Java程序编写记事本方法大全

Java语言可以实现很多程序，那么用java怎么编写记事本呢?下面跟本站小编一起来看看吧!

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.io.*;

public class Notepad extends JFrame {

// 系统组件声明

private JMenuBar menuBar = new JMenuBar();

private JEditorPane content = new JEditorPane();

private JScrollPane scroll = new JScrollPane(content);

private JFileChooser filechooser = new JFileChooser() ;

private BorderLayout bord = new BorderLayout();

private JLabel statusBar = new JLabel();

private JPanel pane = new JPanel();

private File file = null;

// 定义文件菜单

private JMenu fileMenu = new JMenu();

private JMenUItem newMenuItem = new JMenuItem();

private JMenuItem openMenuItem = new JMenuItem();

private JMenuItem saveMenuItem = new JMenuItem();

private JMenuItem saveAsMenuItem = new JMenuItem();

private JMenuItem pageSetupMenuItem = new JMenuItem();

private JMenuItem printMenuItem = new JMenuItem();

private JMenuItem exitMenuItem = new JMenuItem();

// 定义风格菜单

private JMenu styleMenu = new JMenu();

private ButtonGroup styleMenuGroup = new ButtonGroup();

private JRadioButtonMenuItem javaStyleMenuItem = new JRadioButtonMenuItem();

private JRadioButtonMenuItem metalStyleMenuItem = new JRadioButtonMenuItem();

private JRadioButtonMenuItem windowsStyleMenuItem = new JRadioButtonMenuItem();

// 定义帮助菜单

private JMenuItem aboutMenuItem = new JMenuItem();

private JMenuItem helpTopicMenuItem = new JMenuItem();

private JMenu helpMenu = new JMenu();

// 构造函数

public Notepad(){

initComponents();

}

private void initComponents(){

// 添加子菜单项到文件菜单

fileMenu.setText("/u6587/u4ef6 (F)");

newMenuItem.setText(" 新建(N) Ctrl+N");

openMenuItem.setText(" 打开(O)... Ctrl+O");

saveMenuItem.setText(" 保存(S) Ctrl+S");

saveAsMenuItem.setText(" 另存为(A)...");

pageSetupMenuItem.setText(" 页面设置(U)...");

printMenuItem.setText(" 打印(P)... Ctrl+P");

exitMenuItem.setText(" 退出");

fileMenu.add(newMenuItem);

fileMenu.add(openMenuItem);

fileMenu.add(saveMenuItem);

fileMenu.add(saveAsMenuItem);

fileMenu.addSeparator();

fileMenu.add(pageSetupMenuItem);

fileMenu.add(printMenuItem);

fileMenu.addSeparator();

fileMenu.add(exitMenuItem);

// 添加子菜单项到风格菜单

styleMenu.setText("风格(S)");

javaStyleMenuItem.setText("Java默认");

metalStyleMenuItem.setText("Metal风格");

windowsStyleMenuItem.setText("Windows风格");

styleMenuGroup.add(javaStyleMenuItem);

styleMenuGroup.add(metalStyleMenuItem);

styleMenuGroup.add(windowsStyleMenuItem);

styleMenu.add(javaStyleMenuItem);

styleMenu.add(metalStyleMenuItem);

styleMenu.add(windowsStyleMenuItem);

// 添加子菜单项到帮助菜单

helpMenu.setText("帮助(H)");

helpTopicMenuItem.setText(" 帮助主题(H)");

aboutMenuItem.setText(" 关于记事本(A)");

helpMenu.add(helpTopicMenuItem);

helpMenu.addSeparator();

helpMenu.add(aboutMenuItem);

// 定义文件菜单下的事件监听

newMenuItem.addActionListener(new newMenuItem_actionAdapter(this));

openMenuItem.addActionListener(new openMenuItem_actionAdapter(this));

saveMenuItem.addActionListener(new saveMenuItem_actionAdapter(this));

saveAsMenuItem.addActionListener(new saveAsMenuItem_actionAdapter(this));

pageSetupMenuItem.addActionListener(new pageSetupMenuItem_actionAdapter(this));

printMenuItem.addActionListener(new printMenuItem_actionAdapter(this));

exitMenuItem.addActionListener(new exitMenuItem_actionAdapter(this));

// 定义风格菜单下的事件监听

javaStyleMenuItem.addActionListener(new javaStyleMenuItem_actionAdapter(this));

metalStyleMenuItem.addActionListener(new metalStyleMenuItem_actionAdapter(this));

windowsStyleMenuItem.addActionListener(new windowsStyleMenuItem_actionAdapter(this));

// 定义帮助菜单下的事件监听

helpTopicMenuItem.addActionListener(new helpTopicMenuItem_actionAdapter(this));

aboutMenuItem.addActionListener(new aboutMenuItem_actionAdapter(this));

// 填加菜单到菜单栏

menuBar.add(fileMenu);

menuBar.add(styleMenu);

menuBar.add(helpMenu);

// 对主窗口的.一些设置

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

this.setTitle("无标题 - /u8bb0/u4e8b/u672c");

this.setSize(640,480);

setJMenuBar(menuBar);

pane.setLayout(bord);

pane.add("Center",scroll);

setContentPane(pane);

}

// 定义新建菜单项方法

public void newMenuItemActionPerformed(ActionEvent evt){

file = null;

if(!("".equals(content.getText()))){

Object[] options = { " 是(Y) ", " 否(N) "," 取消 " };

int s = JOptionPane.showOptionDialog(null, "/u6587/u4ef6 "+getTitle()+" /u7684/u6587/u5b57/u5df2/u7ecf/u6539/u53d8/u3002/n/u60f3/u4fdd/u5b58/u6587/u4ef6/u5417/uff1f", "/u8bb0/u4e8b/u672c",

JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE,

null, options, options[0]);

switch(s){

case 0:

int returnVal=filechooser.showSaveDialog(this);

if(returnVal == JFileChooser.APPROVE_OPTION) {

file=filechooser.getSelectedFile();

try{

FileWriter fw=new FileWriter(file);

fw.write(content.getText());

setTitle(filechooser.getSelectedFile().getName()+" - /u8bb0/u4e8b/u672c");

fw.close();

}

catch(Exception e){

e.printStackTrace();

}

break;

}

case 1:

content.setText("");

setTitle("无标题 - /u8bb0/u4e8b/u672c");

}

}

}

// 定义打开菜单项方法

public void openMenuItemActionPerformed(ActionEvent evt){

try {

file = null;

int returnVal = filechooser.showOpenDialog(this);

if(returnVal == JFileChooser.APPROVE_OPTION){

file = filechooser.getSelectedFile();

FileReader fr = new FileReader(file);

int len = (int)file.length();

char[] buffer = new char[len];

fr.read(buffer,0,len);

fr.close();

content.setText(new String(buffer));

}

}

catch(Exception e){

e.printStackTrace();

}

}

// 定义退出菜单项方法

public void exitMenuItem_actionPerformed(ActionEvent e){

if(!("".equals(content.getText()))){

Object[] options = { " 是(Y) ", " 否(N) "," 取消 " };

int s = JOptionPane.showOptionDialog(null, "文件的文字已经改变。/n想保存文件吗?", "/u8bb0/u4e8b/u672c",

JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE,

null, options, options[0]);

switch(s){

case 0:

int returnVal=filechooser.showSaveDialog(this);

if(returnVal == JFileChooser.APPROVE_OPTION) {

file=filechooser.getSelectedFile();

try{

FileWriter fw=new FileWriter(file);

fw.write(content.getText());

setTitle(filechooser.getSelectedFile().getName()+" - /u8bb0/u4e8b/u672c");

fw.close();

}

catch(Exception ex){

ex.printStackTrace();

}

break;

}

case 1:

System.exit(0);

}

}

else{

System.exit(0);

}

}

// 保存事件

public void saveMenuItemActionPerformed(ActionEvent evt){

int returnVal=filechooser.showSaveDialog(this);

if(returnVal == JFileChooser.APPROVE_OPTION) {

file=filechooser.getSelectedFile();

try{

FileWriter fw=new FileWriter(file);

fw.write(content.getText());

setTitle(filechooser.getSelectedFile().getName()+" - /u8bb0/u4e8b/u672c");

fw.close();

}

catch(Exception e){

e.printStackTrace();

}

}

}

// 另存为事件

public void saveAsMenuItemActionPerformed(ActionEvent evt){

filechooser.setDialogTitle("另存为...");

int returnVal = filechooser.showSaveDialog(this);

if(returnVal == JFileChooser.APPROVE_OPTION) {

file=filechooser.getSelectedFile();

try{

FileWriter fw=new FileWriter(file);

fw.write(content.getText());

setTitle(filechooser.getSelectedFile().getName()+" - /u8bb0/u4e8b/u672c");

fw.close();

}

catch(Exception e){

e.printStackTrace();

}

}

}

// 页面设置事件

public void pageSetupMenuItemActionPerformed(ActionEvent evt){

JOptionPane.showMessageDialog(null,"此功能正在开发中...");

}

// 打印事件

public void printMenuItemActionPerformed(ActionEvent evt){

JOptionPane.showMessageDialog(null,"打印中...");

}

// 更新风格外观方法

void changeLookFeel(String className) {

try {

UIManager.setLookAndFeel(className);

}

catch (Exception e) {

System.out.println(e);

}

SwingUtilities.updateComponentTreeUI(this);

}

// Java风格事件

public void javaStyleMenuItemActionPerformed(ActionEvent evt){

changeLookFeel("javax.swing.plaf.metal.MetalLookAndFeel");

}

// Motif风格事件

public void metalStyleMenuItemActionPerformed(ActionEvent evt){

changeLookFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");

}

// MAC风格事件

public void windowsStyleMenuItemActionPerformed(ActionEvent evt){

changeLookFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");

}

// 帮助事件

public void helpTopicMenuItemActionPerformed(ActionEvent evt){

JOptionPane.showMessageDialog(null,"/u9700/u8981/u5e2e/u52a9/u5417/uff1f");

}

// 关于事件

public void aboutMenuItemActionPerformed(ActionEvent evt){

JOptionPane.showMessageDialog(null,"/n/u7a0b/u5e8f/u540d/u79f0/uff1aJava /u8bb0/u4e8b/u672c/n/u4ee3/u7801/u7f16/u5199/uff1aCavien/n/u4f5c/u8005/u7f51/u7ad9/uff1ahttp:/www.cavien.com/nE-mail/u3000/[email protected]");

}

// 主函数

public static void main(String args[]) {

Notepad notepad = new Notepad();

notepad.setVisible(true);

}

}

// 定义新建事件类

class newMenuItem_actionAdapter implements ActionListener{

Notepad adaptee;

newMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.newMenuItemActionPerformed(evt);

}

}

// 定义打开事件类

class openMenuItem_actionAdapter implements ActionListener{

Notepad adaptee;

openMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.openMenuItemActionPerformed(evt);

}

}

// 定义保存事件类

class saveMenuItem_actionAdapter implements ActionListener{

Notepad adaptee;

saveMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.saveMenuItemActionPerformed(evt);

}

}

// 定义另存为事件类

class saveAsMenuItem_actionAdapter implements ActionListener{

Notepad adaptee;

saveAsMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.saveAsMenuItemActionPerformed(evt);

}

}

// 定义页面设置事件类

class pageSetupMenuItem_actionAdapter implements ActionListener{

Notepad adaptee;

pageSetupMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.pageSetupMenuItemActionPerformed(evt);

}

}

// 定义打印事件类

class printMenuItem_actionAdapter implements ActionListener{

Notepad adaptee;

printMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.printMenuItemActionPerformed(evt);

}

}

// 定义Java风格事件类

class javaStyleMenuItem_actionAdapter implements ActionListener{

Notepad adaptee;

javaStyleMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.javaStyleMenuItemActionPerformed(evt);

}

}

// 定义Java风格事件类

class metalStyleMenuItem_actionAdapter implements ActionListener{

Notepad adaptee;

metalStyleMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.metalStyleMenuItemActionPerformed(evt);

}

}

// 定义Java风格事件类

class windowsStyleMenuItem_actionAdapter implements ActionListener{

Notepad adaptee;

windowsStyleMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.windowsStyleMenuItemActionPerformed(evt);

}

}

// 定义帮助主题事件类

class helpTopicMenuItem_actionAdapter implements ActionListener{

Notepad adaptee;

helpTopicMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.helpTopicMenuItemActionPerformed(evt);

}

}

// 定义关于软件事件类

class aboutMenuItem_actionAdapter implements ActionListener{

Notepad adaptee;

aboutMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.aboutMenuItemActionPerformed(evt);

}

}

// 定义退出事件类

class exitMenuItem_actionAdapter implements ActionListener {

Notepad adaptee;

exitMenuItem_actionAdapter(Notepad adaptee){

this.adaptee = adaptee;

}

public void actionPerformed(ActionEvent evt){

adaptee.exitMenuItem_actionPerformed(evt);

}