第十四周课程总结&实验报告（简单记事本的实现）

记事本：

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

import static javax.swing.KeyStroke.*;

public class hua implements ActionListener{
    JFrame frame;
    JMenuBar bar;
    JMenu fileMenu, editMenu,formatMenu,viewMenu,helpMenu;
    JMenuItem newItem, openItem, saveItem, closeItem;
    ImageIcon newIcon, openIcon, saveIcon, closeIcon;
    JScrollPane scroll;
    JTextArea area;
    JFileChooser chooser;
    File file;


    public hua() {
        frame = new JFrame("ZY");
        bar = new JMenuBar();
        fileMenu = new JMenu("文件(F)");
        editMenu = new JMenu("编辑(E)");
        formatMenu= new JMenu("格式(O)");
        viewMenu=new JMenu("查看(V)");
        helpMenu= new JMenu("帮助(H)");
        newIcon = new ImageIcon("d:" + File.separator + "Test" + File.separator + "A.png");
        openIcon = new ImageIcon("d:" + File.separator + "Test" + File.separator + "B.png");
        saveIcon = new ImageIcon("d:" + File.separator + "Test" + File.separator + "C.png");
        closeIcon = new ImageIcon("d:" + File.separator + "Test" + File.separator + "D.png");
        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();
        scroll = 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_MASK));
        openItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_MASK));
        saveItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_MASK));
        closeItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_MASK));

        fileMenu.add(newItem);
        fileMenu.add(openItem);
        fileMenu.add(saveItem);
        fileMenu.addSeparator();
        fileMenu.add(closeItem);
        newItem.addActionListener((ActionListener) this);
        openItem.addActionListener((ActionListener) this);
        saveItem.addActionListener((ActionListener) this);
        closeItem.addActionListener((ActionListener) this);

        bar.add(fileMenu);
        bar.add(editMenu);
        bar.add(formatMenu);
        bar.add(viewMenu);
        bar.add(helpMenu);
        frame.setJMenuBar(bar);
        frame.add(scroll);
        frame.setVisible(true);
        frame.pack();
    }

    public void actionPerformed(ActionEvent event) {
        Object obj = event.getSource();
        if (obj instanceof JMenuItem) {
            JMenuItem item = (JMenuItem) obj;
            //加入动作监听
            if (item == newItem) {
                new hua();
            }
            else if(item==openItem){
                JFileChooser chooser=new JFileChooser();
                chooser.showOpenDialog(null);
                file=chooser.getSelectedFile();//返回选择的文件
                try {
                    FileInputStream fis=new FileInputStream(file);
                    try {
                        byte[] b=new byte[fis.available()];
                        fis.read(b);
                        area.append(new String(b));
                        fis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                } catch (FileNotFoundException e) {
                    e.printStackTrace();

                }
            }
            else if (item==saveItem){
                JFileChooser chooser = new JFileChooser();
                chooser.showSaveDialog(null);
                file=chooser.getSelectedFile();
                if (!file.exists()) {
                    try {
                        file.createNewFile();
                    } catch (IOException e) {
                        e.printStackTrace();
                        try {
                            FileOutputStream fos=new FileOutputStream(file);
                            byte[] b = area.getText().getBytes();
                            try {
                                fos.write(b);
                            } catch (IOException ex) {
                                ex.printStackTrace();
                            }
                            try {
                                fos.close();
                            } catch (IOException ex) {
                                ex.printStackTrace();
                            }
                        } catch (FileNotFoundException ex) {
                            ex.printStackTrace();
                        }
                    }
                }
            }


            else  if(item==closeItem){
                System.exit(1);
            }
        }
    }
}

测试运行：

public class huahai {
    public static void main(String[] args) {
        new hua();
    }
}

实验结果：

学习总结：

这一周完成了记事本和学习了一些数据库库，了解到了一些不怎么清晰的框架，听老师讲析了一些数据库包的下载地址，如何去使用，

总体而言Java的学习是越来越烧脑，因为很多地方需要详细去了解，这东西估计是熟能生巧，相信更多的练习会让我有很大的进步。