第十三周课程总结

1.菜单组件

JMenu与JMenuBar

若在Java中实现菜单，则可以使用JMenu组件，不过，如果要使用JMenu则首先要了解JMenuBar组件。JMenuBar组件的功能是用来摆放JMenu组件，当建立完许多的JMenu组件之后，需要通过JMenuBar组件来将JMenu组件加入到窗口中

JMenu的常用方法

JMenu的常用方法

JMenuItem

JMenuItem:为菜单加入菜单项

JMenuItem的常用方法

2.JFileChooser

JFileChooser的常用方法

记事本

代码

package demo;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;

public class TextPad implements ActionListener{
	JFrame frame;
	JMenuBar bar;
	JMenu fileMenu,editMenu,formatMenu,lookMenu;
	JMenuItem newItem,openItem,saveItem,saveAnotherItem,closeItem;
	ImageIcon newIcon,openIcon,saveIcon,saveAnotherIcon,closeIcon;
	JMenuItem revocationItem,cutItem,copyItem,stickItem,deleteItem,allItem,timeDateItem;
	JMenuItem lineItem,typeFaceItem,zoomItem,statusItem;
	JScrollPane scroll;
	JTextArea area;
	JFileChooser chooser;             //文件选择框
	File file;
	
	public TextPad() {
		frame = new JFrame("记事本");
		bar=new JMenuBar();
		fileMenu=new JMenu("文件");
		editMenu=new JMenu("编辑");
		formatMenu=new JMenu("格式");
		lookMenu=new JMenu("查看");
		newIcon=new ImageIcon("e:"+File.separator+"Test"+File.separator+"小图标"+File.separator+"newIcon.png");
		openIcon=new ImageIcon("e:"+File.separator+"Test"+File.separator+"小图标"+File.separator+"openIcon.png");
		saveIcon=new ImageIcon("e:"+File.separator+"Test"+File.separator+"小图标"+File.separator+"saveIcon.png");
		saveAnotherIcon=new ImageIcon("e:"+File.separator+"Test"+File.separator+"小图标"+File.separator+"saveAnotherIcon.png");
		closeIcon=new ImageIcon("e:"+File.separator+"Test"+File.separator+"小图标"+File.separator+"closeIcon.png");	
		area=new JTextArea();
		scroll=new JScrollPane(area);

		
		newItem=new JMenuItem("新建（N）",newIcon);
		openItem=new JMenuItem("打开（O）",openIcon);
		saveItem=new JMenuItem("保存（S）",saveIcon);
		saveAnotherItem=new JMenuItem("另存为（D）",saveAnotherIcon);
		closeItem=new JMenuItem("关闭（X）",closeIcon);
		
		revocationItem=new JMenuItem("撤销（Z）");
		cutItem=new JMenuItem("剪切（T）");
		copyItem=new JMenuItem("复制（ C）");
		stickItem=new JMenuItem("粘贴（V）");
	    deleteItem=new JMenuItem("删除（P）");
		allItem=new JMenuItem("全选（A）");
		timeDateItem=new JMenuItem("时间日期（Q）");
		
		lineItem=new JMenuItem("自动换行（W）");
		typeFaceItem=new JMenuItem("字体（F）");
		zoomItem=new JMenuItem("缩放（R）");
		statusItem=new JMenuItem("状态栏（S）");
		//加上监视器
		newItem.addActionListener(this);
		openItem.addActionListener(this);
		saveItem.addActionListener(this);
		saveAnotherItem.addActionListener(this);
		revocationItem.addActionListener(this);
		cutItem.addActionListener(this);
		copyItem.addActionListener(this);		
		stickItem.addActionListener(this);
		deleteItem.addActionListener(this);
		allItem.addActionListener(this);
		timeDateItem.addActionListener(this);
		lineItem.addActionListener(this);
		typeFaceItem.addActionListener(this);
		zoomItem.addActionListener(this);
		statusItem.addActionListener(this);
		
		
		fileMenu.add(newItem);
		fileMenu.add(openItem);
		fileMenu.add(saveItem);
		fileMenu.add(saveAnotherItem);
		fileMenu.addSeparator();
		fileMenu.add(closeItem);
		
		editMenu.add(revocationItem);
		editMenu.add(cutItem);
		editMenu.add(copyItem);
		editMenu.add(stickItem);
		editMenu.add(deleteItem);
		editMenu.add(allItem);
		editMenu.add(timeDateItem);
		
		formatMenu.add(lineItem);
		formatMenu.add(typeFaceItem);
		lookMenu.add(zoomItem);
		lookMenu.add(statusItem);
		
		newItem.setMnemonic(KeyEvent.VK_N);
		openItem.setMnemonic(KeyEvent.VK_O);
		saveItem.setMnemonic(KeyEvent.VK_S);
		saveAnotherItem.setMnemonic(KeyEvent.VK_D);
		closeItem.setMnemonic(KeyEvent.VK_X);
		revocationItem.setMnemonic(KeyEvent.VK_Z);
		cutItem.setMnemonic(KeyEvent.VK_T);
		copyItem.setMnemonic(KeyEvent.VK_C);
		stickItem.setMnemonic(KeyEvent.VK_V);
		deleteItem.setMnemonic(KeyEvent.VK_P);
		allItem.setMnemonic(KeyEvent.VK_A);
		timeDateItem.setMnemonic(KeyEvent.VK_Q);
		
		//快捷键
		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_S,InputEvent.CTRL_DOWN_MASK));
		saveAnotherItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_D,InputEvent.CTRL_DOWN_MASK));
		closeItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_X,InputEvent.CTRL_DOWN_MASK));
		revocationItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_Z,InputEvent.CTRL_DOWN_MASK));
		cutItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_T,InputEvent.CTRL_DOWN_MASK));
		copyItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_C,InputEvent.CTRL_DOWN_MASK));	
		stickItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_V,InputEvent.CTRL_DOWN_MASK));
		deleteItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_P,InputEvent.CTRL_DOWN_MASK));
		allItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_A,InputEvent.CTRL_DOWN_MASK));
		timeDateItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_Q,InputEvent.CTRL_DOWN_MASK));

		
		bar.add(fileMenu);
		bar.add(editMenu);
		bar.add(formatMenu);
		bar.add(lookMenu);
		
		frame.setJMenuBar(bar);
		frame.add(scroll);
		frame.setSize(600,400);
		frame.setLocation(200, 100);
		frame.setVisible(true);
	}

	@Override
	public void actionPerformed(ActionEvent event) {
		Object obj=event.getSource();
		if(obj instanceof JMenuItem) {
			JMenuItem item = (JMenuItem) obj;
			if(item==newItem) {
				new TextPad();
			}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 e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}else if(item==saveItem) {
				chooser=new JFileChooser();
				chooser.showSaveDialog(null);
				FileOutputStream fos;
				try {
					fos = new FileOutputStream(file);
					byte[] b=area.getText().getBytes();
					fos.write(b);
					fos.close();
				} catch (FileNotFoundException e) {
					e.printStackTrace();
				} catch (IOException e) {				
				}			
			}else if(item==saveAnotherItem) {
				chooser=new JFileChooser();
				chooser.showSaveDialog(null);
				file=chooser.getSelectedFile();
				try {
					if(!file.exists()) {
						file.createNewFile();
					}
					FileOutputStream fos=new FileOutputStream(file);
					byte[] b=area.getText().getBytes();
					fos.write(b);
					fos.close();
				} catch (FileNotFoundException e) {					
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}
				
			}else if(item==closeItem) {
				System.exit(1);
			}
		}
		
	}
}

package demo;

public class Test {

	public static void main(String[] args) {
		new TextPad();

	}

}

运行截图