main.java

本程序不仅实现了记事本基本的功能

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package jnotepad;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.text.DateFormat;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
import java.util.*;
import javax.swing.undo.UndoManager;

class JNotepad extends JFrame implements ActionListener, ItemListener, Runnable {

    JNotepad() {
        super("记事本   Time@");
        this.setLayout(new BorderLayout());//null
        text.setLineWrap(true);//自动换行
        text.setBackground(new Color(200, 255, 200));
        text.getDocument().addUndoableEditListener(Un_Re);
        this.addWindowListener(new WindowAdapter() {

            @Override
            public void windowClosing(WindowEvent e) {
                try {
                    exit();
                } catch (IOException ex) {
                    Logger.getLogger(JNotepad.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        });

        menubar = new JMenuBar();
        menu = new JMenu("文件(F)");
        this.setJMenuBar(menubar);//Why not  this.add(menubar);
        menubar.add(menu);

        newfile = new JMenuItem("新建(N)");
        newfile.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, KeyEvent.CTRL_MASK, false));
        menu.add(newfile);
        newfile.addActionListener(this);


        openfile = new JMenuItem("打开(O)...");
        openfile.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, KeyEvent.CTRL_MASK, false));
        menu.add(openfile);
        openfile.addActionListener(this);

        savefile = new JMenuItem("保存(S)");
        savefile.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, KeyEvent.CTRL_MASK, false));
        menu.add(savefile);
        savefile.addActionListener(this);

        saveas = new JMenuItem("另存为(A)...");
        menu.add(saveas);
        saveas.addActionListener(this);

        menu.addSeparator();

        recentfiles = new JMenu("最近打开的文件(RF)");
        menu.add(recentfiles);
        recentfiles.addActionListener(this);

        menu.addSeparator();

        exit = new JMenuItem("退出(X)");
        menu.add(exit);
        exit.addActionListener(this);

        edit = new JMenu("编辑(E)");
        menubar.add(edit);

        undoItem = new JMenuItem("撤销(U)");
        undoItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Z, KeyEvent.CTRL_MASK, false));
        edit.add(undoItem);
        undoItem.addActionListener(this);

        redoItem = new JMenuItem("重做(R)");
        redoItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_R, KeyEvent.CTRL_MASK, false));
        edit.add(redoItem);
        redoItem.addActionListener(this);
        redoItem.setEnabled(false);

        edit.addSeparator();

        cutItem = new JMenuItem("剪切(T)");
        cutItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, KeyEvent.CTRL_MASK, false));
        edit.add(cutItem);
        cutItem.addActionListener(this);

        copyItem = new JMenuItem("复制(C)");
        copyItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, KeyEvent.CTRL_MASK, false));
        edit.add(copyItem);
        copyItem.addActionListener(this);

        pasteItem = new JMenuItem("粘贴(P)");
        pasteItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, KeyEvent.CTRL_MASK, false));
        edit.add(pasteItem);
        pasteItem.addActionListener(this);

        deleteItem = new JMenuItem("删除(L)");
        deleteItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, KeyEvent.CTRL_MASK, true));
        edit.add(deleteItem);
        deleteItem.addActionListener(this);

        edit.addSeparator();

        find = new JMenuItem("查找(F)");
        find.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F, KeyEvent.CTRL_MASK, false));
        edit.add(find);
        find.addActionListener(this);

        replace = new JMenuItem("替换(R)");
        replace.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_H, KeyEvent.CTRL_MASK, false));
        edit.add(replace);
        replace.addActionListener(this);

        edit.addSeparator();

        selectall = new JMenuItem("全选(A)");
        selectall.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, KeyEvent.CTRL_MASK, false));
        edit.add(selectall);
        selectall.addActionListener(this);

        time_date = new JMenuItem("时间/日期(D)");
        edit.add(time_date);
        time_date.addActionListener(this);

        style = new JMenu("设置(S)");
        menubar.add(style);

        enter = new JCheckBoxMenuItem("自动换行(W)");
        enter.setState(true);
        style.add(enter);
        enter.addItemListener(this);

        font = new JMenuItem("字体格式(F)...");
        font.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, KeyEvent.CTRL_MASK, false));
        style.add(font);
        font.addActionListener(this);

        style.addSeparator();

        musicpanel.setLayout(new BorderLayout());
        music = new JMusic(musicpanel);
        bkmusic = new JMenu("背景音乐(M)");
        style.add(bkmusic);
        bkmusic.add(musicImport);
        musicImport.addActionListener(this);
        bkmusic.add(musicmode);
        for (int i = 0; i < 3; i++) {
            mode[i] = new JRadioButtonMenuItem(modeValues[i]);
            group.add(mode[i]);
            musicmode.add(mode[i]);
            mode[i].addActionListener(this);
        }
        mode[0].setSelected(true);
        bkmusic.add(musiclist);

        int size = music.VdirName.size();
        for (int i = 0; i < size; i++) {
            File file = new File((String) music.VdirName.get(i));
            addMusicfile(file);
        }

        bkcolor = new JMenuItem("背景颜色(B)");
        bkcolor.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_B, KeyEvent.CTRL_MASK, false));
        style.add(bkcolor);
        bkcolor.addActionListener(this);

        style.addSeparator();

        drag = new JCheckBoxMenuItem("支持拖拽文件(D)");
        style.add(drag);
        drag.setState(true);
        drag.addItemListener(this);

        view = new JMenu("查看(V)");
        menubar.add(view);

        tool = new JCheckBoxMenuItem("工具栏");
        view.add(tool);
        tool.setState(false);
        tool.addItemListener(this);

        about = new JMenu("关于(A)");
        menubar.add(about);

        info = new JMenuItem("关于记事本");
        info.addActionListener(this);
        about.add(info);

        popmenu.add(popundoItem);
        popundoItem.addActionListener(this);
        popmenu.add(popredoItem);
        popredoItem.addActionListener(this);
        popmenu.addSeparator();
        popmenu.add(popcutItem);
        popcutItem.addActionListener(this);
        popmenu.add(popcopyItem);
        popcopyItem.addActionListener(this);
        popmenu.add(poppasteItem);
        poppasteItem.addActionListener(this);
        popmenu.add(popdeleteItem);
        popdeleteItem.addActionListener(this);
        popmenu.addSeparator();
        popmenu.add(popselectall);
        popselectall.addActionListener(this);
        text.addMouseListener(new MouseAdapter() {

            @Override
            public void mouseReleased(MouseEvent e) {
                if (e.isPopupTrigger()) {
                    popmenu.show(text, e.getX(), e.getY());
                }
            }
        });

        this.setSize(750, 650);
        //设定窗体出现在屏幕的正中
        //获取屏幕的大小先...
        Dimension scrnDim = Toolkit.getDefaultToolkit().getScreenSize();
        //计算本窗体的起始位置
        int x = (scrnDim.width - this.getSize().width) / 2;
        int y = (scrnDim.height - this.getSize().height) / 2;

        this.setLocation(x, y);
        this.add(musicpanel, BorderLayout.SOUTH);
        this.add(scroll, BorderLayout.CENTER);
        this.thread.start();
        this.setVisible(true);

    }

    public int decide() throws IOException {
        newContent = text.getText();
        if (!oldContent.equals(newContent)) {
            int decision = JOptionPane.showConfirmDialog(this,
                    currentFile.getPath() + "文件的内容已经改变!\n" + "想保存文件吗?",
                    "记事本",
                    JOptionPane.YES_NO_CANCEL_OPTION,
                    JOptionPane.WARNING_MESSAGE);
            return decision;
        }
        return JOptionPane.NO_OPTION;
    }

    public void newFile() throws IOException {
        int decision = decide();
        if (decision == JOptionPane.YES_OPTION) {
            if (check()) {
                saveFile();
            } else {
                saveAs();
            }
        } else if (decision == JOptionPane.CANCEL_OPTION) {
            return;
        }

        this.setTitle("无标题-记事本   Time@");
        text.setText("");
        oldContent = newContent = "";
    }

    public void openFile() throws IOException {
        int decision = decide();
        if (decision == JOptionPane.YES_OPTION) {
            if (check()) {
                saveFile();
            } else {
                saveAs();
            }
        } else if (decision == JOptionPane.CANCEL_OPTION) {
            return;
        }

        JFileChooser openDialog = new JFileChooser();
        openDialog.setCurrentDirectory(currentFile);
        openDialog.setFileFilter(new javax.swing.filechooser.FileFilter() {

            public boolean accept(File f) {
                return f.getName().toLowerCase().endsWith(".txt") || f.isDirectory();
            }

            public String getDescription() {
                return "文本文档(*.txt)";
            }
        });

        int Y_N = openDialog.showOpenDialog(this);
        if (Y_N == JFileChooser.CANCEL_OPTION) {
            return;
        }

        File file = openDialog.getSelectedFile();
        if (file == null) {
            return;
        }
        text.setText("");
        currentFile = file;
        title = currentFile.getName();
        this.setTitle(title + "-记事本   Time@");
        try {
            BufferedReader read = new BufferedReader(new FileReader(currentFile.getPath()));
            String oneline = null;
            oldContent = "";
            do {
                oneline = read.readLine();
                if (oneline != null) {
                    text.append(oneline + "\n");//text.append(oneline + "\n");
                }
            } while (oneline != null);
            text.setSelectionEnd(0);
            oldContent = text.getText();
            text.setSelectionStart(0);
            text.setSelectionEnd(0);
            read.close();
        } catch (Exception ex) {
        }
        addRecentfiles(currentFile.getPath());
    }

    public void saveFile() throws IOException {
        try {
            BufferedWriter writer = new BufferedWriter(new FileWriter(currentFile.getPath()));
            String content = "";
            content = text.getText();
            writer.write(content);
            writer.flush();
            writer.close();
            oldContent = newContent = text.getText();
        } catch (Exception e2) {
        }
    }

    public void saveAs() throws IOException {
        try {
            JFileChooser saveAs = new JFileChooser();
            saveAs.setCurrentDirectory(currentFile);
            saveAs.setSelectedFile(currentFile);
            saveAs.setFileFilter(new javax.swing.filechooser.FileFilter() {

                public boolean accept(File f) {
                    return f.getName().toLowerCase().endsWith(".txt") || f.isDirectory();
                }

                public String getDescription() {
                    return "文本文档(*.txt)";
                }
            });
            int Y_N = saveAs.showSaveDialog(this);
            if (Y_N == JFileChooser.CANCEL_OPTION) {
                return;
            }
            File file = new File("");
            file = saveAs.getSelectedFile();
            BufferedWriter writer = new BufferedWriter(new FileWriter(file.getPath()));
            String content = "";
            do {
                content = text.getText();
                writer.write(content);
                writer.close();
            } while (content != null);
        } catch (Exception e2) {
        }
    }

    public void exit() throws IOException {
        newContent = text.getText();
        if (!oldContent.equals(newContent)) {
            int decision = JOptionPane.showConfirmDialog(this,
                    currentFile.getPath() + "文件的内容已经改变!\n" + "想保存文件吗?",
                    "记事本",
                    JOptionPane.YES_NO_OPTION,
                    JOptionPane.WARNING_MESSAGE);
            if (decision == JOptionPane.YES_OPTION) {
                saveAs();
            }
        }
        thread.stop();
        music.saveMusiclist();
        System.exit(0);
    }

    private void cut() {
        clipboard.setData(text.getSelectedText());
        text.replaceRange("", text.getSelectionStart(), text.getSelectionEnd());