iostylededitor.java

java swing 开发代码

// IOStyledEditor.java
// An extension of StyledEditor that adds document serialization.
//
package	jswing.ch23;

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

public class IOStyledEditor extends StyledEditor {

  public static void main(String[] args) {
    IOStyledEditor te = new IOStyledEditor();
    te.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    te.setVisible(true);
  }

  // Provide a new open action.
  protected Action getOpenAction() {
    if (inAction == null)
      inAction = new InAction();
    return inAction;
  }

  // Provide a new save action.
  protected Action getSaveAction() {
    if (outAction == null)
      outAction = new OutAction();
    return outAction;
  }

  private Action inAction;
  private Action outAction;

  // An action that saves the document as a serialized object
  class OutAction extends AbstractAction {
    public OutAction() {
      super("Serialize Out", new ImageIcon("icons/save.gif"));
    }

    public void actionPerformed(ActionEvent ev) {
      JFileChooser chooser = new JFileChooser();
      if (chooser.showSaveDialog(IOStyledEditor.this) !=
          JFileChooser.APPROVE_OPTION)
        return;
      File file = chooser.getSelectedFile();
      if (file == null)
        return;

      FileOutputStream writer = null;
      try {
        Document doc = getTextComponent().getDocument();
        writer = new FileOutputStream(file);
        ObjectOutputStream oos = new ObjectOutputStream(writer);
        oos.writeObject(doc);  // Write the document.
      }
      catch (IOException ex) {
        JOptionPane.showMessageDialog(IOStyledEditor.this,
        "File Not Saved", "ERROR", JOptionPane.ERROR_MESSAGE);
      }
      finally {
        if (writer != null) {
          try {
            writer.close();
          } catch (IOException x) {}
        }
      }
    }
  }

  // An action that reads the document as a serialized object
  class InAction extends AbstractAction {
    public InAction() {
      super("Serialize In", new ImageIcon("icons/open.gif"));
    }
    public void actionPerformed(ActionEvent ev) {
      JFileChooser chooser = new JFileChooser();
      if (chooser.showOpenDialog(IOStyledEditor.this) !=
          JFileChooser.APPROVE_OPTION)
        return;
      File file = chooser.getSelectedFile();
      if (file == null)
        return;
      FileInputStream reader = null;
      try {
        reader = new FileInputStream(file);
        ObjectInputStream ois = new ObjectInputStream(reader);
        Object o = ois.readObject();  // Read the document.
        getTextComponent().setDocument((Document)o);
      }
      catch (IOException ex) {
        JOptionPane.showMessageDialog(IOStyledEditor.this,
        "File Input Error", "ERROR", JOptionPane.ERROR_MESSAGE);
      }
      catch (ClassNotFoundException ex) {
        JOptionPane.showMessageDialog(IOStyledEditor.this,
        "Class Not Found", "ERROR", JOptionPane.ERROR_MESSAGE);
      }
      finally {
        if (reader != null) {
          try {
            reader.close();
          } catch (IOException x) {}
        }
      }
    }
  }
}