mynotepad.java

我自己做的简单记事本

import java.awt.*;
import java.io.*;
import java.awt.event.*;
import javax.swing.undo.UndoManager;
import javax.swing.*;
import javax.swing.event.UndoableEditListener;

class FileWindows extends Frame implements ActionListener,WindowListener,TextListener
{

        FileDialog filedialog_save,filedialog_load;
        Dialog about,font;
        MenuBar menubar;
        Menu menu,menuEdit,menuHelp,menuFormat,menuColor;
        MenuItem itemOpen,itemSave,itemExit,itemNew;
        MenuItem itemFind,itemReplace,itemCut,itemPaste,itemCopy,itemDelete,itemSelectAll,itemTime;
        MenuItem itemAbout;
        MenuItem /*itemWrap,itemUndo*/itemFont,itemFgColor,itemBgColor;
        TextArea text;

        BufferedReader in;
        FileReader file_reader;
        BufferedWriter out;
        FileWriter tofile;
        boolean changed=false;

       // UndoManager undo=new UndoManager();
      //  UndoableEditListener undoHandler=new undoHandler();
        String temp;

        FileWindows()
        {
                super("simple notepad!");
//		Container container=getContentPane();
                text=new TextArea();
        //	container.add(text);
                text.addTextListener(this);
                add(text,BorderLayout.CENTER);
                setBounds(200,200,400,500);
                setVisible(true);
                menubar=new MenuBar();
                menu=new Menu("file");
                menuEdit=new Menu("edit");
                menuFormat=new Menu("format");
                menuHelp=new Menu("help");
                menuColor=new Menu("color");
                itemOpen=new MenuItem("open");
                itemSave=new MenuItem("save");
                itemExit=new MenuItem("exit");
                itemNew=new MenuItem("new");
                itemFind=new MenuItem("find");
                itemReplace=new MenuItem("replace");
                itemCut=new MenuItem("cut");
                itemPaste=new MenuItem("paste");
                itemCopy=new MenuItem("copy");
                itemDelete=new MenuItem("delete");
                itemSelectAll=new MenuItem("select all");
                itemTime=new MenuItem("time/date");
//		itemWrap=new MenuItem("word wrap");
         //       itemUndo=new MenuItem("undo");
                itemFont=new MenuItem("font");
                itemFgColor=new MenuItem("foreground color");
                itemBgColor=new MenuItem("background color");
                itemAbout=new MenuItem("about notepad");
                menu.add(itemNew);
                menu.addSeparator();
                menu.add(itemOpen);
                menu.add(itemSave);
                menu.addSeparator();
                menu.add(itemExit);
                menuEdit.add(itemFind);
                menuEdit.add(itemReplace);
                menuEdit.addSeparator();
                menuEdit.add(itemCut);
                menuEdit.add(itemDelete);
                menuEdit.add(itemPaste);
                menuEdit.add(itemCopy);
                menuEdit.addSeparator();
                menuEdit.add(itemSelectAll);
                menuEdit.addSeparator();
                menuEdit.add(itemTime);
        //	menuFormat.add(itemWrap);
     //           menuFormat.add(itemUndo);
       // 	menuFormat.addSeparator();
                menuFormat.add(menuColor);
                menuColor.add(itemFgColor);
                menuColor.add(itemBgColor);
                menuFormat.add(itemFont);
                menuHelp.add(itemAbout);
                itemOpen.addActionListener(this);
                itemSave.addActionListener(this);
                itemExit.addActionListener(this);
                itemNew.addActionListener(this);
                itemFind.addActionListener(this);
                itemReplace.addActionListener(this);
                itemCut.addActionListener(this);
                itemDelete.addActionListener(this);
                itemCopy.addActionListener(this);
                itemPaste.addActionListener(this);
                itemSelectAll.addActionListener(this);
//		itemWrap.addActionListener(this);
   //             itemUndo.addActionListener(this);
                itemTime.addActionListener(this);
                itemAbout.addActionListener(this);
                itemBgColor.addActionListener(this);
                itemFgColor.addActionListener(this);
                itemFont.addActionListener(this);
                menubar.add(menu);
                menubar.add(menuEdit);
                menubar.add(menuFormat);
                menubar.add(menuHelp);
                setMenuBar(menubar);
                filedialog_save=new FileDialog(this,"save files",FileDialog.SAVE);
                filedialog_load=new FileDialog(this,"open files",FileDialog.LOAD);
                filedialog_save.addWindowListener(new WindowAdapter()
                {
                        public void windowClosing(WindowEvent e)
                        {
                                filedialog_save.setVisible(false);
                        }
                });
                filedialog_load.addWindowListener(new WindowAdapter()
                {
                        public void windowClosing(WindowEvent e)
                        {
                                filedialog_load.setVisible(false);
                        }
                });
                addWindowListener(this);
        }

        public void textValueChanged(TextEvent e)
        {
                changed=true;
        }

        public void windowActivated(WindowEvent e)
        {

        }

        public void windowDeactivated(WindowEvent e)
        {

        }

        public void windowClosing(WindowEvent e)
        {
                if(changed==true)
                {
                        int n=JOptionPane.showConfirmDialog(this,"Save or Not?", "confirm dialog",JOptionPane.YES_NO_CANCEL_OPTION);
                        if(n==JOptionPane.YES_OPTION)
                        {
                                filedialog_save.setVisible(true);
                                if(filedialog_save.getFile()!=null)
                                {
                                        try
                                        {
                                                File file=new File(filedialog_save.getDirectory(),filedialog_save.getFile());
                                                tofile=new FileWriter(file);
                                                out=new BufferedWriter(tofile);
                                                out.write(text.getText(),0,(text.getText()).length());
                                                out.close();
                                                tofile.close();
                                        }
                                        catch(IOException e2)
                                        {

                                        }
                                }
                                System.exit(0);
                        }
                        else if(n==JOptionPane.NO_OPTION)
                        {
                                System.exit(0);
                        }
                        else if(n==JOptionPane.CANCEL_OPTION)
                        {

                        }
                }
                else if(changed==false)
                {
                        System.exit(0);
                }
        }

        public void windowClosed(WindowEvent e)
        {

        }

        public void windowIconified(WindowEvent e)
        {

        }

        public void windowDeiconified(WindowEvent e)
        {

        }

        public void windowOpened(WindowEvent e)
        {

        }

        public void actionPerformed(ActionEvent e)
        {
                if(e.getSource()==itemOpen)
                {
                        filedialog_load.setVisible(true);
                        text.setText(null);
                        String s;
                        if(filedialog_load.getFile()!=null)
                        {
                                try
                                {
                                        File file=new File(filedialog_load.getDirectory(),filedialog_load.getFile());
                                        file_reader=new FileReader(file);
                                        in=new BufferedReader(file_reader);
                                        while((s=in.readLine())!=null){
                                                text.append(s+'\n');
                                                }
                                        in.close();
                                        file_reader.close();
                                        }
                                catch(IOException e2)
                                {
                                        JOptionPane.showMessageDialog(this, "can not open the files");
                                }
                        }
                }

                else if(e.getSource()==itemSave)
                {
                        filedialog_save.setVisible(true);
                        if(filedialog_save.getFile()!=null)
                        {
                                try
                                {
                                        File file=new File(filedialog_save.getDirectory(),filedialog_save.getFile());
                                        tofile=new FileWriter(file);
                                        out=new BufferedWriter(tofile);
                                        out.write(text.getText(),0,(text.getText()).length());
                                        out.close();
                                        tofile.close();
                                }
                                catch(IOException e2)
                                {
                                        JOptionPane.showMessageDialog(this, e2.getMessage());
                                }
                        }
                }

                else if(e.getSource()==itemExit)
                {
                        if(changed==true)
                        {
                                int n=JOptionPane.showConfirmDialog(this,"Save or Not?", "confirm dialog",JOptionPane.YES_NO_CANCEL_OPTION);
                                if(n==JOptionPane.YES_OPTION)
                                {
                                        filedialog_save.setVisible(true);
                                        if(filedialog_save.getFile()!=null)
                                        {
                                                try
                                                {
                                                        File file=new File(filedialog_save.getDirectory(),filedialog_save.getFile());
                                                        tofile=new FileWriter(file);
                                                        out=new BufferedWriter(tofile);
                                                        out.write(text.getText(),0,(text.getText()).length());
                                                        out.close();
                                                        tofile.close();
                                                }
                                                catch(IOException e2)
                                                {

                                                }
                                        }
                                        System.exit(0);
                                }
                                else if(n==JOptionPane.NO_OPTION)
                                {
                                        System.exit(0);
                                }
                                else if(n==JOptionPane.CANCEL_OPTION)
                                {

                                }
                        }
                        else if(changed==false)
                        {
                                System.exit(0);
                        }
                }

                else if(e.getSource()==itemNew)
                {
                        if(changed==true)
                        {
                                int n=JOptionPane.showConfirmDialog(this,"Save or Not?", "confirm dialog",JOptionPane.YES_NO_CANCEL_OPTION);
                                if(n==JOptionPane.YES_OPTION)
                                {
                                        filedialog_save.setVisible(true);
                                        if(filedialog_save.getFile()!=null)
                                        {
                                                try
                                                {
                                                        File file=new File(filedialog_save.getDirectory(),filedialog_save.getFile());
                                                        tofile=new FileWriter(file);
                                                        out=new BufferedWriter(tofile);
                                                        out.write(text.getText(),0,(text.getText()).length());
                                                        out.close();
                                                        tofile.close();
                                                }
                                                catch(IOException e2)
                                                {
                                                        JOptionPane.showMessageDialog(this, e2.getMessage());
                                                }
                                        }
                                        this.setVisible(false);
                                        FileWindows obj=new FileWindows();
                                        obj.setVisible(true);
                                }
                                else if(n==JOptionPane.NO_OPTION)
                                {
                                        FileWindows obj=new FileWindows();
                                        obj.setVisible(true);
                                        this.setVisible(false);
                                }
                                else if(n==JOptionPane.CANCEL_OPTION)
                                {

                                }
                        }
                        else if(changed==false)
                        {
                                FileWindows obj=new FileWindows();
                                obj.setVisible(true);
                                this.setVisible(false);
                        }
                }

                else if(e.getSource()==itemFind)
                {
                        Find find=new Find(this,text);
                        find.showFind();
                }

                else if(e.getSource()==itemReplace)
                {
                        Find find=new Find(this,text);