jishiben.txt

一个简单的java记事本

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import java.awt.datatransfer.*;
public class yangweitao extends Frame implements ActionListener,MouseListener{
FileDialog fileDlg;
String str,fileName;
byte byteBuf[]=new byte[10000];
Toolkit toolKit=Toolkit.getDefaultToolkit();
    Clipboard clipBoard=toolKit.getSystemClipboard();
    TextArea ta=new TextArea();
    PopupMenu pm=new PopupMenu();
MenuBar mb=new MenuBar();
Menu m1=new Menu("文件");
Menu m2=new Menu("编辑");
Menu m3=new Menu("工具");
MenuItem cut2=new MenuItem("剪切");
MenuItem copy2=new MenuItem("复制");
MenuItem paste2=new MenuItem("粘贴");
  
MenuItem cut=new MenuItem("剪切");
MenuItem copy=new MenuItem("复制");
MenuItem paste=new MenuItem("粘贴");
MenuItem computer=new MenuItem("计算器");
  
MenuItem open=new MenuItem("打开");
MenuItem close=new MenuItem("关闭");
MenuItem save=new MenuItem("保存");
MenuItem exit=new MenuItem("推出");
   yangweitao(){
   setTitle("简易文件编辑器");
   setSize(400,280);
   add("Center",ta);
   addWindowListener(new WindowAdapter(){
    public void windowClosing(WindowEvent e){
     System.exit(0);
    }
   }); 
   m1.add(open);
   m1.add(close);
   m1.add(save);
   m1.addSeparator();

   m1.add(exit);
   m2.add(cut);
   m2.add(paste);
   m2.add(copy);
   m3.add(computer);  
  
   open.addActionListener(this);
   close.addActionListener(this);
   save.addActionListener(this);
   exit.addActionListener(this);
  
   cut.addActionListener(this);
   copy.addActionListener(this);
   paste.addActionListener(this);
  
   cut2.addActionListener(this);
   copy2.addActionListener(this);
   paste2.addActionListener(this);
  
   computer.addActionListener(this);
   mb.add(m1);
   mb.add(m2);
   mb.add(m3);
   pm.add(cut2);
   pm.add(paste2);
   pm.add(copy2);
   ta.add(pm);
   this.setMenuBar(mb);
   ta.addMouseListener(this); 
   show();
}
public void actionPerformed(ActionEvent e){
  
   if(e.getSource()==exit)
     System.exit(0);
   else if(e.getSource()==close)
     ta.setText(null);
   else if(e.getSource()==open){
     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);
     ta.setText(str);
     setTitle("adsad"+fileName);
     }catch(IOException ioe){}
   }
   else if(e.getSource()==save){
    fileDlg=new FileDialog(this,"保存文件",FileDialog.SAVE);
    fileDlg.show();
    fileName=fileDlg.getFile();
    str=ta.getText();
    byteBuf=str.getBytes();
    try{
     FileOutputStream out=new FileOutputStream(fileName);
     out.write(byteBuf);
     out.close();
    }catch(IOException ioe){}
   }  
   else if(e.getActionCommand()=="剪切"){  
     String text=ta.getSelectedText();
       StringSelection selection=new StringSelection(text);
       clipBoard.setContents(selection,null);
       ta.replaceRange("",ta.getSelectionStart(),ta.getSelectionEnd());
       }     
   else if(e.getActionCommand()=="复制")
       {String text=ta.getSelectedText();
       StringSelection selection=new StringSelection(text);
       clipBoard.setContents(selection,null);
       }
   else if(e.getActionCommand()=="粘贴")
      {Transferable contents=clipBoard.getContents(this);
       if(contents==null) return;
       String text;
       text="";
       try{
            text=(String)contents.getTransferData(DataFlavor.stringFlavor);
        }catch(Exception exception){
        }
       ta.replaceRange(text,ta.getSelectionStart(),ta.getSelectionEnd());
      } 
   else if(e.getActionCommand()=="计算器") {
    Runtime r= Runtime.getRuntime();
    try {
     r.exec("calc");
    } catch (IOException e1) {}
       }  
}
public void mouseReleased(MouseEvent e){
    if(e.isPopupTrigger())
       pm.show(this,e.getX(),e.getX());
      }
      public void mouseClicked(MouseEvent e){}
    public void mouseEntered(MouseEvent e){}
    public void mouseExited(MouseEvent e){}
public void mousePressed(MouseEvent e){}
   public static void main(String args[]){
   new yangweitao();
} 
}