note.java

一个非常简单的记事本源码

//package net.src.net; 

import javax.swing.*; 
import javax.swing.event.*; 
import java.awt.*; 
import java.awt.event.*; 
import java.io.*; 
import java.awt.color.*; 
import java.awt.font.*; 
import javax.swing.undo.*; 

public class Note extends JFrame 
{ 
boolean isChange=false; 
boolean wasChange=false; 
JMenuBar menuBar=new JMenuBar(); 

JMenu menuFile=new JMenu("File"); 
JMenuItem menuFileOpen=new JMenuItem("Open.."); 
JMenuItem menuFileSave=new JMenuItem("Save.."); 
JMenuItem menuFileExit=new JMenuItem("Exit"); 

JMenu menuEdit=new JMenu("Edit"); 
JMenuItem menuFileCut=new JMenuItem("Cut"); 
JMenuItem font=new JMenuItem("Font"); 
JMenuItem menuFilePaste=new JMenuItem("Paste"); 

JTextArea fileArea=new JTextArea(); 

public Note() 
{ 
this.setTitle("记事本"); 
Toolkit tool=this.getToolkit();//窗口图标！ 
Image myimage=tool.getImage("戒指.jpg"); 
this.setIconImage(myimage); 
setDefaultCloseOperation(DO_NOTHING_ON_CLOSE); 
addWindowListener(new WindowAdapter() 
{ 
public void windowClosing(WindowEvent e) 
{ 
exit(); 
} 
}); 
menuFileOpen.addActionListener(new ActionListener() 
{ 
public void actionPerformed(ActionEvent e) 
{ 
fileOpen_actionPerformed(e); 
} 
}); 
menuFileSave.addActionListener(new ActionListener() 
{ 
public void actionPerformed(ActionEvent e) 
{ 
fileSave_actionPerformed(e); 
} 
}); 
menuFileExit.addActionListener(new ActionListener() 
{ 
public void actionPerformed(ActionEvent e) 
{ 
fileExit_actionPerformed(e); 
} 
}); 
menuFileCut.addActionListener(new ActionListener() 
{ 
public void actionPerformed(ActionEvent e) 
{ 
fileCut_actionPerformed(e); 
} 
}); 
menuFilePaste.addActionListener(new ActionListener() 
{ 
public void actionPerformed(ActionEvent e) 
{ 
filePaste_actionPerformed(e); 
} 
}); 
font.addActionListener(new ActionListener () 
{ 
public void actionPerformed(ActionEvent e) 
{ 
fileColor_actionPerformed(e); 
} 
}); 
fileArea.getDocument().addDocumentListener(new DocumentListener() 
{ 
public void insertUpdate(DocumentEvent e) 
{ 
wasChange=isChange; 
isChange=true; 
} 
public void removeUpdate(DocumentEvent e) 
{ 
wasChange=isChange; 
isChange=true; 
} 
public void changedUpdate(DocumentEvent e) 
{ 
wasChange=isChange; 
isChange=true; 
} 
}); 
setSize(500,450); 
menuBar.add(menuFile); 
menuFile.setMnemonic('F'); 
menuBar.add(menuEdit); 
menuEdit.setMnemonic('E'); 
menuFile.add(menuFileOpen); 
menuFileOpen.setMnemonic('O');//访问健; 
menuFileOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK));//快捷健; 
menuFile.add(menuFileSave); 
menuFileSave.setMnemonic('S'); 
menuFileSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK)); 
menuFile.addSeparator(); 
menuFile.add(menuFileExit); 
menuFileExit.setMnemonic('E'); 
menuEdit.add(menuFileCut); 
menuFileCut.setMnemonic('C'); 
menuFileCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK)); 
menuEdit.add(menuFilePaste); 
menuFilePaste.setMnemonic('P'); 
menuFilePaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P,InputEvent.CTRL_MASK)); 
menuEdit.add(font); 
font.setMnemonic('N'); 
font.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,InputEvent.CTRL_MASK)); 
this.getContentPane().add(new JScrollPane(fileArea)); 
setJMenuBar(menuBar); 
fileArea.setLineWrap(true); 
} 
public void fileExit_actionPerformed(ActionEvent e) 
{ 
System.exit(0); 
} 
public void fileOpen_actionPerformed(ActionEvent e) 
{ 
//以下是filter; 
JFileChooser fileChooser=new JFileChooser(); 
//fileChooser.addChoosableFileFilter(new myFilter("*.txt","Files(*.txt)")); 
fileChooser.addChoosableFileFilter(fileChooser.getFileFilter()); 
if(fileChooser.APPROVE_OPTION!=fileChooser.showOpenDialog(this))return; 
//以下是文件读 
BufferedReader dataIn=null; 
try 
{ 
dataIn=new BufferedReader(new FileReader(fileChooser.getSelectedFile().getPath())); 
String c=null; 
do 
{ 
c=dataIn.readLine(); 
if(c!=null) 
fileArea.append(c+"\n"); 
} 
while(c!=null); 
} 
catch(Exception ex) 
{ 
System.out.println("Catch exception:"+ex.toString()); 
} 
} 
public void exit() 
{ 
if(isChange==false) 
System.exit(1); 
else 
{ 
int decision=JOptionPane.showConfirmDialog(this,"The File has Change.\n"+"Do you want to save the change?", 
"Notepad",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.WARNING_MESSAGE); 
if (decision == JOptionPane.YES_OPTION) 
{ 
//以下是将文件写入计算机! 
try { 
JFileChooser fileSave = new JFileChooser(); 
fileSave.setDialogTitle("保存文件"); 
//fileSave.addChoosableFileFilter(new myFilter("*.txt","Files(*.txt)")); 
fileSave.addChoosableFileFilter(fileSave.getFileFilter()); 
if (fileSave.APPROVE_OPTION != fileSave.showSaveDialog(this)) 
return; 
BufferedWriter dataOut = new BufferedWriter(new BufferedWriter(new 
FileWriter(fileSave.getSelectedFile()))); 
String c = null; 
do { 
String str = fileArea.getText(); 
dataOut.write(str); 
dataOut.close(); 
} 
while (c != null); 
} 
catch (Exception e2) { 
System.out.println("Catch exception:有错误!" + e2.toString()); 
} 
} 
else if (decision == JOptionPane.NO_OPTION) 
System.exit(1); 
else if (decision == JOptionPane.CANCEL_OPTION); 
; 
} 
//innerclass.fileSave_actionPerformed(); 
} 
public void fileSave_actionPerformed(ActionEvent e1) 
{ 

//以下是将文件写入计算机! 
try 
{ 
JFileChooser fileSave=new JFileChooser(); 
fileSave.setDialogTitle("保存文件" ); 
//fileSave.addChoosableFileFilter(new myFilter("*.txt","Files(*.txt)")); 
fileSave.addChoosableFileFilter(fileSave.getFileFilter()); 
if(fileSave.APPROVE_OPTION!=fileSave.showSaveDialog(this))return; 
BufferedWriter dataOut=new BufferedWriter(new BufferedWriter(new FileWriter(fileSave.getSelectedFile()+".txt"))); 
//RandomAccessFile dataOut=new RandomAccessFile(fileSave.getSelectedFile(),"rw"); 
String c=null; 
do 
{ 
String str=fileArea.getText(); 
dataOut.write(str); 
dataOut.close(); 
} 
while(c!=null); 
} 
catch(Exception e2) 
{ 
System.out.println("Catch exception:有错误!"+e2.toString()); 
} 
} 
public static void main(String arg[]) 
{ 
Note nt=new Note(); 
nt.show(); 
} 
public void fileCut_actionPerformed(ActionEvent e) 
{ 
fileArea.cut(); 
} 
public void filePaste_actionPerformed(ActionEvent e) 
{ 
fileArea.paste(); 
} 
public void fileColor_actionPerformed(ActionEvent e) 
{ 
JColorChooser fileColor=new JColorChooser(); 
//fileArea.setForeground(fileColor.showDialog(this,"颜色",Color.red)); 
//fileArea.setSelectionColor(fileColor.showDialog(this,"颜色",Color.red)); 
fileArea.setSelectionColor(fileColor.showDialog(this,"颜色",Color.black)); 
} 
} 
//文件过滤类怎么写！