📄 notebook.java
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import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.awt.*;
public class NoteBook extends JFrame implements ActionListener
{
public JTextArea textArea;
private JScrollPane scrollBar;
private JMenuBar menuBar;
private JMenu menu;
private JMenuItem menuItem;
private File file=new File("1.txt");
private JFileChooser fileChooser=new JFileChooser();
private String fileName=null;
private boolean isChanged=false;
private MyFontChooser fontChooser=new MyFontChooser();
private Timer myTimer;
NoteBook()
{
super("NoteBook");
setBounds(250,200,550,400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
textArea=new JTextArea();
textArea.setLineWrap(true);//允许自动换行
scrollBar=new JScrollPane(textArea);
getContentPane().add(scrollBar);
scrollBar.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
menuBar=new JMenuBar();
setJMenuBar(menuBar); //将菜单条放在窗口顶端
menu=new JMenu("文件");
menuBar.add(menu); //将文件菜单放进菜单条
menuItem=new JMenuItem("新建");
menuItem.addActionListener(this);
menuItem.setActionCommand("new");
menu.add(menuItem); //将子菜单放进文件父菜
menuItem=new JMenuItem("打开");
menuItem.addActionListener(this);
menuItem.setActionCommand("open");
menu.add(menuItem);
menuItem=new JMenuItem("保存");
menuItem.addActionListener(this);
menuItem.setActionCommand("save");
menu.add(menuItem);
menu.addSeparator();
menuItem=new JMenuItem("退出");
menuItem.addActionListener(this);
menuItem.setActionCommand("exit");
menu.add(menuItem);
menu=new JMenu("编辑");
menuBar.add(menu);
menuItem=new JMenuItem("剪切");
menuItem.addActionListener(this);
menuItem.setActionCommand("cut");
menu.add(menuItem);
menuItem=new JMenuItem("复制");
menuItem.addActionListener(this);
menuItem.setActionCommand("copy");
menu.add(menuItem);
menuItem=new JMenuItem("粘贴");
menuItem.addActionListener(this);
menuItem.setActionCommand("stick");
menu.add(menuItem);
menuItem=new JMenuItem("全选");
menuItem.addActionListener(this);
menuItem.setActionCommand("selectall");
menu.add(menuItem);
menu.addSeparator();
menuItem=new JMenuItem("清除");
menu.add(menuItem);
menuItem.addActionListener(this);
menuItem.setActionCommand("clear");
menu=new JMenu("设置");
menuBar.add(menu);
menuItem=new JMenuItem("字体颜色");
menuItem.addActionListener(this);
menuItem.setActionCommand("fontColor");
menu.add(menuItem);
menuItem=new JMenuItem("字体样式");
menuItem.addActionListener(this);
menuItem.setActionCommand("fontStyle");
menu.add(menuItem);
menu=new JMenu("帮助");
menuBar.add(menu);
menuItem=new JMenuItem("关于");
menuItem.addActionListener(this);
menuItem.setActionCommand("about");
menu.add(menuItem);
menu.addActionListener(this);
textArea.addKeyListener(new KeyListener(){
public void keyTyped(KeyEvent e){}
public void keyPressed(KeyEvent e){isChanged=true;}
public void keyReleased(KeyEvent e){}
});
myTimer=new Timer(500,new ActionListener(){
public void actionPerformed(ActionEvent ev){
String str=fontChooser.getStrFont();
int st=fontChooser.getFontStyle();
int si=fontChooser.getFontSize();
textArea.setFont(new Font(str,st,si));
}
});
myTimer.start();
setTitle("NoteBook -"+file.getName());
setVisible(true);
}
//=======================================================================
public void openFile()
{
int flag=fileChooser.showOpenDialog(this);
if(flag!=fileChooser.CANCEL_OPTION)
{
file=fileChooser.getSelectedFile().getAbsoluteFile();
try{
FileReader getFile=new FileReader(file);
int len=(int)file.length();
char[] buffer=new char[len];
getFile.read(buffer,0,len);
getFile.close();
textArea.setText(new String(buffer));
}
catch(IOException ex){}
setTitle("NoteBook -"+file.getName());
}
}
//=======================================================================
public void saveFile()
{
if(file.exists())
{
try
{
FileWriter putFile=new FileWriter(file);
putFile.write(textArea.getText());
putFile.close();
}
catch(IOException ex){}
}
else
{
int flag=fileChooser.showSaveDialog(this);
if(flag!=fileChooser.CANCEL_OPTION)
{
fileName=fileChooser.getSelectedFile().getAbsolutePath();
if(fileName.endsWith(".txt"))
{
try{
FileWriter putFile=new FileWriter(fileName);
putFile.write(textArea.getText());
putFile.close();
}
catch(IOException ex){}
}
else if(fileName!="")
{
try{
FileWriter putFile=new FileWriter(fileName+".txt");
putFile.write(textArea.getText());
putFile.close();
}catch(IOException ex){}
}
}
}
}
//=======================================================================
public void actionPerformed(ActionEvent e)
{
String command=e.getActionCommand();
if(command=="new")
{
if(isChanged)
{
int flag=JOptionPane.showConfirmDialog(this,
"你已经改变了文本内容，是否保存？",
"请确认",
JOptionPane.YES_NO_CANCEL_OPTION);
if(flag==0)
saveFile();
else if(flag==1)
textArea.setText("");
}
else
{
file=new File("1.txt");
setTitle("NoteBook -1.txt");
textArea.setText("");
}
}
else if(command=="open")
{
openFile();
}
else if(command=="save")
{
saveFile();
isChanged=false;
}
else if(command=="exit")
{
System.exit(0);
}
//-------------------------------------------------
else if(command=="cut")
{
textArea.cut();
}
else if(command=="copy")
{
textArea.copy();
}
else if(command=="stick")
{
textArea.paste();
}
else if(command=="selectall")
{
textArea.selectAll();
}
else if(command=="clear")
{
textArea.setText("");
}
//********************************************************
else if(command=="fontColor")
{
JColorChooser colorChooser=new JColorChooser();
textArea.setForeground(colorChooser.showDialog(this,"字体颜色设置",Color.black));
}
else if(command=="fontStyle")
{
fontChooser.showWindow(true);
}
//********************************************************
else
{
JOptionPane.showMessageDialog(this,
"作者：※乱舞靑春※\n"+
"时间：2007-4-20\n"+
"QQ：287209159\n"+
"email: wu2yi2bing@163.com ",
"关于作者",
JOptionPane.OK_OPTION,
new ImageIcon("image\\icon.gif"));
}
}
}
//**************************************************************************
class MyFontChooser extends JFrame implements ActionListener
{
private int style;
private int size;
private String strFont;
private int tempStyle;
private int tempSize;
private String tempStrFont;
private JRadioButton radioBtnST;
private JRadioButton radioBtnYY;
private JRadioButton radioBtnKT;
private JRadioButton radioBtnHT;
private JRadioButton radioBtnLS;
private ButtonGroup group1;
private JRadioButton radioBtnBold;
private JRadioButton radioBtnItalic;
private JRadioButton radioBtnBI;
private JRadioButton radioBtnPlain;
private ButtonGroup group2;
private JComboBox comboBox;
private JButton btnOK;
private JButton btnCancle;
public MyFontChooser()
{
super("Font Setting");
setBounds(300,250,300,150);
style=Font.PLAIN;
size=15;
strFont="宋体";
tempStyle=Font.PLAIN;
tempSize=15;
tempStrFont="宋体";
group1=new ButtonGroup();
radioBtnST=new JRadioButton("宋体",true);
radioBtnST.setBackground(Color.cyan);
radioBtnST.addActionListener(this);
radioBtnYY=new JRadioButton("幼圆",false);
radioBtnYY.setBackground(Color.cyan);
radioBtnYY.addActionListener(this);
radioBtnKT=new JRadioButton("楷体",false);
radioBtnKT.setBackground(Color.cyan);
radioBtnKT.addActionListener(this);
radioBtnHT=new JRadioButton("黑体",false);
radioBtnHT.setBackground(Color.cyan);
radioBtnHT.addActionListener(this);
radioBtnLS=new JRadioButton("隶书",false);
radioBtnLS.setBackground(Color.cyan);
radioBtnLS.addActionListener(this);
group1.add(radioBtnST);
group1.add(radioBtnYY);
group1.add(radioBtnKT);
group1.add(radioBtnHT);
group1.add(radioBtnLS);
group2=new ButtonGroup();
radioBtnPlain=new JRadioButton("一般",true);
radioBtnPlain.setBackground(Color.pink);
radioBtnPlain.addActionListener(this);
radioBtnBold=new JRadioButton("粗体",false);
radioBtnBold.setBackground(Color.pink);
radioBtnBold.addActionListener(this);
radioBtnItalic=new JRadioButton("斜体",false);
radioBtnItalic.setBackground(Color.pink);
radioBtnItalic.addActionListener(this);
radioBtnBI=new JRadioButton("粗斜体",false);
radioBtnBI.setBackground(Color.pink);
radioBtnBI.addActionListener(this);
group2.add(radioBtnPlain);
group2.add(radioBtnBold);
group2.add(radioBtnItalic);
group2.add(radioBtnBI);
String[] strItem={"字体大小8","字体大小9","字体大小10","字体大小11",
"字体大小12","字体大小13","字体大小14","字体大小15"};
comboBox=new JComboBox(strItem);
comboBox.addActionListener(this);
comboBox.setSelectedIndex(1);
btnOK=new JButton("确定");
btnOK.addActionListener(this);
btnCancle=new JButton("取消");
btnCancle.addActionListener(this);
Container cp;
cp=getContentPane();
GridLayout layout=new GridLayout(3,4,5,5);
cp.setLayout(layout);
cp.add(radioBtnST);
cp.add(radioBtnYY);
cp.add(radioBtnKT);
cp.add(radioBtnHT);
cp.add(radioBtnLS);
cp.add(radioBtnPlain);
cp.add(radioBtnBold);
cp.add(radioBtnItalic);
cp.add(radioBtnBI);
cp.add(comboBox);
cp.add(btnOK);
cp.add(btnCancle);
}
public void showWindow(boolean b)
{
if(b)
setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==radioBtnST)
{
tempStrFont="宋体";
}
else if(e.getSource()==radioBtnYY)
{
tempStrFont="幼圆";
}
else if(e.getSource()==radioBtnKT)
{
tempStrFont="楷体";
}
else if(e.getSource()==radioBtnHT)
{
tempStrFont="黑体";
}
else if(e.getSource()==radioBtnLS)
{
tempStrFont="隶书";
}
else if(e.getSource()==radioBtnBold)
{
tempStyle=Font.BOLD;
}
else if(e.getSource()==radioBtnBI)
{
tempStyle=Font.BOLD+Font.ITALIC;
}
else if(e.getSource()==radioBtnItalic)
{
tempStyle=Font.ITALIC;
}
else if(e.getSource()==radioBtnPlain)
{
tempStyle=Font.PLAIN;
}
else if(e.getSource()==comboBox)
{
tempSize=15+comboBox.getSelectedIndex();
}
else if(e.getSource()==btnOK)
{
strFont=tempStrFont;
style=tempStyle;
size=tempSize;
}
else if(e.getSource()==btnCancle)
{
setVisible(false);
}
}
public int getFontStyle()
{
return style;
}
public int getFontSize()
{
return size;
}
public String getStrFont()
{
return strFont;
}
}
//**************************************************************************
class MyNote
{
public static void main(String args[])
{
NoteBook noteBook=new NoteBook();
}
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