Java se项目：记事本

         记事本算是一个小项目，对于学习JAVA SE新人来说，是适合不过的，既用不到网络编程，也永不到数据库的编程，也暂时不管国际化等！

         项目分析：主类继承了JFrame类，是程序的入口点，这个类放入了菜单栏，状态栏和文本的编辑区域，构造方法里面初始化了菜单的各各按钮。并且定义了事件的抽象数组，这些抽象的数组分别各自定义，这些类都继承了AbstratAction,实现具体的事件处理！

        需要注意的地方：由于我们需要在各个类里面处理事件，用到MyPad里面的属性，或者说是用到里面的变量！因此，我们的每个事件处理类都把MyPad这个类做为其属性，在构造方法时候作为参数传过去！

package cn.com.action;

import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.DefaultStyledDocument;

import cn.com.shizongger.MyPad;

public class NewActionextendsAbstractAction{
private MyPad myPad = null;

public NewAction(MyPad myPad){
super("新建");
this.myPad= myPad;
}

@Override
public voidactionPerformed(ActionEvent arg0){
//清空文本内容
myPad.textPane.setDocument(newDefaultStyledDocument());
}
}

package cn.com.action;

import java.awt.event.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import javax.swing.*;
import cn.com.shizongger.MyPad;

public class OpenActionextendsAbstractAction{

private MyPad myPad = null;

public OpenAction(MyPad myPad){
super("打开");
this.myPad= myPad;
}

@Override
public voidactionPerformed(ActionEvent e){
int i = myPad.fileChooser.showSaveDialog(myPad);//显示打开文件对话框
if(i==JFileChooser.APPROVE_OPTION){        //点击对话框中打开的选项
File f = myPad.fileChooser.getSelectedFile();    //得到选择的文件

try {
InputStream is = new FileInputStream(f);
try {
myPad.textPane.read(is,"d");
} catch (IOException e1){
e1.printStackTrace();
}
} catch (FileNotFoundException e1){
e1.printStackTrace();
}
}
}
}

package cn.com.action;

import java.awt.event.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.swing.*;

import cn.com.shizongger.MyPad;

public class SavaAction extends AbstractAction {

MyPad myPad = null;

public SavaAction(MyPad myPad) {
super("保存");
this.myPad= myPad;
}

@Override
public void actionPerformed(ActionEvent e) {

int i = myPad.fileChooser.showSaveDialog(myPad);    //显示保存文件对话框
if(i== JFileChooser.APPROVE_OPTION) {
File f = myPad.fileChooser.getSelectedFile();

try {
FileOutputStream os = new FileOutputStream(f);
try {
os.write(myPad.textPane.getText().getBytes());
} catch (IOException e1) {
e1.printStackTrace();
}
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
}
}
}

package cn.com.shizongger;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

import javax.swing.*;
import cn.com.action.*;

public class MyPadextendsJFrame{

public JTextPane textPane=new JTextPane();    //文本窗格，编辑窗口

public JLabel statusBar=new JLabel();    //状态栏

public JFileChooserfileChooser=new JFileChooser();    //文件选择器

Action[] actions=null;

//构造方法
public MyPad(){
super("记事本1.0版本");

//设置文本的字体和文字大小
textPane.setBackground(Color.LIGHT_GRAY);
textPane.setForeground(Color.ORANGE);
textPane.setFont(newFont("TimesRoman",Font.PLAIN, 18));

Action[] actions={    //Action数组，各种操作的命令
new NewAction(this),
new OpenAction(this),
new SavaAction(this),
new CutAction(this),
new CopyAction(this),
new PasteAction(this),
new AboutAction(this),
new ExitAction(this)
};
this.actions= actions;        //将构造方法的actions赋值给类的属性actions

this.setJMenuBar(createJMenuBar(actions));        //设置菜单栏
Container container = this.getContentPane();    //获取容器
container.add(createJToolBar(actions),BorderLayout.NORTH);        //增加工具栏
container.add(textPane,BorderLayout.CENTER);
container.add(statusBar,BorderLayout.SOUTH);

this.addWindowListener(newWindowListener(){

@Override
public void windowActivated(WindowEvent arg0){
}

@Override
public void windowClosed(WindowEvent arg0){
}

@Override
public void windowClosing(WindowEvent arg0){
System.exit(0);
}

@Override
public void windowDeactivated(WindowEvent arg0){
}

@Override
public void windowDeiconified(WindowEvent arg0){
}

@Override
public void windowIconified(WindowEvent arg0){
}

@Override
public void windowOpened(WindowEvent arg0){
}

});
}

//创建菜单栏，参数是各个事件，返回菜单栏JMenuBar
private JMenuBar createJMenuBar(Action[] actions) {
JMenuBar menuBar = newJMenuBar();        //实例化菜单栏
JMenu menuFile = new JMenu("文件");
JMenu menuEdit = new JMenu("编辑");
JMenu menuAbout = new JMenu("帮助");

//添加新菜单项
menuFile.add(newJMenuItem(actions[0]));
menuFile.add(newJMenuItem(actions[1]));
menuFile.add(newJMenuItem(actions[2]));
menuFile.add(newJMenuItem(actions[3]));
menuFile.add(newJMenuItem(actions[4]));
menuFile.add(newJMenuItem(actions[5]));
menuFile.add(newJMenuItem(actions[6]));
menuFile.add(newJMenuItem(actions[7]));

menuBar.add(menuFile);
menuBar.add(menuEdit);
menuBar.add(menuAbout);

return menuBar;
}

//创建工具条，
private JToolBar createJToolBar(Action[] actions) {
JToolBar toolBar = new JToolBar();    //实例化工具条

for(int i= 0; i< actions.length; i++){
JButton button = newJButton(actions[i]);    //实例化新按钮
button.setRequestFocusEnabled(false);        //设置不需要焦点
toolBar.add(button);        //增加按钮到工具栏
}

return toolBar;
}

public staticvoid main(String[] args){
MyPad frame = new MyPad();
frame.setSize(500, 500);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
}
}

package cn.com.action;

import java.awt.event.*;
import javax.swing.*;

import cn.com.shizongger.MyPad;

public class CutActionextendsAbstractAction{
MyPad myPad = null;

public CutAction(MyPad myPad){
super("剪切");
this.myPad= myPad;
}
@Override
public voidactionPerformed(ActionEvent e){
myPad.textPane.cut();
}
}

package cn.com.action;

import java.awt.event.*;
import javax.swing.*;

import cn.com.shizongger.MyPad;

public class CopyActionextendsAbstractAction{
MyPad myPad = null;

public CopyAction(MyPad myPad){
super("复制");
this.myPad= myPad;
}

@Override
public voidactionPerformed(ActionEvent e){
myPad.textPane.copy();
}
}

package cn.com.action;

import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;

import cn.com.shizongger.MyPad;

public class PasteActionextendsAbstractAction{

private MyPad myPad = null;

public PasteAction(MyPad myPad){
super("粘贴");
this.myPad= myPad;
}

@Override
public voidactionPerformed(ActionEvent e){
myPad.textPane.paste();
}
}

package cn.com.action;

import java.awt.event.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.swing.*;

import cn.com.shizongger.MyPad;

public class ExitActionextendsAbstractAction{

private MyPad myPad = null;

public ExitAction(MyPad myPad){
super("退出");
this.myPad= myPad;
}

@Override
public voidactionPerformed(ActionEvent e){
File f = myPad.fileChooser.getSelectedFile();

//如果文件不存在，那么直接推出
if(f!=null) {
int option = JOptionPane.showConfirmDialog(null,"要保存文本么？");
if(JOptionPane.YES_OPTION==option){
try {
OutputStream os = new FileOutputStream(f);
try {
os.write(myPad.textPane.getText().getBytes());
} catch (IOException e1){
e1.printStackTrace();
}
} catch (FileNotFoundException e1){
e1.printStackTrace();
}
System.exit(0);
}elseif(JOptionPane.CANCEL_OPTION==option) {
return;
}
}
System.exit(0);
}
}

package cn.com.action;

import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;
import javax.swing.JOptionPane;

import cn.com.shizongger.MyPad;

public class AboutActionextendsAbstractAction{

MyPad myPad = null;

public AboutAction(MyPad myPad){
super("关于");
this.myPad= myPad;
}

@Override
public voidactionPerformed(ActionEvent e){
String output = "文本编辑器1.0版本\n"+
"作者：张仕宗\n" +
"日期：2015.5，8\n" +
"这是学习java以来的第一个比较综合的项目\n" +
"你的支持是我前进的动力";

JOptionPane.showMessageDialog(myPad,output);
}
}