Windows自带记事本的java语言代码

 

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import java.text.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.undo.*;
class TextPad extends JFrame implements ActionListener
{
   JTextArea jta=new JTextArea("欢迎大家使用",18,52);
   JCheckBoxMenuItem mto1=new JCheckBoxMenuItem("自动换行");//,true);
   UndoableEditListener ue=new UndoHander();
   UndoManager undo = new UndoManager();
   int StartFindPos=0,a=0,b=0;
   public TextPad()
   {
   this.setTitle("JAVA记事本");
   this.setLocation(180,100);
   JScrollPane jsp=new JScrollPane(jta);
   JMenu mf=new JMenu("文件(F)");
   JMenuItem mtf1=new JMenuItem("新建");
   mtf1.addActionListener(this);
   JMenuItem mtf2=new JMenuItem("打开");
   mtf2.addActionListener(this);
   JMenuItem mtf3=new JMenuItem("保存");
   mtf3.addActionListener(this);
   JMenuItem mtf4=new JMenuItem("另存为");
   mtf4.addActionListener(this);
   JMenuItem mtf5=new JMenuItem("打印");
   mtf5.addActionListener(this);
   JMenuItem mtf6=new JMenuItem("退出");
   mtf6.addActionListener(this);
   JMenu me=new JMenu("编辑(E)");
   JMenuItem mte1=new JMenuItem("撤消");
   mte1.addActionListener(this);
   jta.getDocument().addUndoableEditListener(ue);
   if(undo.canUndo())
   {
    mte1.setEnabled(false);
   }
   JMenuItem mte2=new JMenuItem("剪切");
   mte2.addActionListener(this);
   JMenuItem mte3=new JMenuItem("复制");
   mte3.addActionListener(this);
   JMenuItem mte4=new JMenuItem("粘贴");
   mte4.addActionListener(this);
   JMenuItem mte6=new JMenuItem("查找");
   mte6.addActionListener(this);
   JMenuItem mte8=new JMenuItem("替换");
   mte8.addActionListener(this);
   JMenuItem mte10=new JMenuItem("全选");
   mte10.addActionListener(this);
   JMenuItem mte11=new JMenuItem("日期/时间");
   mte11.addActionListener(this);
   JMenu mo=new JMenu("格式(O)");
   mto1.addActionListener(this);
   JMenuItem mto2=new JMenuItem("字体");
   mto2.addActionListener(this);
   JMenu mv=new JMenu("查看(V)");
   JMenuItem mtv1=new JMenuItem("状态栏");
   mtv1.setEnabled(false);
   JMenu mh=new JMenu("帮助(H)");
   JMenuItem mth1=new JMenuItem("关于记事本");
   mth1.addActionListener(this);
   JMenuBar mb=new JMenuBar();
   this.addWindowListener(new WindowAdapter()
   {
     public void windowClosing(WindowEvent e)
    {
      System.exit(0);
    }
   }
   );
   mb.add(mf);
   mb.add(me);
   mb.add(mo);
   mb.add(mv);
   mb.add(mh);
   this.setJMenuBar(mb);
   mf.add(mtf1);
   mf.add(mtf2);
   mf.add(mtf3);
   mf.add(mtf4);
   mf.add(mtf5);
   mf.addSeparator();
   mf.add(mtf6);
   me.add(mte1);
   me.addSeparator();
   me.add(mte2);
   me.add(mte3);
   me.add(mte4);
   me.addSeparator();
   me.add(mte6);
   me.add(mte8);
   me.addSeparator();
   me.add(mte10);
   me.add(mte11);
   mo.add(mto1);
   mo.add(mto2);
   mv.add(mtv1);
   mh.add(mth1);
   this.getContentPane().add(jsp);
   this.setSize(600,400);
   this.setResizable(true);
   this.setVisible(true);
   }
public void actionPerformed(ActionEvent e)
{

if(e.getActionCommand().equals("打开"))
{
   try
   {
    Frame f=new Frame();
    FileDialog fd=new FileDialog(f,"打开文件",FileDialog.LOAD);
    fd.setVisible(true);
    String fpath=fd.getDirectory();
    String fname=fd.getFile();
    BufferedReader br=new BufferedReader(new FileReader(fpath+fname));
    jta.setText("");
    String s=br.readLine();
    while(s!=null)
    {
     jta.append(s+"/n");
     s=br.readLine();
    }
    br.close();
    }
    catch(Exception ex)
   {
   }
}
   if(e.getActionCommand().equals("保存"))
   {
    String fns=null;
    Frame f=new Frame("保存");
    FileDialog fd=new FileDialog(f,"保存文件",FileDialog.SAVE);
    fd.setFile("*.txt");
    fd.setVisible(true);
try
{
    String savepath=fd.getDirectory();
    String savename=fd.getFile();
    if(savename!=null)
    {
      PrintWriter pw=new PrintWriter(new BufferedWriter(new FileWriter(savepath+savename)));
      pw.write(jta.getText(),0,jta.getText().length());
      pw.flush();
    }
   }
   catch(Exception esave)
   {
   }
}
if(e.getActionCommand().equals("新建"))
{
    jta.setText("");
}
if(e.getActionCommand().equals("另存为"))
{
   Frame f=new Frame("保存");
   FileDialog fd=new FileDialog(f,"文件另存为",FileDialog.SAVE);
   fd.setVisible(true);
   try
   {
     String savepath=fd.getDirectory();
     String savename=fd.getFile();
     if(savename!=null)
     {
       PrintWriter pw=new PrintWriter(new BufferedWriter(new FileWriter(savepath+savename)));
       pw.write(jta.getText(),0,jta.getText().length());
       pw.flush();
     }
    }
   catch(Exception esave)
   {
   }
}
if(e.getActionCommand().equals("退出"))
{
    System.exit(0);
}
if(e.getActionCommand().equals("撤消"))
{
   try
{
    undo.undo();
}
    catch(Exception eundo)
   {
   }
}
if(e.getActionCommand().equals("剪切"))
{
   jta.cut();
}
if(e.getActionCommand().equals("复制"))
{
    jta.copy();
}
if(e.getActionCommand().equals("粘贴"))
{
   jta.paste();
}
if(e.getActionCommand().equals("全选"))
{
    jta.selectAll();
}
if(e.getActionCommand().equals("查找"))
{
   try
   {
    final JDialog jd=new JDialog(this,"查找",true);
    GridBagLayout gbl=new GridBagLayout();
    GridBagConstraints gbc=new GridBagConstraints();
    gbc.weightx=0.5;
    gbc.weighty=0.5;
    gbc.gridwidth=1;
    gbc.gridheight=1;
    jd.getContentPane().setLayout(gbl);
    jd.setSize(380,100);
    jd.setResizable(false);
    final JTextField jtf=new JTextField(15);
    JLabel jlFind=new JLabel("查找内容:");
    jd.getContentPane().add(jlFind);
    JButton jbFind=new JButton("查找");
    jbFind.addActionListener(new ActionListener()//查找的监听
{
     public void actionPerformed(ActionEvent efind)
   {
      String strA=jta.getText();
      String strB=jtf.getText();
      if(a>=0)
    {
          a=strA.indexOf(strB,StartFindPos);
          b=strB.length();
          StartFindPos=a+b;
          if(a==-1)
          {
             JOptionPane.showMessageDialog(null, "没有您要查找的信息", "查找结果",1);
             a=0;
             StartFindPos=0;
          }
          jta.select(a,StartFindPos);
    }
}
}
);
JButton jbCancel=new JButton("取消");
jbCancel.addActionListener(new ActionListener()
{
    public void actionPerformed(ActionEvent ejb)
   {
      jd.dispose();
   }
}
);
jd.getContentPane().add(jtf);
jd.getContentPane().add(jbFind);
jd.getContentPane().add(jbCancel);
jd.setLocation(240,200);
jd.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
jd.setVisible(true);
}
catch(Exception efind)
{
}
}
if(e.getActionCommand().equals("替换"))
{
final JDialog jd=new JDialog(this,"替换",true);
GridBagLayout gbl=new GridBagLayout();//布局管理器,
GridBagConstraints gbc=new GridBagConstraints();
gbc.weightx=1;
gbc.weighty=1;
gbc.gridwidth=1;
gbc.gridheight=1;
JLabel jlFind=new JLabel("查找:");
JLabel jp=new JLabel("替换内容:");
final JTextField jtf=new JTextField(15);//"替换内容"的单行文本框的长度
final JTextField jtf1=new JTextField(15);//"查找"单行文本框的长度
jd.getContentPane().setLayout(gbl);//显示出对话框？
jd.setSize(330,150);
jd.setResizable(false);
final JButton jbReplace=new JButton("替换");
final JButton jbReplaceAll=new JButton("替换所有");
final JButton jbCancel=new JButton("取消");
final JButton jbFind=new JButton("查找");
gbc.gridx=0;
gbc.gridy=0;
jd.getContentPane().add(jlFind,gbc);
gbc.gridx=1;
gbc.gridy=0;
jd.getContentPane().add(jtf1,gbc);
gbc.gridx=2;
gbc.gridy=0;
jd.getContentPane().add(jbFind,gbc);
gbc.gridx=0;
gbc.gridy=1;
jd.getContentPane().add(jp,gbc);
gbc.gridx=1;
gbc.gridy=1;
jd.getContentPane().add(jtf,gbc);
gbc.gridx=2;
gbc.gridy=1;
jd.getContentPane().add(jbReplace,gbc);
gbc.gridx=2;
gbc.gridy=2;
jd.getContentPane().add(jbReplaceAll,gbc);
gbc.gridx=2;
gbc.gridy=3;
jd.getContentPane().add(jbCancel,gbc);
jbFind.addActionListener(new ActionListener()//查找监听
{
      public void actionPerformed(ActionEvent efind)
      {
        String strA=jta.getText();
        String strB=jtf1.getText();
        if(a>=0)
        {
         a=strA.indexOf(strB,StartFindPos);
         b=strB.length();
         StartFindPos=a+b;
         if(a==-1)
          {
           JOptionPane.showMessageDialog(null, "没有您要查找的信息", "查找结果",1);
           a=0;
           StartFindPos=0;
          }
         jta.select(a,StartFindPos);
        }
     }
}
);
jbReplace.addActionListener(new ActionListener()//替换的监听
{
    public void actionPerformed(ActionEvent e)
    {
      if(e.getActionCommand().equals("替换"))
      {
       String strRepleace=jtf.getText();
       jta.replaceSelection(strRepleace);
      }
    }
}
);
jbReplaceAll.addActionListener(new ActionListener()//全部替换加监听
{
    public void actionPerformed(ActionEvent e)
    {
      while(a>-1)
      {
        String strA=jta.getText();
        String strB=jtf1.getText();
        a=strA.indexOf(strB,StartFindPos);
        if(a==-1)
        {
          break;
        }
        b=strB.length();
        StartFindPos=a+b;
        jta.select(a,StartFindPos);
        String strRepleaceAll=jtf.getText();
        jta.replaceSelection(strRepleaceAll);
        StartFindPos=a+b;
      }
     JOptionPane.showMessageDialog(null, "全部替换完毕", "替换内容",1);
     a=0;
     StartFindPos=0;
   }
}
);
jbCancel.addActionListener(new ActionListener()
{
    public void actionPerformed(ActionEvent ejb)
    {
      jd.dispose();
    }
}
);
jd.setLocation(240,200);
jd.setVisible(true);
jd.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
if(e.getActionCommand().equals("日期/时间"))
{
final JDialog jd=new JDialog(this,"插入日期");
JPanel jp1=new JPanel();
jp1.setLayout(new FlowLayout(FlowLayout.LEFT));
final JTextField jtf=new JTextField(10);
JButton jbOK=new JButton("确定");
JButton jbCancel=new JButton("取消");
jp1.add(jtf);
jp1.add(jbOK);
jp1.add(jbCancel);
jd.getContentPane().add(jp1,"North");
JPanel jp2=new JPanel();
jp2.setLayout(new FlowLayout(FlowLayout.LEFT));
final JCheckBox jcb1=new JCheckBox("格式一");
final JCheckBox jcb2=new JCheckBox("格式二");
final JCheckBox jcb3=new JCheckBox("格式三");
jp2.add(jcb1);
jp2.add(jcb2);
jp2.add(jcb3);
jd.getContentPane().add(jp2,"Center");
jd.setSize(220,120);
jd.setResizable(false);
jd.setLocation(240,200);
final SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar cl=Calendar.getInstance();
DateFormat df=DateFormat.getInstance();
final String sdate=df.format(cl.getTime());
jcb1.addActionListener(new ActionListener()
{
     public void actionPerformed(ActionEvent e)
     {
     if(e.getActionCommand().equals("格式一"))
    {
         if(jcb1.isSelected())
        {
          try
         {
           SimpleDateFormat sdf1=new SimpleDateFormat("yy年MM月dd日");
           Date d=sdf.parse(sdate);
           jtf.setText(sdf1.format(d));//插入文本
           jcb2.setEnabled(false);//其他复选框不可选
           jcb3.setEnabled(false);
         }
         catch(Exception estyle1)
         {
           estyle1.printStackTrace();//追踪输出到指定的输出流
         }
        }
        else
        {
           jcb2.setEnabled(true);
           jcb3.setEnabled(true);
         }
      try
     {
      System.out.println(jta.getLineStartOffset(3));//?
     }
     catch(Exception eee)
     {
     }
   }
}
}
);
jcb2.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
    if(e.getActionCommand().equals("格式二"))
    {
     if(jcb2.isSelected())
     {
     try
     {
      SimpleDateFormat sdf1=new SimpleDateFormat("yy/MM/dd");
      Date d=sdf.parse(sdate);
      jtf.setText(sdf1.format(d));
      jcb1.setEnabled(false);
      jcb3.setEnabled(false);
     }
      catch(Exception estyle2)
     {
      estyle2.printStackTrace();
     }
    }
     else
     {
      jcb1.setEnabled(true);
      jcb3.setEnabled(true);
     }
    }
}
}
);
jcb3.addActionListener(new ActionListener()
{
    public void actionPerformed(ActionEvent e)
    {
      if(e.getActionCommand().equals("格式三"))
      {
        if(jcb3.isSelected())
        {
          jtf.setText(sdate);
          jcb1.setEnabled(false);
          jcb2.setEnabled(false);
        }
       else
       {
        jcb1.setEnabled(true);
        jcb2.setEnabled(true);
       }
      }
    }
}
);
jbOK.addActionListener(new ActionListener()
{
   public void actionPerformed(ActionEvent e)
   {
   if(e.getActionCommand().equals("确定"))
   {
     int pos=jta.getCaretPosition();
     jta.insert(jtf.getText(),pos);
    }
   }
}
);
jbCancel.addActionListener(new ActionListener()
{
   public void actionPerformed(ActionEvent ejb)
{
     jd.dispose();
   }
}
);
jd.setVisible(true);
jd.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
if(e.getActionCommand().equals("自动换行"))
{
    if(mto1.getState())
    {
      jta.setLineWrap(true);
      jta.setWrapStyleWord(true);
     }
    else
    {
      jta.setLineWrap(false);
      jta.setWrapStyleWord(false);
    }
}
if(e.getActionCommand().equals("字体"))
{
    final JDialog jd=new JDialog(this,"字体设置");
    jd.setLocation(240,200);
    GridBagLayout gbl=new GridBagLayout();
    GridBagConstraints gbc=new GridBagConstraints();
    JButton jbOK=new JButton("确定");
    JButton jbCancel=new JButton("取消");
    JTextField jtf1=new JTextField(6);
    final JTextArea jtaview=new JTextArea(4,8);
    final JTextField jtf2=new JTextField(6);
    final JTextField jtf3=new JTextField(3);
    JComboBox jcb1=new JComboBox();//下拉列表组合的组件
    final JComboBox jcb2=new JComboBox();
    jcb2.addItem("BOLD");
    jcb2.addItem("ITALIC");
    jcb2.addItem("PLAIN");
    jcb2.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent e)
     {
       jtf2.setText((String)jcb2.getSelectedItem());
     }
    }
    );
   final JComboBox jcb3=new JComboBox();
   jcb3.addItem("14");
   jcb3.addItem("18");
   jcb3.addItem("22");
   jcb3.addItem("26");
   jcb3.addItem("30");
   jcb3.addItem("34");
   jcb3.addActionListener(new ActionListener()
   {
     public void actionPerformed(ActionEvent e)
     {
       jtf3.setText((String)jcb3.getSelectedItem());
    }
   }
   );
gbc.gridheight=1;
gbc.gridwidth=1;
gbc.weightx=0.5;
gbc.weighty=0.5;
jd.getContentPane().setLayout(gbl);
JLabel jl2=new JLabel("字型:");
JLabel jl3=new JLabel("大小:");
gbc.gridx=0;
gbc.gridy=0;
jd.getContentPane().add(jl2,gbc);
gbc.gridx=2;
gbc.gridy=0;
jd.getContentPane().add(jl3,gbc);
gbc.gridx=0;
gbc.gridy=1;
jd.getContentPane().add(jtf2,gbc);
gbc.gridx=2;
gbc.gridy=1;
jd.getContentPane().add(jtf3,gbc);
gbc.gridx=0;
gbc.gridy=2;
jd.getContentPane().add(jcb2,gbc);
gbc.gridx=2;
gbc.gridy=2;
jd.getContentPane().add(jcb3,gbc);
gbc.gridx=4;
gbc.gridy=1;
jd.getContentPane().add(jbOK,gbc);
gbc.gridx=4;
gbc.gridy=2;
jd.getContentPane().add(jbCancel,gbc);
jbOK.addActionListener(new ActionListener()
   {
     public void actionPerformed(ActionEvent e)
     {

        if(jtf2.getText().equals("PLAIN"))
        {
          int fontsize=Integer.parseInt(jtf3.getText());
          int fontstyle=0;
          Font f=new Font("字体设置",fontstyle,fontsize);
          jta.setFont(f);
        }
        if(jtf2.getText().equals("BOLD"))
        {
          int fontsize=Integer.parseInt(jtf3.getText());
          int fontstyle=1;
          Font f=new Font("字体设置",fontstyle,fontsize);
          jta.setFont(f);
        }
      if(jtf2.getText().equals("ITALIC"))
      {
        int fontsize=Integer.parseInt(jtf3.getText());
        int fontstyle=2;
        Font f=new Font("字体设置",fontstyle,fontsize);
        jta.setFont(f);
      }
     jd.dispose();
   }

 

}
);
jbCancel.addActionListener(new ActionListener()
{
    public void actionPerformed(ActionEvent e)
    {
        jd.dispose();
    }
}
);
   jd.setSize(200,120);
   jd.setResizable(false);
   jd.setVisible(true);
   jd.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
if(e.getActionCommand().equals("关于记事本"))
   {
     JOptionPane jop=new JOptionPane(null,JOptionPane.INFORMATION_MESSAGE);
     jop.showMessageDialog(null,"","关于记事本",JOptionPane.OK_OPTION);
}
}
    class UndoHander implements UndoableEditListener
    {
      public void undoableEditHappened(UndoableEditEvent eundo)
      {
        undo.addEdit(eundo.getEdit());
      }
     }
     public static void main(String args[])
    {
        new TextPad();
    }
}