用java写的日历记事本代码？

详细代码

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//CalendarWindow类：

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

import java.io.*;

public class CalendarWindow extends JFrame implements ActionListener,

MouseListener,FocusListener{

int year,month,day;

CalendarMessage calendarMessage;

CalendarPad calendarPad;

NotePad notePad;

JTextField showYear,showMonth;

JTextField [] showDay;

CalendarImage calendarImage;

Clock clock;

JButton nextYear,previousYear,nextMonth,previousMonth;

JButton saveDailyRecord,deleteDailyRecord,readDailyRecord;

File dir;

Color backColor=Color.gray;

public CalendarWindow(){

dir=new File("./dailyRecord");

dir.mkdir();

showDay=new JTextField[42];

for(int i=0;ishowDay.length;i++){

showDay[i]=new JTextField();

showDay[i].setBackground(backColor);

showDay[i].setLayout(new GridLayout(3,3));

showDay[i].addMouseListener(this);

showDay[i].addFocusListener(this);

}

calendarMessage=new CalendarMessage();

calendarPad=new CalendarPad();

notePad=new NotePad();

Calendar calendar=Calendar.getInstance();

calendar.setTime(new Date());

year=calendar.get(Calendar.YEAR);

month=calendar.get(Calendar.MONTH)+1;

day=calendar.get(Calendar.DAY_OF_MONTH);

calendarMessage.setYear(year);

calendarMessage.setMonth(month);

calendarMessage.setDay(day);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.setShowDayTextField(showDay);

notePad.setShowMessage(year,month,day);

calendarPad.showMonthCalendar();

doMark(); //给有日志的号码做标记,见后面的doMark()方法

calendarImage=new CalendarImage();

calendarImage.setImageFile(new File("sea.jpg"));

clock=new Clock();

JSplitPane splitV1=

new JSplitPane(JSplitPane.VERTICAL_SPLIT,calendarPad,calendarImage);

JSplitPane splitV2=

new JSplitPane(JSplitPane.VERTICAL_SPLIT,notePad,clock);

JSplitPane splitH=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,splitV1,splitV2);

add(splitH,BorderLayout.CENTER);

showYear=new JTextField(""+year,6);

showYear.setFont(new Font("TimesRoman",Font.BOLD,12));

showYear.setHorizontalAlignment(JTextField.CENTER);

showMonth=new JTextField(" "+month,4);

showMonth.setFont(new Font("TimesRoman",Font.BOLD,12));

showMonth.setHorizontalAlignment(JTextField.CENTER);

nextYear=new JButton("下年");

previousYear=new JButton("上年");

nextMonth=new JButton("下月");

previousMonth=new JButton("上月");

nextYear.addActionListener(this);

previousYear.addActionListener(this);

nextMonth.addActionListener(this);

previousMonth.addActionListener(this);

showYear.addActionListener(this);

JPanel north=new JPanel();

north.add(previousYear);

north.add(showYear);

north.add(nextYear);

north.add(previousMonth);

north.add(showMonth);

north.add(nextMonth);

add(north,BorderLayout.NORTH);

saveDailyRecord=new JButton("保存日志") ;

deleteDailyRecord=new JButton("删除日志");

readDailyRecord=new JButton("读取日志");

saveDailyRecord.addActionListener(this);

deleteDailyRecord.addActionListener(this);

readDailyRecord.addActionListener(this);

JPanel pSouth=new JPanel();

pSouth.add(saveDailyRecord);

pSouth.add(deleteDailyRecord);

pSouth.add(readDailyRecord);

add(pSouth,BorderLayout.SOUTH);

setVisible(true);//根据参数 b 的值显示或隐藏此 Window

setBounds(60,60,660,480);

validate();//验证此容器及其所有子组件

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //设置用户在此窗体上发起 "close" 时默认执行的操作

}

public void actionPerformed(ActionEvent e){

if(e.getSource()==nextYear){

year++;

showYear.setText(""+year);

calendarMessage.setYear(year);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.showMonthCalendar();

notePad.setShowMessage(year,month,day);

doMark();

}

else if(e.getSource()==previousYear){

year--;

showYear.setText(""+year);

calendarMessage.setYear(year);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.showMonthCalendar();

notePad.setShowMessage(year,month,day);

doMark();

}

else if(e.getSource()==nextMonth){

month++;

if(month12) month=1;

showMonth.setText(" "+month);

calendarMessage.setMonth(month);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.showMonthCalendar();

notePad.setShowMessage(year,month,day);

doMark();

}

else if(e.getSource()==previousMonth){

month--;

if(month1) month=12;

showMonth.setText(" "+month);

calendarMessage.setMonth(month);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.showMonthCalendar();

notePad.setShowMessage(year,month,day);

doMark();

}

else if(e.getSource()==showYear){

String s=showYear.getText().trim();

char a[]=s.toCharArray();

boolean boo=false;

for(int i=0;ia.length;i++)

if(!(Character.isDigit(a[i])))

boo=true;

if(boo==true) //弹出“警告”消息对话框

JOptionPane.showMessageDialog(this,"您输入了非法年份","警告", JOptionPane.WARNING_MESSAGE);

else if(boo==false)

year=Integer.parseInt(s);

showYear.setText(""+year);

calendarMessage.setYear(year);

calendarPad.setCalendarMessage(calendarMessage);

calendarPad.showMonthCalendar();

notePad.setShowMessage(year,month,day);

doMark();

}

else if(e.getSource()==saveDailyRecord){

notePad.save(dir,year,month,day);

doMark();

}

else if(e.getSource()==deleteDailyRecord){

notePad.delete(dir,year,month,day);

doMark();

}

else if(e.getSource()==readDailyRecord)

notePad.read(dir,year,month,day);

}

public void mousePressed(MouseEvent e){

JTextField text=(JTextField)e.getSource();

String str=text.getText().trim();

try{ day=Integer.parseInt(str);

}

catch(NumberFormatException exp){

}

calendarMessage.setDay(day);

notePad.setShowMessage(year,month,day);

}

public void mouseReleased(MouseEvent e){}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mouseClicked(MouseEvent e) {}

public void focusGained(FocusEvent e){

Component com=(Component)e.getSource();

com.setBackground(Color.red);

}

public void focusLost(FocusEvent e){

Component com=(Component)e.getSource();

com.setBackground(backColor);

}

public void doMark(){

for(int i=0;ishowDay.length;i++){

showDay[i].removeAll();

String str=showDay[i].getText().trim();

try{

int n=Integer.parseInt(str);

if(isHaveDailyRecord(n)==true){ //见后面的isHaveDailyRecord()方法

JLabel mess=new JLabel("存");

mess.setFont(new Font("TimesRoman",Font.PLAIN,11));

mess.setForeground(Color.black) ;

showDay[i].add(mess);

} }

catch(Exception exp){}

}

calendarPad.repaint();

calendarPad.validate();

}

public boolean isHaveDailyRecord(int n){

String key=""+year+""+month+""+n;

String [] dayFile=dir.list();

boolean boo=false;

for(int k=0;kdayFile.length;k++){

if(dayFile[k].equals(key+".txt")){

boo=true;

break;

} }

return boo;

}

public static void main(String args[]){

new CalendarWindow();

}

}

//CalendarPad类：

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

public class CalendarPad extends JPanel{

int year,month,day;

CalendarMessage calendarMessage;

JTextField [] showDay;

JLabel title[];

String [] 星期={"SUN/日","MON/一","TUE/二","WED/三","THU/四","FRI/五","SAT/六"};

JPanel north,center;

public CalendarPad(){

setLayout(new BorderLayout());

north=new JPanel();

north.setLayout(new GridLayout(1,7));

center=new JPanel();

center.setLayout(new GridLayout(6,7));

add(center,BorderLayout.CENTER);

add(north,BorderLayout.NORTH);

title=new JLabel[7];

for(int j=0;j7;j++){

title[j]=new JLabel();

title[j].setFont(new Font("TimesRoman",Font.BOLD,12));

title[j].setText(星期[j]);

title[j].setHorizontalAlignment(JLabel.CENTER);

title[j].setBorder(BorderFactory.createRaisedBevelBorder());

north.add(title[j]);

}

title[0].setForeground(Color.red);

title[6].setForeground(Color.blue);

}

public void setShowDayTextField(JTextField [] text){

showDay=text;

for(int i=0;ishowDay.length;i++){

showDay[i].setFont(new Font("TimesRoman",Font.BOLD,15));

showDay[i].setHorizontalAlignment(JTextField.CENTER);

showDay[i].setEditable(false);

center.add(showDay[i]);

}

}

public void setCalendarMessage(CalendarMessage calendarMessage){

this.calendarMessage=calendarMessage;

}

public void showMonthCalendar(){

String [] a=calendarMessage.getMonthCalendar();

for(int i=0;i42;i++)

showDay[i].setText(a[i]);

validate();

}

}

用java编写一个“我的日记”的界面并使其实现写日记的功能， 最好含有登陆界面的

代码如下，自己测试哦

import java.awt.event.ActionListener;

import javax.swing.*;

import java.awt.*;

import java.awt.Color;

import java.awt.event.ActionEvent;

import javax.swing.tree.*;

import javax.swing.event.*;

import java.io.*;

import java.util.*;

import javax.swing.JColorChooser;

class Diary extends JFrame implements ActionListener,TreeSelectionListener{

JMenuBar menubar;

JMenu menu1,menu2,menu3,menu4,menu5,menu6;

JMenuItem item1,item2,item3,item4,item5,item6,item7,item8,item52,item61,item62,item63,item64;

JTextArea text=new JTextArea(20,40);

JButton b_save=new JButton("保存日志");

JButton b_del=new JButton("删除日志");

JButton b3=new JButton("锁定日志");

JButton b4=new JButton("解除锁定");

JSplitPane split1,split2;

JScrollPane scroll1,scroll2;

JPanel p;

JTree tree=null;

int i=0;

DefaultMutableTreeNode root;

DefaultMutableTreeNode month[]=new DefaultMutableTreeNode[13];

Diary(){

final JFrame frame = this;

menubar=new JMenuBar();

menu4=new JMenu("登陆");

item6=new JMenuItem("密码登陆");

menu4.add(item6);

menubar.add(menu4);

menu1=new JMenu("文件");

item1=new JMenuItem("新建");

item2=new JMenuItem("退出");

menu1.add(item1);

menu1.add(item2);

menubar.add(menu1);

menu2=new JMenu("编辑");

item3=new JMenuItem("复制");

item4=new JMenuItem("剪切");

item5=new JMenuItem("粘贴");

item52=new JMenuItem("全选");

menu2.add(item3);

menu2.add(item4);

menu2.add(item5);

menu2.add(item52);

menubar.add(menu2);

menu3=new JMenu("设置");

//item6=new JMenuItem("密码设置");

item63=new JMenuItem("设置字体颜色");

item64=new JMenuItem("设置背景颜色");

item61=new JMenuItem("锁定编辑区");

item62=new JMenuItem("解除锁定");

//menu3.add(item6);

menu3.add(item63);

menu3.add(item64);

menu3.add(item61);

menu3.add(item62);

menubar.add(menu3);

menu4=new JMenu("查看");

item7=new JMenuItem("状态栏");

menu4.add(item7);

menubar.add(menu4);

menu5=new JMenu("帮助");

item8=new JMenuItem("我的日记本信息");

menu5.add(item8);

menubar.add(menu5);

setJMenuBar(menubar); //把菜单条添加到窗口顶端

Container con=getContentPane(); //调用getContentPane()方法获的内容面板

root=new DefaultMutableTreeNode("日历记事本"); //结合树的输入与输出建立一个日历记事本

for(i=1;i=12;i++)

{

month[i]=new DefaultMutableTreeNode(""+i+"月");

root.add(month[i]);

}

for(i=1;i=12;i++)

{

if(i==1||i==3||i==5||i==7||i==8||i==10||i==12)

{

for(int j=1;j=31;j++)

month[i].add(new DefaultMutableTreeNode(j+"日"));

}

else if(i==4||i==6||i==9||i==11)

{

for(int j=1;j=30;j++)

month[i].add(new DefaultMutableTreeNode(j+"日"));

}

else

{

for(int j=1;j=28;j++)

month[i].add(new DefaultMutableTreeNode(j+"日"));

}

}

tree=new JTree(root);

p=new JPanel(); //使用JPanel创建一个面板

p.add(b_save);p.add(b_del);p.add(b3);p.add(b4); //把这4个按钮组件假如面板中

scroll1=new JScrollPane(text,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); //把文本框放入滚动窗格中

b_save.addActionListener((ActionListener) this); //按钮的监听器

b_del.addActionListener((ActionListener) this);

scroll2=new JScrollPane(tree);

split1=new JSplitPane(JSplitPane.VERTICAL_SPLIT,true,p,scroll1); //水平拆分这4个按钮和文本区

split2=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,scroll2,split1); //竖直拆分树行日历和文本按钮区

item1.addActionListener((ActionListener) this); //菜单栏的监听器

item2.addActionListener((ActionListener) this);

item3.addActionListener((ActionListener) this);

item4.addActionListener((ActionListener) this);

item5.addActionListener((ActionListener) this);

item6.addActionListener((ActionListener) this);

item7.addActionListener((ActionListener) this);

item8.addActionListener((ActionListener) this);

item52.addActionListener((ActionListener) this);

item61.addActionListener((ActionListener) this);

item62.addActionListener((ActionListener) this);

item63.addActionListener((ActionListener) this);

tree.addTreeSelectionListener((TreeSelectionListener) this); //树形日历的监听器

con.setLayout(new FlowLayout()); //设置布局

setSize(600,500); //设置窗体的大小

Dimension screen=Toolkit.getDefaultToolkit().getScreenSize();

setLocation((screen.width-300)/2,(screen.height-220)/2);

setResizable(false); //设置窗口不可以调节大小

setVisible(true); //设置窗口为可视

con.add(split2); //把树形日历和按钮，文本区都加入到内容面板中

setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); //单击关闭图标后关闭窗口

}

public void valueChanged(TreeSelectionEvent e) //处理树形事件的接口

{

text.setText(null);

if(e.getSource()==tree)

{

DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();

if(node.isLeaf())

{

String str=node.toString();

for( i=0;i=12;i++)

{

if(node.getParent()==month[i])

{

try{String temp=null;

File f=new File(node.getParent().toString()+str+".text");

FileReader file=new FileReader(f);

BufferedReader in=new BufferedReader(file);

while((temp=in.readLine())!=null)

text.append(temp+'\n');

file.close();

in.close();

}

catch(Exception el){}

}

}

}

}

}

//}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==b_save) //保存按钮的实现方法

{

DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();

String str=node.toString();

if(node.isLeaf())

{

try{

File f=new File(node.getParent().toString()+str+".text");

FileWriter tofile=new FileWriter(f);

BufferedWriter out=new BufferedWriter(tofile);

out.write(text.getText(),0,(text.getText()).length());

out.flush();

tofile.close(); out.close();

}

catch(Exception el){}

}

}

else if(e.getSource()==b_del)

{

int n=JOptionPane.showConfirmDialog(this, "该文件还没有保存，确定要删除吗？","确认对话框", JOptionPane.YES_NO_OPTION);

if(n==JOptionPane.YES_OPTION)

{

DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();

String str=node.toString();

if(node.isLeaf())

{

File f=new File(node.getParent().toString()+str+".text");

f.delete();

}

}

else if(n==JOptionPane.NO_OPTION)

{

System.exit(0);

}

}

else if(e.getSource()==b3)

{

text.setEditable(false);

}

else if(e.getSource()==b4)

{

text.setEditable(true);

}

String selected=e.getActionCommand(); //获取命令

if(selected.equals("退出")){ //执行"退出"命令

dispose();

}

else if(selected.equals("新建")){

text.setText("");

}

else if(selected.equals("复制"))

{

text.copy();

}

else if(selected.equals("剪切"))

{

text.cut();

}

else if(selected. equals("粘贴"))

{

text.paste();

}

else if(selected.equals("全选"))

{

text.selectAll();

}

else if(selected.equals("密码登陆"))

{

LoginWindow login=new LoginWindow();

}

else if(selected.equals("设置字体颜色")){

Color newColor=JColorChooser.showDialog(this, "选择字体颜色", text.getForeground());

if(newColor !=null)

{

text.setForeground(newColor);

}

}

else if(selected.equals("设置背景颜色"))

{

Color newColor=JColorChooser.showDialog(this, "选择背景颜色", text.getBackground());

if(newColor !=null)

{

text.setBackground(newColor);

}

}

else if(selected.equals("锁定编辑区"))

{

text.setEditable(false);

}

else if(selected.equals("解除锁定"))

{

text.setEditable(true);

}

}

}

class LoginWindow extends JFrame implements ActionListener {

JPanel p1=new JPanel(); //定义并建立面板

JPanel p2=new JPanel();

JPanel p3=new JPanel();

JPanel p4=new JPanel();

JPanel p5=new JPanel();

JTextField text1=new JTextField(15); //用户名文本框

JPasswordField text2=new JPasswordField(15); //密码域

JButton ok=new JButton("确定");

JButton cancel=new JButton("取消");

LoginWindow()

{

setBackground(Color.DARK_GRAY); //设置背景颜色

Container con=getContentPane(); //取出内容面板

con.setLayout(new GridLayout(5,1)); //设置布局为5行1列

p2.add(new JLabel("用户名："));p2.add(text1); //将组件添加到中间容器

p3.add(new JLabel("密码"));p3.add(text2);

p4.add(ok);p4.add(cancel);

ok.addActionListener(this); //注册事件监听器

cancel.addActionListener(this);

text1.addActionListener(this);

text2.addActionListener(this);

con.add(p1); con.add(p2); con.add(p3); con.add(p4); con.add(p5); //将面板添加到内容面板

setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); //单击关闭图标后关闭窗口

setSize(300,220); //设置窗口的大小

Dimension screen=Toolkit.getDefaultToolkit().getScreenSize();

setLocation((screen.width-300)/2,(screen.height-220)/2);

setTitle("登录窗口");

setResizable(false); // 不让用户改变窗口大小

setVisible(true);

}

public void actionPerformed(ActionEvent e) {

if(e.getSource()==ok||e.getSource()==text2){

if(text1.getText().trim().equals("meijianwen") text2.getText().trim().equals("070341320")){

dispose(); //关闭登陆窗口

}

else{

JOptionPane.showMessageDialog(null, "用户名或密码错误！");

text1.requestFocus(); //设置焦点

text1.setSelectionStart(0); //设置选中文本开始位置

text1.setSelectionEnd(text1.getText().length());

}

}

else if(e.getSource()==cancel){ //单击取消按钮

dispose();

//System.exit(0);

}

else if(e.getSource()==text1) //在用户名文本框按回车焦点移到密码域

text2.requestFocus();

}

}

public class MyDiary

{

public static void main(String args[])

{

JFrame.setDefaultLookAndFeelDecorated(true);

Font font=new Font("JFrame",Font.PLAIN,14); //定义字体

Enumeration keys=UIManager.getLookAndFeelDefaults().keys(); //枚举风格关键字

while(keys.hasMoreElements())

{

Object key=keys.nextElement();

// if(((String)key).equals("Menu.foreground")||((String)key).equals("MenuItem.foreground"))

// UIManager.put(key,Color.DARK_GRAY); //设置菜单文字颜色

if(UIManager.get(key)instanceof Font)UIManager.put(key,font);

}

Diary win=new Diary();

win.validate();

}

}

java日记本源代码

晚上，已经快九点钟了，我看了会儿电视，肚子饿得“咕咕”直叫，于是我对妈妈说：“我饿了。”妈妈说：“想吃些什么呢？”我想了想说：“那就吃点面条吧。”

“自己也十岁了，该做点事情了。”妈妈对我说。

于是我来到厨房自己下面条吃。我先放了半锅水，然后把锅放在煤气灶上烧，蓝色的炉火很快把水烧开了。打开锅盖，一股热所直扑我的脸，锅里的水上下翻滚。

我用勺子小心翼翼地打了点开水倒进碗里，然后抓一把干面放进锅里烧，再用筷子轻轻地翻一翻。趁锅里在煮面条的时候，我往碗里放作料把猪油、葱花、味精、酱油放进碗里 。眨眼工夫，只见锅里边一层白沫慢慢往外溢。我知道面已经熟了，就关掉了煤气灶，把面条装进碗里，再用筷子拌一拌就可以吃了。

用Java编写简易记事本源代码

importjava.awt.BorderLayout;importjava.awt.Container;importjava.awt.Font;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjava.awt.event.InputEvent;importjava.awt.event.KeyAdapter;importjava.awt.event.KeyEvent;importjava.awt.event.MouseAdapter;importjava.awt.event.MouseEvent;importjava.awt.event.WindowAdapter;importjava.awt.event.WindowEvent;importjava.io.BufferedReader;importjava.io.BufferedWriter;importjava.io.File;importjava.io.FileReader;importjava.io.FileWriter;importjava.io.IOException;importjavax.swing.BorderFactory;importjavax.swing.JFileChooser;importjavax.swing.JFrame;importjavax.swing.JLabel;importjavax.swing.JMenu;importjavax.swing.JMenuBar;importjavax.swing.JMenuItem;importjavax.swing.JOptionPane;importjavax.swing.JPopupMenu;importjavax.swing.JScrollPane;importjavax.swing.JTextArea;importjavax.swing.KeyStroke;importjavax.swing.ScrollPaneConstants;importjavax.swing.SwingConstants;publicclassJNotePadUIextendsJFrame{privateJMenuItemmenuOpen;privateJMenuItemmenuSave;privateJMenuItemmenuSaveAs;privateJMenuItemmenuClose;privateJMenueditMenu;privateJMenuItemmenuCut;privateJMenuItemmenuCopy;privateJMenuItemmenuPaste;privateJMenuItemmenuAbout;privateJTextAreatextArea;privateJLabelstateBar;privateJFileChooserfileChooser;privateJPopupMenupopUpMenu;publicJNotePadUI(){super("新建文本文件");setUpUIComponent();setUpEventListener();setVisible(true);}privatevoidsetUpUIComponent(){setSize(640,480);//菜单栏JMenuBarmenuBar=newJMenuBar();//设置「文件」菜单JMenufileMenu=newJMenu("文件");menuOpen=newJMenuItem("打开");//快捷键设置menuOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK));menuSave=newJMenuItem("保存");menuSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));menuSaveAs=newJMenuItem("另存为");menuClose=newJMenuItem("关闭");menuClose.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q,InputEvent.CTRL_MASK));fileMenu.add(menuOpen);fileMenu.addSeparator();//分隔线fileMenu.add(menuSave);fileMenu.add(menuSaveAs);fileMenu.addSeparator();//分隔线fileMenu.add(menuClose);//设置「编辑」菜单JMenueditMenu=newJMenu("编辑");menuCut=newJMenuItem("剪切");menuCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK));menuCopy=newJMenuItem("复制");menuCopy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));menuPaste=newJMenuItem("粘贴");menuPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));editMenu.add(menuCut);editMenu.add(menuCopy);editMenu.add(menuPaste);//设置「关于」菜单JMenuaboutMenu=newJMenu("关于");menuAbout=newJMenuItem("关于JNotePad");aboutMenu.add(menuAbout);menuBar.add(fileMenu);menuBar.add(editMenu);menuBar.add(aboutMenu);setJMenuBar(menuBar);//文字编辑区域textArea=newJTextArea();textArea.setFont(newFont("宋体",Font.PLAIN,16));textArea.setLineWrap(true);JScrollPanepanel=newJScrollPane(textArea,ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);ContainercontentPane=getContentPane();contentPane.add(panel,BorderLayout.CENTER);//状态栏stateBar=newJLabel("未修改");stateBar.setHorizontalAlignment(SwingConstants.LEFT);stateBar.setBorder(BorderFactory.createEtchedBorder());contentPane.add(stateBar,BorderLayout.SOUTH);popUpMenu=editMenu.getPopupMenu();fileChooser=newJFileChooser();}privatevoidsetUpEventListener(){//按下窗口关闭钮事件处理addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvente){closeFile();}});//菜单-打开menuOpen.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){openFile();}});//菜单-保存menuSave.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){saveFile();}});//菜单-另存为menuSaveAs.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){saveFileAs();}});//菜单-关闭文件menuClose.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){closeFile();}});//菜单-剪切menuCut.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){cut();}});//菜单-复制menuCopy.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){copy();}});//菜单-粘贴menuPaste.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){paste();}});//菜单-关于menuAbout.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){//显示对话框JOptionPane.showOptionDialog(null,"程序名称:\nJNotePad\n"+"程序设计:\n\n"+"简介:\n一个简单的文字编辑器\n"+"可作为验收Java的实现对象\n"+"欢迎网友下载研究交流\n\n"+"/","关于JNotePad",JOptionPane.DEFAULT_OPTION,JOptionPane.INFORMATION_MESSAGE,null,null,null);}});//编辑区键盘事件textArea.addKeyListener(newKeyAdapter(){publicvoidkeyTyped(KeyEvente){processTextArea();}});//编辑区鼠标事件textArea.addMouseListener(newMouseAdapter(){publicvoidmouseReleased(MouseEvente){if(e.getButton()==MouseEvent.BUTTON3)popUpMenu.show(editMenu,e.getX(),e.getY());}publicvoidmouseClicked(MouseEvente){if(e.getButton()==MouseEvent.BUTTON1)popUpMenu.setVisible(false);}});}privatevoidopenFile(){if(isCurrentFileSaved()){//文件是否为保存状态open();//打开}else{//显示对话框intoption=JOptionPane.showConfirmDialog(null,"文件已修改，是否保存？","保存文件？",JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE,null);switch(option){//确认文件保存caseJOptionPane.YES_OPTION:saveFile();//保存文件break;//放弃文件保存caseJOptionPane.NO_OPTION:open();break;}}}privatebooleanisCurrentFileSaved(){if(stateBar.getText().equals("未修改")){returnfalse;}else{returntrue;}}privatevoidopen(){//fileChooser是JFileChooser的实例//显示文件选取的对话框intoption=fileChooser.showDialog(null,null);//使用者按下确认键if(option==JFileChooser.APPROVE_OPTION){try{//开启选取的文件BufferedReaderbuf=newBufferedReader(newFileReader(fileChooser.getSelectedFile()));//设定文件标题setTitle(fileChooser.getSelectedFile().toString());//清除前一次文件textArea.setText("");//设定状态栏stateBar.setText("未修改");//取得系统相依的换行字符StringlineSeparator=System.getProperty("line.separator");//读取文件并附加至文字编辑区Stringtext;while((text=buf.readLine())!=null){textArea.append(text);textArea.append(lineSeparator);}buf.close();}catch(IOExceptione){JOptionPane.showMessageDialog(null,e.toString(),"开启文件失败",JOptionPane.ERROR_MESSAGE);}}}privatevoidsaveFile(){//从标题栏取得文件名称Filefile=newFile(getTitle());//若指定的文件不存在if(!file.exists()){//执行另存为saveFileAs();}else{try{//开启指定的文件BufferedWriterbuf=newBufferedWriter(newFileWriter(file));//将文字编辑区的文字写入文件buf.write(textArea.getText());buf.close();//设定状态栏为未修改stateBar.setText("未修改");}catch(IOExceptione){JOptionPane.showMessageDialog(null,e.toString(),"写入文件失败",JOptionPane.ERROR_MESSAGE);}}}privatevoidsaveFileAs(){//显示文件对话框intoption=fileChooser.showSaveDialog(null);//如果确认选取文件if(option==JFileChooser.APPROVE_OPTION){//取得选择的文件Filefile=fileChooser.getSelectedFile();//在标题栏上设定文件名称setTitle(file.toString());try{//建立文件file.createNewFile();//进行文件保存saveFile();}catch(IOExceptione){JOptionPane.showMessageDialog(null,e.toString(),"无法建立新文件",JOptionPane.ERROR_MESSAGE);}}}privatevoidcloseFile(){//是否已保存文件if(isCurrentFileSaved()){//释放窗口资源，而后关闭程序dispose();}else{intoption=JOptionPane.showConfirmDialog(null,"文件已修改，是否保存？","保存文件？",JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE,null);switch(option){caseJOptionPane.YES_OPTION:saveFile();break;caseJOptionPane.NO_OPTION:dispose();}}}privatevoidcut(){textArea.cut();stateBar.setText("已修改");popUpMenu.setVisible(false);}privatevoidcopy(){textArea.copy();popUpMenu.setVisible(false);}privatevoidpaste(){textArea.paste();stateBar.setText("已修改");popUpMenu.setVisible(false);}privatevoidprocessTextArea(){stateBar.setText("已修改");}publicstaticvoidmain(String[]args){newJNotePadUI();}}

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