Java记事本-可以参考

import java.awt.*;import java.awt.event.*;import java.text.*;import java.util.*;import java.io.*;import javax.swing.*;import javax.swing.event.*;import java.util.List;public class TextFileEditorJFrame extends JFrame implements ActionListener,ItemListener,MouseListener{private File file; //当前文件//---文件菜单，定义的添加项，新建，打开，保存，另存为，退出------//private JMenuItem menuitem_create,menuitem_open,menuitem_save,menuitem_saveas,menuitem_exit;//---编辑菜单，定义的添加项，剪切，复制，粘贴，删除-------//private JMenuItem menuitem_cut, menuitem_copy,menuitem_paste,menuitem_delete;//----右键菜单项，剪切，复制，粘贴，删除----//private JMenuItem final_cut,final_copy,final_paste,final_delete;private JTextArea textarea; //文本编辑区private JButton button_color; //设置颜色private JScrollPane scroll; //为文本编辑区提供滚动条private JDialog dialog1,dialog2; //对话框private JLabel label_dialog,label_dialog2;private Boolean via=false;private JPopupMenu popupmenu; //右键弹出菜单private JCheckBoxMenuItem checkbox_cuti, checkbox_xieti; //复选框表示粗体、斜体private String fileName=null; //文件名private int k = 0; //k用来存放字号大小private String size = "宋体";private JComboBox jco1,jco2; //工具栏处表示字体，字号组合框File currentFile,saveFileName = null, fileName1 = null; //文件类public TextFileEditorJFrame() //空文件的构造方法，初始化{super("文本编辑器"); //框架的标题this.setSize(700,500);this.setLocation(140,140); //相对界面的位置this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);textarea = new JTextArea("");textarea.addMouseListener(this);this.add(textarea); //添加文本区this.addMenu(); //调用自定义的addMenu()方法，添加菜单栏this.addToolBar(); //调用自定义的addToolBar（）方法，添加工具栏textarea.setFont(new Font("宋体",1,16)); //设置文本区初始字体this.setV isible(true);textarea.requestFocus(); //设置文本区焦聚this.file = null; //空文件对象}public TextFileEditorJFrame(String filename) //指定文件名的构造方法//即打开文件后显示文件内容{this();if (filename!=null){this.file = new File(filename);this.setTitle(filename); //将文件名添加在窗口标题栏上this.textarea.setText(this.readFromFile()); //读取指定文件中的字符串，并显示在文本区中}}public TextFileEditorJFrame(File file) //指定文件对象的构造方法,{ //通过文件对象调用函数得到文件名，从而读取文件内容this();if (file!=null){this.file = file;this.setTitle(this.file.getName()); //把标题设置成得到的文件名，通过文件对象调用函数得到文件名this.textarea.setText(this.readFromFile()); //调用readFromFile()方法，把读取的内容在文本区显示}}private void addMenu() //添加主菜单{JMenuBar menubar = new JMenuBar(); //创建菜单栏this.setJMenuBar(menubar); //将菜单条设置为当前窗口的菜单条//-----------------------------------------文件菜单----------------------------------------------JMenu menu_file = new JMenu("文件");menubar.add(menu_file); //创建文件菜单，并添加到菜单栏menuitem_create = new JMenuItem("新建(N)"); //创建新建菜单项menuitem_create.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,ActionEvent.CTRL_MASK)); //为新建设置快捷键Ctrl+Nmenu_file.add(menuitem_create); //添加到文件菜单menuitem_create.addActionListener(this);menuitem_open = new JMenuItem("打开(O)"); //创建打开菜单项menuitem_open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,ActionEvent.CTRL_MASK)); //为打开设置快捷键Ctrl+Omenu_file.add(menuitem_open); //添加到文件菜单menuitem_open.addActionListener(this);menuitem_save = new JMenuItem("保存(S)");//创建保存菜单项menuitem_save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,ActionEvent.CTRL_MASK));//为保存设置快捷键Ctrl+Smenu_file.add(menuitem_save); //添加到文件菜单menuitem_save.addActionListener(this);menuitem_saveas = new JMenuItem("另存为(F12)");//创建另存为菜单项menuitem_saveas.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F12,ActionEvent.CTRL_MASK));//为另存为设置快捷键Ctrl+F12menu_file.add(menuitem_saveas); //添加到文件菜单menuitem_saveas.addActionListener(this);menu_file.addSeparator(); //在菜单中添加分隔线，将菜单项进行分组menuitem_exit = new JMenuItem("退出(E)");//创建退出菜单项menuitem_exit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E,ActionEvent.ALT_MASK));//为退出设置快捷键Ctrl+Emenu_file.add(menuitem_exit);//添加到文件菜单menuitem_exit.addActionListener(this);//-----------------------------------------编辑菜单---------------------------------------------JMenu menu_edit = new JMenu("编辑"); //创建编辑菜单，添加到菜单栏menubar.add(menu_edit);menuitem_cut = new JMenuItem("剪切(X)");//创建剪切菜单项，并添加到编辑菜单中menuitem_cut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,ActionEvent.CTRL _MASK));//设置快捷键Ctrl+Xmenu_edit.add(menuitem_cut);menuitem_cut.addActionListener(this);menuitem_copy = new JMenuItem("复制(C)");//在编辑菜单中添加复制菜单项menuitem_copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,ActionEvent.CTRL_M ASK));//设置快捷键Ctrl+Cmenu_edit.add(menuitem_copy);menuitem_copy.addActionListener(this);menuitem_paste = new JMenuItem("粘贴(V)");//创建粘贴menuitem_paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,ActionEvent.CTRL_M ASK));//设置快捷键Ctrl+Vmenu_edit.add(menuitem_paste);menuitem_paste.addActionListener(this);menuitem_delete = new JMenuItem("删除(D)");//创建删除menuitem_delete.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_D,ActionEvent.CTRL_ MASK));//设置快捷键Ctrl+Dmenu_edit.add(menuitem_delete);menuitem_delete.addActionListener(this);menu_edit.addActionListener(new ActionListener() // 注册事件监听{public void actionPerformed(ActionEvent e) {checkMenuItemEnabled(); // 设置剪切、复制、粘贴、删除等功能的可用性}});menu_edit.addSeparator(); //设置分隔线//-----------------------------------------格式菜单----------------------------------------------JMenu menu_style = new JMenu("格式"); //在菜单栏中创建格式菜单menubar.add(menu_style);JMenu menu_ziti = new JMenu("字体"); //添加字体项checkbox_cuti=new JCheckBoxMenuItem("粗体");checkbox_xieti=new JCheckBoxMenuItem("斜体");checkbox_cuti.addItemListener(this);checkbox_xieti.addItemListener(this);menu_ziti.add(checkbox_cuti); //粗体，斜体复选菜单添加到字体项中menu_ziti.add(checkbox_xieti);menu_style.add(menu_ziti);JMenuItem menu_color = new JMenuItem("颜色"); //添加颜色项menu_style.add(menu_color);menu_color.addActionListener(this);//-----------------------------------------帮助菜单----------------------------------------------JMenu menu_help = new JMenu("帮助"); //创建帮助菜单menubar.add(menu_help);JMenuItem menu_look = new JMenuItem("查看帮助(L)"); //帮助菜单中添加帮助查看项menu_help.add(menu_look);menu_look.addActionListener(this);JMenuItem menu_about = new JMenuItem("关于文本(A)");//添加关于文本项menu_help.add(menu_about);menu_about.addActionListener(this);dialog1 = new JDialog(this,"关于文本"); //单击关于文本，弹出对话框dialog1.setSize(480,150);label_dialog = new JLabel("---作者：郑健健，制作时间：2013,1,8------",JLabel.CENTER);dialog1.add(label_dialog);dialog1.setDefaultCloseOperation(HIDE_ON_CLOSE);dialog2 = new JDialog(this,"帮助文档");//单击查看帮助，弹出对话框dialog2.setSize(500,220);label_dialog2 = new JLabel("---------欢迎使用记事本--------",JLabel.CENTER);dialog2.add(label_dialog2);dialog2.setDefaultCloseOperation(HIDE_ON_CLOSE);//----------------------------------------------右键弹出菜单对象--------------------------------------------------------popupmenu = new JPopupMenu();final_cut = new JMenuItem("剪切(X)"); //final_cut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK));//设置快捷键Ctrl+Xpopupmenu.add(final_cut); //添加剪切final_cut.addActionListener(this);final_copy = new JMenuItem("复制(C)");final_copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK)) ;//设置快捷键Ctrl+Cpopupmenu.add(final_copy); //添加复制final_copy.addActionListener(this);final_paste = new JMenuItem("粘贴(V)");final_paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK)) ;//设置快捷键Ctrl+Vpopupmenu.add(final_paste); //添加粘贴final_paste.addActionListener(this);final_delete = new JMenuItem("删除(D)");final_delete.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_D,InputEvent.CTRL_MASK) );//设置快捷键Ctrl+Dpopupmenu.add(final_delete); //添加删除final_delete.addActionListener(this);textarea.add(popupmenu);// --------------------文本编辑区注册右键菜单事件-----------//textarea.addMouseListener(new MouseAdapter() {public void mousePressed(MouseEvent e) {checkForTriggerEvent(e);}public void mouseReleased(MouseEvent e) {checkForTriggerEvent(e);}private void checkForTriggerEvent(MouseEvent e) {if (e.isPopupTrigger()){popupmenu.show(e.getComponent(), e.getX(), e.getY());// X、Y// 显示弹出菜单}// 在组件调用者的坐标空间中的位置checkMenuItemEnabled(); // 设置剪切、复制、粘贴、删除等功能的可用性textarea.requestFocus(); // 编辑区获取焦点}});Container container = getContentPane(); //创建滚动条container.setLayout(new BorderLayout() );scroll = new JScrollPane( textarea,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_ALW AYS );container.add( scroll, BorderLayout.CENTER );}private void addToolBar(){//------------------------设置工具栏---------------------------------//JToolBar jto=new JToolBar(); //创建工具栏jto.setBackground(Color.black); //设置工具栏背景颜色JButton btziti=new JButton("字体");jto.add(btziti); //添加显示字体的按钮Stringob1[]=GraphicsEnvironment.getLocalGraphicsEnvironment().getA vailableFontFamilyNames();//字体组合框数据项String ob2[]={"10","12","14","16","18","20","24","28","32","36","48","72"};//字号组合框数据项jco1=new JComboBox(ob1);//两个组合框：字体，字号大小jco2=new JComboBox(ob2);jco1.addActionListener(this);jco2.addActionListener(this);jto.add(jco1); //工具栏里面添加：字体，字号组合框jto.add(jco2);this.add(jto,BorderLayout.NORTH);//添加工具栏}public void checkMenuItemEnabled(){String selectText = textarea.getSelectedText();if (selectText == null){ //如果没有选择文本，剪切，删除，复制功能不可用menuitem_cut.setEnabled(false);final_cut.setEnabled(false);menuitem_copy.setEnabled(false);final_copy.setEnabled(false);menuitem_delete.setEnabled(false);final_delete.setEnabled(false);}else{ //选择了文本，剪切，删除，复制功能可用menuitem_cut.setEnabled(true);final_cut.setEnabled(true);menuitem_copy.setEnabled(true);final_copy.setEnabled(true);menuitem_delete.setEnabled(true);final_delete.setEnabled(true);}}public String readFromFile() //使用流从指定文本文件中读取字符串{try{FileReader fin = new FileReader(this.file); //以文件对象作为文件名来读取文件BufferedReader bin = new BufferedReader(fin); //设置缓冲区，将读到的字符串暂存在缓冲区String aline="", lines="";do{aline = bin.readLine(); //读取一行字符串，抵达文件结尾时返回nullif (aline!=null)lines += aline + "\r\n";} while (aline!=null); //文件不为空一直读取bin.close(); //读取后关闭文件，释放缓冲区fin.close();return lines;}catch (IOException ioex){return null; //出现异常，返回空}}public boolean openDialog() //执行打开文件对话框{ //在打开文件对话框中，单击【打开】按钮时返回true，单击【取消】按钮时返回false FileDialog filedialog = new FileDialog(this,"打开",FileDialog.LOAD); //创建打开文件对话框filedialog.setVisible(true); //显示打开文件对话框if ((filedialog.getDirectory()!=null) && (filedialog.getFile()!=null)) //单击【打开】按钮时，文件路径不为空，文件名不为空{this.file = new File(filedialog.getDirectory(), filedialog.getFile());return true;}elsereturn false; //单击【取消】按钮时}public void fileSaveAs(){JFileChooser jFileChooser=new JFileChooser();if(JFileChooser.APPROVE_OPTION==jFileChooser.showSaveDialog(this))//打开保存对话框，选择yes or no{fileName=(jFileChooser.getSelectedFile()+".txt");//文件名称赋给fileNamefileSave(); //fileName不为空，调用保存函数，对文件进行另存}}public void fileSave(){if(fileName==null){fileSaveAs();}else{if(!via){if(fileName.length()!=0){try{File saveFile=new File(fileName);FileWriter fw=new FileWriter(saveFile);fw.write(textarea.getText()); //文本内容输出fw.close();via=true;this.setTitle(fileName.substring(stIndexOf("\\")+1));this.repaint();}catch(Exception e){JOptionPane.showMessageDialog(this,"保存文件时出错","错误",JOptionPane.ERROR_MESSAGE);//提示错误}}else{fileSaveAs();}}}}public void chooseColor(){Color bcolor=textarea.getForeground();JColorChooser jColor=new JColorChooser();jColor.setColor(bcolor);textarea.setForeground(JColorChooser.showDialog(textarea,"选择颜色",bcolor));}public void actionPerformed(ActionEvent e) //单击事件处理程序{if (e.getActionCommand()=="新建(N)") //单击新建时，弹出提示框，文件是否保存{textarea.replaceRange("", 0, textarea.getText().length());this.setTitle("无标题- 记事本");}if(e.getActionCommand()=="打开(O)") //单击打开时，弹出对话框{if (this.openDialog()) //打开文件对话框并单击【打开】按钮时执行，单击【取消】按钮时不执行{this.setTitle(this.file.getName()); //取得文件名，作为标题this.textarea.setText(this.readFromFile());//调用读函数，把文件读出，显示到文本区}}if(e.getActionCommand()=="保存(S)" ) //非第1次保存时，只保存不需要打开保存文件对话框{this.fileSave();}if((e.getActionCommand()=="保存(S)" && this.file==null) || e.getActionCommand()=="另存为(F12)"){ //第1次保存或执行"另存为"菜单时，需要打开保存文件对话框this.fileSaveAs();}if (e.getSource() == menuitem_exit) {int exitChoose = JOptionPane.showConfirmDialog(this, "确定要退出吗？", "退出提示", JOptionPane.OK_CANCEL_OPTION);if (exitChoose == JOptionPane.OK_OPTION) {System.exit(0);} else {return;}}if(e.getActionCommand()=="剪切(T)")textarea.cut();if(e.getActionCommand()=="复制(C)")textarea.copy();if(e.getActionCommand()=="粘贴(V)")textarea.paste();if(e.getActionCommand()=="删除(D)"){textarea.replaceRange("",textarea.getSelectionStart(),textarea.getSelectionEnd());via=false;}if(e.getActionCommand()=="颜色"){chooseColor();}if(e.getActionCommand() == "查看帮助(L)"){dialog2.setLocation(250,330);dialog2.setVisible(true);}if(e.getActionCommand() == "关于文本(A)"){dialog1.setLocation(250,330);dialog1.setVisible(true);}int style=textarea.getFont().getStyle();if(e.getSource()==jco1||e.getSource()== jco2)//字体和字号组合框的实现{size=(String) jco1.getSelectedItem();k=Integer.parseInt(jco2.getSelectedItem().toString());textarea.setFont(new Font(size,Font.PLAIN,k));}}public void itemStateChanged(ItemEvent e) //复选框选择事件处理程序{ //实现ItemListener接口中的方法Font font = textarea.getFont();int style = font.getStyle();if (e.getSource()==checkbox_cuti)style = style ^ 1; //整数的位运算，异或^if (e.getSource()==checkbox_xieti)style = style ^ 2;textarea.setFont(new Font(font.getName(),style,font.getSize()));}public void mouseClicked(MouseEvent mec) //单击鼠标时触发{ //实现MouseListener接口中的方法if (mec.getModifiers()==mec.BUTTON3_MASK) //单击的是鼠标右键popupmenu.show(textarea,mec.getX(),mec.getY()); //在鼠标单击处显示快捷菜单}public void mousePressed(MouseEvent mep) { }public void mouseReleased(MouseEvent mer) { }public void mouseEntered(MouseEvent mee) { }public void mouseExited(MouseEvent mex) { }public void mouseDragged(MouseEvent med) { }public static void main(String arg[]){new TextFileEditorJFrame();}}。