Java记事本【源代码 + 实验报告】

import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import javax.swing.*; public class Notebook extends JFrame { Container contianer; JFileChooser fc=new JFileChooser(); File file=null; JTextArea jta; private MyFindDialog fd = new MyFindDialog(this, jta); public Notebook() { this.setTitle("记事本"); contianer=this.getContentPane(); contianer.setLayout(new BorderLayout()); jta=new JTextArea(); contianer.add(jta); JMenuBar mb=new JMenuBar(); buildMainMenu(mb); this.setJMenuBar(mb); this.setVisible(true); this.setSize(650, 450); } void buildMainMenu(JMenuBar mb) { JMenu fileMenu=new JMenu("文件（F）"); fileMenu.setMnemonic(KeyEvent.VK_F); JMenuItem newMenuItem=new JMenuItem("新建"); fileMenu.add(newMenuItem); JMenuItem openMenuItem=new JMenuItem("打开"); openMenuItem.setMnemonic(KeyEvent.VK_O); openMenuItem.addActionListener(new OpenActionListener()); fileMenu.add(openMenuItem); JMenuItem saveMenuItem=new JMenuItem("保存"); saveMenuItem.setMnemonic(KeyEvent.VK_S); saveMenuItem.addActionListener(new SaveActionListener()); fileMenu.add(saveMenuItem); JMenuItem saveasMenuItem=new JMenuItem("另存为"); saveasMenuItem.setMnemonic(KeyEvent.VK_A); saveasMenuItem.addActionListener(new SaveActionListener()); fileMenu.add(saveasMenuItem); JMenuItem exitMenuItem=new JMenuItem("退出"); exitMenuItem.setMnemonic(KeyEvent.VK_E); exitMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E ,ActionEvent.CTRL_MASK)); exitMenuItem.addActionListener(new ExitActionListener()); fileMenu.add(exitMenuItem); mb.add(fileMenu); JMenu editMenu=new JMenu("编辑（E）"); editMenu.setMnemonic(KeyEvent.VK_E); JMenuItem cutMenuItem=new JMenuItem("剪切"); cutMenuItem.setMnemonic(KeyEvent.VK_T); cutMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, ActionEvent.CTRL_MASK)); cutMenuItem.addActionListener(new CutActionListener()); editMenu.add(cutMenuItem); JMenuItem copyMenuItem=new JMenuItem("复制"); copyMenuItem.setMnemonic(KeyEvent.VK_C); copyMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, ActionEvent.CTRL_MASK)); copyMenuItem.addActionListener(new CopyActionListener()); editMenu.add(copyMenuItem); JMenuItem pasteMenuItem=new JMenuItem("粘贴"); pasteMenuItem.setMnemonic(KeyEvent.VK_P); pasteMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, ActionEvent.CTRL_MASK)); pasteMenuItem.addActionListener(new PasteActionListener()); editMenu.add(pasteMenuItem); JMenuItem sallMenuItem=new JMenuItem("全选"); sallMenuItem.setMnemonic(KeyEvent.VK_A); sallMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, ActionEvent.CTRL_MASK)); sallMenuItem.addActionListener(new SallActionListener()); editMenu.add(sallMenuItem); JMenuItem searchMenuItem=new JMenuItem("查找"); searchMenuItem.setMnemonic(KeyEvent.VK_S); searchMenuItem.addActionListener(new SearchActionListener()); editMenu.add(searchMenuItem); JMenuItem chanMenuItem=new JMenuItem("替换"); chanMenuItem.setMnemonic(KeyEvent.VK_G); chanMenuItem.addActionListener(new ChanActionListener()); editMenu.add(chanMenuItem); mb.add(editMenu); JMenu helpMenu=new JMenu("帮助（H）"); helpMenu.setMnemonic(KeyEvent.VK_H); JMenuItem abouthMenuItem=new JMenuItem("关于记事本"); abouthMenuItem.setMnemonic(KeyEvent.VK_A); abouthMenuItem.addActionListener(new AbouthActionListener()); helpMenu.add(abouthMenuItem); mb.add(helpMenu); } class MyFindDialog extends JDialog implements ActionListener { private Label l1 = new Label("查找字符串"); private Label l2 = new Label("替换字符串"); private TextField tf1 = new TextField(10); private TextField tf2 = new TextField(10); private Button b1 = new Button("向下查找"); private Button b2 = new Button("替换"); public MyFindDialog(Frame owner, JTextArea jta) { super(owner, "查找", false); setLayout(null); l1.setBounds(10, 30, 80, 20); l2.setBounds(10, 70, 80, 20); tf1.setBounds(90, 30, 90, 20); tf2.setBounds(90, 70, 80, 20); b1.setBounds(190, 30, 80, 20); b2.setBounds(190, 70, 80, 20); add(l1); add(l2); add(tf1); add(tf2); add(b1); add(b2); setResizable(false); b1.addActionListener(this); b2.addActionListener(this); } public void showFind() { setTitle("查找"); setSize(280, 300); setVisible(true); } public void showReplace() { setTitle("查找替换"); setSize(280,300); setVisible(true); } private void find() { String content = jta.getText(); String str = tf1.getText(); int pp=jta.getCaretPosition(); int end=content.length(); String text=content.substring(pp,end); if(str!=null&&!str.equals("")) { int start=text.indexOf(str); if(start>=0) {start=start+pp; jta.setSelectionStart(start); jta.setSelectionEnd(start+str.length()); } else { javax.swing.JOptionPane.showMessageDialog(this,"成功完成向下查找!","查找完毕",JOptionPane.OK_OPTION | JOptionPane.INFORMATION_MESSAGE); } } } private void replace() { String str2 = tf2.getText(); find(); jta.replaceRange(str2, jta.getSelectionStart(),jta.getSelectionEnd()); } public void actionPerformed(ActionEvent e) { if (e.getSource() == b1) find(); else if (e.getSource() == b2) replace(); } } class SaveActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { if(file!=null) fc.setSelectedFile(file); int returnVal=fc.showSaveDialog(Notebook.this); if(returnVal==JFileChooser.APPROVE_OPTION){ file=fc.getSelectedFile(); saving();} } void saving(){ try{ FileWriter Writef=new FileWriter(file); Writef.write(jta.getText()); Writef.close(); } catch(Exception e){e.printStackTrace();} } } class OpenActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { if(file !=null)fc.setSelectedFile(file); int returnVal=fc.showOpenDialog(Notebook.this); if(returnVal==JFileChooser.APPROVE_OPTION){ file=fc.getSelectedFile(); unfold();}} void unfold(){ try{ FileReader Readf=new FileReader(file); int len=(int)file.length(); char []buffer=new char[len]; Readf.read(buffer,0,len); Readf.close(); jta.setText(new String(buffer)); }catch(Exception e){e.printStackTrace();} } } class ExitActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { setVisible(false); dispose(); System.exit(0); } } class CutActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { jta.cut(); } } class CopyActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { jta.copy(); } } class PasteActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { jta.paste(); } } class SallActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { jta.setSelectionStart(0); jta.setSelectionEnd(jta.getText().length()); } } class SearchActionListen