSAGE );
else {
// Open the file
try {
input = new ObjectInputStream(
new FileInputStream( fileName ) );
openFileSeccess = true;////
dakai.setEnabled( true );
}
catch ( IOException e ) {
JOptionPane.showMessageDialog( this,
"Error Opening File", "Error",
JOptionPane.ERROR_MESSAGE );
}
}
}
////////
//create a file
private void createFile()
{
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(
JFileChooser.FILES_ONLY );
int result = fileChooser.showSaveDialog( this );
// clicked Cancel button on dialog
if ( result == JFileChooser.CANCEL_OPTION )
return;
File fileName = fileChooser.getSelectedFile();
if ( fileName == null ||
fileName.getName().equals( "" ) )
JOptionPane.showMessageDialog( this,
"Invalid File Name",
"Invalid File Name",
JOptionPane.ERROR_MESSAGE );
else {
// Open the file
try {
output = new ObjectOutputStream(
new FileOutputStream( fileName ) );
createFileSeccess = true;
xinjian.setEnabled( true );
}
catch ( IOException e ) {
JOptionPane.showMessageDialog( this,
"Error Opening File", "Error",
JOptionPane.ERROR_MESSAGE );
}
}
}
private void guanyu()
{
JOptionPane.showMessageDialog(this," java版记事本 "+ "\n" +
" By yellow ","关于记事本",2);
}
private void help()
{
JOptionPane.showMessageDialog(this,"复制(Ctrl+c)，粘贴(Ctrl+v), 剪切(Ctrl+x) ",
"help",2);
}
public static void main(String args[])
{
Jishiben app = new Jishiben();
app.addWindowListener(
new WindowAdapter(){
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
);
}
}
FileDialog(this,"Name",FileDialog.SAVE)
问题以解决
FileChooser fc=new FileChooser();
fc.showSaveDialog();
谢谢laughsmile(海边的星空) 、 hjzhank(译名)

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