jishiben.md

import java.io.; import java.util.Calendar; import java.awt.; import java.awt.event.; import javax.swing.; public class MyNotepad extends JFrame implements ActionListener,ItemListener,WindowListener,MouseListener { Container c = this.getContentPane(); JMenuBar jmb = new JMenuBar();

JMenu jm1 = new JMenu("文件"); JMenu jm2 = new JMenu("编辑"); JMenu jm3 = new JMenu("格式"); JMenu jm4 = new JMenu("帮助");

JMenuItem jmi1 = new JMenuItem("新建"); JMenuItem jmi2 = new JMenuItem("打开"); JMenuItem jmi3 = new JMenuItem("保存"); JMenuItem jmi4 = new JMenuItem("退出");

JMenuItem jmi5 = new JMenuItem("日期和时间");

JMenuItem jmi6 = new JMenuItem("关于");

JCheckBoxMenuItem jcbmi = new JCheckBoxMenuItem("自动换行");

JTextArea jta = new JTextArea(15,15); JScrollPane jsp = new JScrollPane(jta);

MyNotepad() { this.addWindowListener(this); c.setLayout(new BorderLayout()); c.add(jmb,BorderLayout.NORTH); this.setTitle("MyNotepad"); jmb.add(jm1); jm1.addActionListener(this); jmb.add(jm2); jmb.add(jm3); jmb.add(jm4);

jm1.add(jmi1); jmi1.addActionListener(this); jm1.addSeparator(); jm1.add(jmi2); jmi2.addActionListener(this); jm1.addSeparator(); jm1.add(jmi3); jmi3.addActionListener(this); jm1.addSeparator(); jm1.add(jmi4); jmi4.addActionListener(this);

jm2.add(jmi5); jmi5.addActionListener(this);

jm3.add(jcbmi); //换行 jcbmi.addItemListener(this);

jm4.add(jmi6); jmi6.addActionListener(this);

c.add(jsp); this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); this.setSize(500,500); this.setVisible(true); } public void actionPerformed(ActionEvent e) { //新建 if(e.getSource()==jmi1) { jta.setText(""); this.setTitle("New MyNoetpad"); } //打开 if(e.getSource()==jmi2) { File f1; JFileChooser jfc1 = new JFileChooser(); int num1 = jfc1.showOpenDialog(this); if(num1==JFileChooser.APPROVE_OPTION) { try{ f1 = jfc1.getSelectedFile(); this.setTitle(f1.getName()); FileReader fr = new FileReader(f1); BufferedReader br = new BufferedReader(fr); String str; while((str = br.readLine())!=null) { jta.setText(str); } fr.close(); br.close(); }catch(FileNotFoundException e1){ e1.printStackTrace(); }catch(IOException e2){ e2.printStackTrace();} } } //保存 if(e.getSource()==jmi3) { File f2 = null; JFileChooser jfc2 = new JFileChooser(); int num2 = jfc2.showSaveDialog(this); if(num2==JFileChooser.APPROVE_OPTION) { f2=jfc2.getSelectedFile(); this.setTitle(f2.getName()); try{ FileWriter fw = new FileWriter(f2); BufferedWriter bw = new BufferedWriter(fw); bw.write(jta.getText()); bw.close(); fw.close(); }catch(IOException e2){e2.printStackTrace(); } } } //退出 if(e.getSource()==jmi4) { int a = JOptionPane.showConfirmDialog(this,"文件已被改变，是否要保存？","提示",JOptionPane.YES_NO_CANCEL_OPTION); if(a==1) { this.dispose(); } else if(a==0) { File f2 = null; JFileChooser jfc2 = new JFileChooser(); int num2 = jfc2.showSaveDialog(this); if(num2==JFileChooser.APPROVE_OPTION) { f2=jfc2.getSelectedFile(); this.setTitle(f2.getName()); try{ FileWriter fw = new FileWriter(f2); BufferedWriter bw = new BufferedWriter(fw); bw.write(jta.getText()); bw.close(); fw.close(); }catch(IOException e2){ e2.printStackTrace(); } this.dispose(); } } } //日期 if(e.getSource()==jmi5) { Calendar c1 =Calendar.getInstance(); int y = c1.get(Calendar.YEAR); int m = c1.get(Calendar.MONTH); int d = c1.get(Calendar.DATE); int h = c1.get(Calendar.HOUR); int m1 = c1.get(Calendar.MINUTE); int m2 = m+1; jta.setText(y+"年"+m2+"月"+d+"日"+h+":"+m1); } //关于作者 if(e.getSource()==jmi6) { JOptionPane.showConfirmDialog(this,"作者：\n 南阳理工 \n 刘云争","提示",JOptionPane.CANCEL_OPTION); } } //换行 public void itemStateChanged(ItemEvent e2) { if(e2.getItemSelectable()==jcbmi){ jta.setLineWrap(true); }else jta.setLineWrap(false); } public static void main(String[] args) { new MyNotepad(); } //添加监听 public void windowOpened(WindowEvent arg0) { } //关闭窗口时，提示保存 public void windowClosing(WindowEvent arg0) { int a = JOptionPane.showConfirmDialog(this,"文件已被改变，是否要保存？","提示",JOptionPane.YES_NO_CANCEL_OPTION); if(a==1) { this.dispose(); } else if(a==0){ File f2 = null; JFileChooser jfc2 = new JFileChooser(); int num2 = jfc2.showSaveDialog(this); if(num2==JFileChooser.APPROVE_OPTION) { f2=jfc2.getSelectedFile(); this.setTitle(f2.getName()); try{ FileWriter fw = new FileWriter(f2); BufferedWriter bw = new BufferedWriter(fw); bw.write(jta.getText()); bw.close(); fw.close(); }catch(IOException e2){ e2.printStackTrace(); } } if(a==2){} } } public void windowClosed(WindowEvent arg0) { } public void windowIconified(WindowEvent arg0) { } public void windowDeiconified(WindowEvent arg0) { } public void windowActivated(WindowEvent arg0) { } public void windowDeactivated(WindowEvent arg0) { } public void mouseClicked(MouseEvent arg0) { } public void mousePressed(MouseEvent arg0) { } public void mouseReleased(MouseEvent arg0) { } public void mouseEntered(MouseEvent arg0) { } public void mouseExited(MouseEvent arg0) { } }