Java se项目：记事本

来源：互联网发布：mac dare you 不好看编辑：程序博客网时间：2024/05/16 04:46

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);        }    }

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