第十四周课程总结&实验报告

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();

	}

}

		

本次完整实现参照了老师上课的代码，基本框架了解了，主要是每一个功能的实现会稍微比较吃力。

实验结果

学习总结#

2.

3.连接到数据库之中，就可以执行建表语句，使用如下的语句格式，可以创建数据库表：
CREATE TABLE 表名称(
字段名称1 字段类型 [DEFAULT 默认值] [约束] ,
字段名称2 字段类型 [DEFAULT 默认值] [约束] ,
...,
字段名称n 字段类型 [DEFAULT 默认值] [约束]) ;