第十四周课程总结&实验报告（简单记事本的实现）

简易记事本的实现

package caidan;
import java.awt.event.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;

import javax.swing.*;


public   class JMenuDemo1 implements ActionListener {

    JFrame frame;
    JMenuBar bar;
    JMenu fileMenu,editMenu;
    JMenuItem newItem,openItem,saveItem,closeItem;
    ImageIcon newIcon,openIcon,saveIcon,closeIcon;
    JScrollPane scorll;
    JTextArea area;
    File file;
    private JFileChooser chooser;
    
    public JMenuDemo1(){
        frame = new JFrame("LXZ的小本本");
        bar = new JMenuBar();
        fileMenu = new JMenu("文件");
        editMenu = new JMenu("编辑");
        newItem = new JMenuItem("新建(N)",newIcon);
        openItem = new JMenuItem("打开(O)",openIcon);
        saveItem = new JMenuItem("另存为(A)",saveIcon);
        closeItem = new JMenuItem("关闭(X)",closeIcon);
        
        area = new JTextArea();
        scorll = new JScrollPane(area,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        newIcon = new ImageIcon("D:"+File.separator+"images"+File.separator+"3.png");
        openIcon = new ImageIcon("D:"+File.separator+"images"+File.separator+"1.png");
        saveIcon = new ImageIcon("D:"+File.separator+"images"+File.separator+"2.png");
        closeIcon = new ImageIcon("D:"+File.separator+"images"+File.separator+"4.png");
        area = new JTextArea();
        scorll = new JScrollPane(area);
        
        newItem.setMnemonic(KeyEvent.VK_N);
        openItem.setMnemonic(KeyEvent.VK_O);
        saveItem.setMnemonic(KeyEvent.VK_A);
        closeItem.setMnemonic(KeyEvent.VK_X);
        
         newItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,InputEvent.CTRL_DOWN_MASK));
         openItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_DOWN_MASK));
         saveItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,InputEvent.CTRL_DOWN_MASK));
         saveItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_B,InputEvent.CTRL_DOWN_MASK));
         closeItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_DOWN_MASK));

        fileMenu.add(newItem);
        fileMenu.add(openItem);
        fileMenu.add(saveItem);
        fileMenu.addSeparator();
        fileMenu.add(closeItem);
        
        newItem.addActionListener(this);
        openItem.addActionListener(this);
        saveItem.addActionListener(this);
        closeItem.addActionListener(this);
        
        bar.add(fileMenu);
        bar.add(editMenu);
        
        frame.setJMenuBar(bar);
        frame.add(scorll);
        frame.setSize(400, 300);
        frame.setVisible(true);
    }
    
    @Override
    public void actionPerformed(ActionEvent e) {
        Object obj = e.getSource();
        if (obj instanceof JMenuItem) {
            JMenuItem item = (JMenuItem) obj;
            if (item == newItem) {
                new JMenuDemo1();           
            }else if (item == openItem) {
                chooser = new JFileChooser();
                chooser.showOpenDialog(null);
                file = chooser.getSelectedFile();
            try {
                FileInputStream fis= new FileInputStream(file);
                    byte[] b = new byte[fis.available()];
                    fis.read(b);
                    area.append(new String(b));
                    fis.close();
                
            } catch (FileNotFoundException e1) {
                
                e1.printStackTrace();
            } catch (IOException e1) {
                
                e1.printStackTrace();
            }
        }else if(item == saveItem) {
            if(file!=null) {
                try {
                    PrintStream out = new PrintStream(new FileOutputStream(file));
                    out.print(this.area.getText());
                    out.close();
                } catch (FileNotFoundException e1) {
                    
                    e1.printStackTrace();
                }
            }
            
        }else if(item == saveItem) {
            chooser.showSaveDialog(null);
            file = chooser.getSelectedFile();
            if(!file.exists()) {
                try {
                    if(!file.exists()) {
                    file.createNewFile();
                    }
                    FileOutputStream fos=new FileOutputStream(file);
                    byte[] b = area.getText().getBytes();
                    fos.write(b);
                    fos.close();
                } catch (IOException e1) {
                    
                    e1.printStackTrace();
                
            }
        }
    }else if(item == closeItem) {
        System.exit(1);
    }
}



}
}


        

Main方法
package caidan;



public class JMenuDemo {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new JMenuDemo1();

    }

}

参照了老师的的代码进行编译了解了基本框架,将各部分拆解来单独分析有点困难.
实验结果

学习总结:
JDBC的主要操作和接口