noteedit.java

用java编写的记事本的程序代码 很不错的呦

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;
 FontDialog fontSet;  //引用字体设置对话框
 
 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()=="字体...")
     {
   	  fontSet=new FontDialog(this);
   	  fontSet.setVisible(true);       //显示字体设置对话框
          tArea.setFont(fontSet.font);
      }
   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){}
    
      }



  }

}