java 编写的简易记事本

import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.*; public class FileWriteInputOutTest extends WindowAdapter implements ActionListener, TextListener { Frame f; TextArea edit; Panel p1; Button open, newFile, save, saveAs, about; FileDialog fd; File file1 = null; public static void main(String args[]) { FileWriteInputOutTest editer = new FileWriteInputOutTest(); editer.display(); } public void display() { f = new Frame("简易记事本"); f.setSize(680, 400); f.setLocation(200, 140); f.setBackground(Color.lightGray); f.addWindowListener(this); edit = new TextArea(); edit.setFont(new Font("Dialog", 0, 14)); f.add(edit); edit.addTextListener(this); p1 = new Panel(); p1.setLayout(new FlowLayout(FlowLayout.LEFT)); open = new Button("打开文件"); newFile = new Button("新建文件"); save = new Button("保存文件"); saveAs = new Button("另存为..."); about=new Button("关于...."); p1.add(open); p1.add(newFile); p1.add(save); p1.add(saveAs); p1.add(about); save.setEnabled(false); saveAs.setEnabled(false); open.addActionListener(this); newFile.addActionListener(this); about.addActionListener(this); save.addActionListener(this); saveAs.addActionListener(this); //this指主函数中 editer 这个对象 f.add(p1, "North"); f.setVisible(true); } public void textValueChanged(TextEvent e) { save.setEnabled(true); saveAs.setEnabled(true); } public void actionPerformed(ActionEvent e) { if (e.getSource() == open) { fd = new FileDialog(f, "打开", FileDialog.LOAD); fd.setVisible(true); if ((fd.getDirectory() != null) && (fd.getFile() != null)) { try { file1 = new File(fd.getDirectory(),fd.getFile()); FileReader fr = new FileReader(file1); BufferedReader br = new BufferedReader(fr); String aline; while((aline=br.readLine()) != null) edit.append(aline+"\r\n"); fr.close(); br.close(); } catch (IOException ioe) {} } } if (e.getSource() == save) { fd = new FileDialog(f, "保存", FileDialog.SAVE); fd.setVisible(true); if ((fd.getDirectory() != null) && (fd.getFile() != null)) { file1 = new File(fd.getDirectory(), fd.getFile()); save(file1); } } if (e.getSource() == saveAs) { fd = new FileDialog(f, "另存为", FileDialog.SAVE); fd.setVisible(true); if ((fd.getDirectory() != null) && (fd.getFile() != null)) { file1 = new File(fd.getDirectory(), fd.getFile()); save(file1); } } if (e.getSource() == newFile) { edit.setText(""); //JOptionPane.showMessageDialog(null, "OK"); } if (e.getSource() == about) { String message = " ----简易记事本----\n 版本：Version 1.0\n 感谢您的使用!"; JOptionPane.showMessageDialog(f, message, "关于...",JOptionPane.PLAIN_MESSAGE); } } public void save(File file1) { try { FileWriter fw = new FileWriter(file1); fw.write(edit.getText()); fw.close(); save.setEnabled(false); saveAs.setEnabled(false); } catch (IOException ioe) {} } public void windowClosing(WindowEvent e) { System.exit(0); } }