Java文本编辑器实现方法详解

public class EditFrame extends JFrame { // TODO 自动生成的构造函数存根 boolean saveFlag = false; File saveFileRoot = null; JFrame jFrame; JPanel jPanelSouth; JMenuBar jMenuBar1; JMenu jMenu1; JMenuItem jMenuItem1; JMenuItem jMenuItem2; JMenuItem jMenuItem3; JMenuItem jMenuItem4; JSeparator jSeparator1; JTextArea jTextArea; JScrollPane scrollPane;// 滚动条 public EditFrame() { // TODO 自动生成的构造函数存根 jFrame = new JFrame("水中鱼之1999-文本编辑器"); jPanelSouth = new JPanel(); jMenuBar1 = new JMenuBar(); jMenu1 = new JMenu("文件"); jMenuItem1 = new JMenuItem("打开"); jMenuItem2 = new JMenuItem("保存"); jMenuItem3 = new JMenuItem("另存为"); jMenuItem4 = new JMenuItem("退出"); jSeparator1 = new JSeparator(); jTextArea = new JTextArea(); scrollPane = new JScrollPane(jTextArea); jFrame.setSize(800, 500); jFrame.setLocationRelativeTo(null); jFrame.setVisible(false);  setLayout(); setSouthPanel(); // set relationship for your component setRelationShip(); // 设置 scrollPane for TextArea setScscrollPane(); iniClick(); } private void setRelationShip() { jFrame.add(BorderLayout.CENTER, scrollPane); jFrame.add(BorderLayout.SOUTH, jPanelSouth); jMenu1.add(jMenuItem1); jMenu1.add(jMenuItem2); jMenu1.add(jMenuItem3); jMenu1.add(jSeparator1); jMenu1.add(jMenuItem4); jMenuBar1.add(jMenu1); jFrame.setJMenuBar(jMenuBar1); } private void setLayout() { GridLayout gridLayout = new GridLayout(1, 2); jPanelSouth.setLayout(gridLayout); } private void setScscrollPane() {// jTextArea.setLineWrap(true);// 设置满一行自动换行 scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED); } private void setSouthPanel() { // add time for SouthPanel JLabel jLabelDate = new JLabel("Date"); JLabel jLabelTime = new JLabel("Time"); Timer timeAction = new Timer(1000, new ActionListener() {  public void actionPerformed(ActionEvent e) {  long timemillis = System.currentTimeMillis();  // 转换日期显示格式  SimpleDateFormat date = new SimpleDateFormat("yyyy 年 MM 月 dd 日 ");  jLabelDate.setText("  当前日期： " + date.format(new Date(timemillis)));  SimpleDateFormat time = new SimpleDateFormat("HH:mm:ss ");  jLabelTime.setText("  当前时间： " + time.format(new Date(timemillis)));  } }); jPanelSouth.add(jLabelDate); jPanelSouth.add(jLabelTime); timeAction.start(); } private void iniClick() { jFrame.addWindowListener(new WindowListener() {  @Override  public void windowOpened(WindowEvent e) {  // TODO Auto-generated method stub  }  @Override  public void windowIconified(WindowEvent e) {  // TODO Auto-generated method stub  }  @Override  public void windowDeiconified(WindowEvent e) {  // TODO Auto-generated method stub  }  @Override  public void windowDeactivated(WindowEvent e) {  // TODO Auto-generated method stub  }  @Override  public void windowClosing(WindowEvent e) {  // TODO Auto-generated method stub  int x = JOptionPane.showConfirmDialog(null, "确认退出么？", "友情提示", JOptionPane.OK_CANCEL_OPTION,   JOptionPane.WARNING_MESSAGE);  if (x == 0) {   System.exit(0);  }  }  @Override  public void windowClosed(WindowEvent e) {  // TODO Auto-generated method stub  }  @Override  public void windowActivated(WindowEvent e) {  // TODO Auto-generated method stub  } }); jMenuItem4.addActionListener(new ActionListener() {  @Override  public void actionPerformed(ActionEvent e) {  // TODO Auto-generated method stub  int x = JOptionPane.showConfirmDialog(null, "确认退出么？", "友情提示", JOptionPane.OK_CANCEL_OPTION,   JOptionPane.WARNING_MESSAGE);  if (x == 0) {   System.exit(0);  }  } }); jMenuItem1.addActionListener(new ActionListener() {  @Override  public void actionPerformed(ActionEvent e) {  // TODO Auto-generated method stub  FileReadThread fileReadThread = new FileReadThread(EditFrame.this);// 开启文件读取线程  fileReadThread.start();  System.out.println(saveFileRoot);  saveFlag = true;  jTextArea.setText("");  } }); jMenuItem3.addActionListener(new ActionListener() {  @Override  public void actionPerformed(ActionEvent e) {  // TODO Auto-generated method stub  Save save = new Save(EditFrame.this);  save.start();  saveFlag = true;  } }); jMenuItem2.addActionListener(new ActionListener() {  @Override  public void actionPerformed(ActionEvent e) {  // TODO Auto-generated method stub  if (!saveFlag) {   Save save = new Save(EditFrame.this);   save.start();   saveFlag = true;  } else {   new Save(EditFrame.this, saveFileRoot);  }  } }); } public JTextArea getjTextArea() { return jTextArea; } public void setjTextArea(JTextArea jTextArea) { this.jTextArea = jTextArea; } public File getSaveFileRoot() { return saveFileRoot; } public void setSaveFileRoot(File saveFileRoot) { this.saveFileRoot = saveFileRoot; } public JFrame getjFrame() { return jFrame; } public void setjFrame(JFrame jFrame) { this.jFrame = jFrame; }}

public class EditText { public static void main(String[] args) { new Thread() {  @Override  public void run() {  // TODO Auto-generated method stub  EditFrame editFrame = new EditFrame();    JFrame jFrame = new JFrame();  JPanel jPanel = new javax.swing.JPanel(){    protected void paintComponent(java.awt.Graphics g){      super.paintComponent(g);      g.drawImage(new ImageIcon("experiment_bac.jpg").getImage(),0,0,400,250,null);    }  };  jFrame.add(jPanel);  jFrame.setVisible(true);  jFrame.setSize(400, 300);  jFrame.setLocationRelativeTo(null);    try {   sleep(1500);  } catch (InterruptedException e) {   // TODO Auto-generated catch block   e.printStackTrace();  }  jFrame.dispose();  editFrame.getjFrame().setVisible(true);  } }.start(); }}

class FileReadThread extends Thread { private EditFrame test; public FileReadThread(EditFrame test ) { this.test = test; } @Override public void run() { JFileChooser chooser = new JFileChooser("d:/"); chooser.setFileFilter(new FileFilter() {// 定义文件过滤器,仅显示文件夹和txt文本  @Override  public String getDescription() {  return null;  }  @Override  public boolean accept(File file) {  if (file.isDirectory() || file.getName().endsWith(".txt"))   return true;  return false;  } }); int option = chooser.showOpenDialog(test); if (option == JFileChooser.APPROVE_OPTION) {  File selFile = chooser.getSelectedFile();  try {  BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(selFile), "gbk"));  test.setSaveFileRoot(selFile);  String line = null;  while ((line = reader.readLine()) != null) {   test.getjTextArea().append(line + "/n");   Thread.sleep(30);// 线程暂停,以看到读取过程效果  }  } catch (Exception e1) {  e1.printStackTrace();  }  JOptionPane.showMessageDialog(test, "读取完毕"); } }}

public class Save extends Thread { private EditFrame area; private File saveFileRoot = null; public Save(EditFrame area, File saveFileRoot) { System.out.println(saveFileRoot + "123"); String text = area.getjTextArea().getText(); String[] lines = text.trim().split("/n"); try {  PrintWriter out = new PrintWriter(new FileOutputStream(saveFileRoot), true);  for (String line : lines)  out.println(line); } catch (FileNotFoundException e) {  // TODO Auto-generated catch block  e.printStackTrace(); } } public Save(EditFrame area) { this.area = area; JFileChooser chooser = new JFileChooser(); chooser.setCurrentDirectory(new File(".")); chooser.setFileFilter(new FileFilter() {  @Override  public boolean accept(File f) {  return f.getName().toLowerCase().endsWith(".txt");  }  @Override  public String getDescription() {  return "SAVE TO";  } }); int r = chooser.showSaveDialog(area); if (r != JFileChooser.APPROVE_OPTION)  return; File f = chooser.getSelectedFile(); area.setSaveFileRoot(f); String text = area.getjTextArea().getText(); String[] lines = text.trim().split("/n"); try {  PrintWriter out = new PrintWriter(new FileOutputStream(f), true);  for (String line : lines)  out.println(line); } catch (FileNotFoundException e) {  // TODO Auto-generated catch block  e.printStackTrace(); } } public File getSaveFileRoot() { return saveFileRoot; } public void setSaveFileRoot(File saveFileRoot) { this.saveFileRoot = saveFileRoot; }}