Как написать состояние JTable с данными в XML-файле с использованием XMLEndcoder в java

Question

Я хочу сохранить JTable в xml-файле, используя XMLEncoder. Когда мы спасаем его в файл, получаю исключение:

java.lang.InstantiationException: javax.swing.plaf.basic.BasicTableUI$Handler 
Continuing ... 
java.lang.Exception: XMLEncoder: discarding statement ColorPropertyTable.removeMouseMotionListener(BasicTableUI$Handler); 
Continuing ... 

Answer 1

http://java.sun.com/products/jfc/tsc/articles/persistence4/
http://www.oracle.com/technetwork/java/persistence4-140124.html
Регистрация для исключения Уведомления
Оба XMLEncoder и XMLDecoder перехватывать исключения и, как правило, в состоянии оправиться от их, позволяя частям архива не влиять на исключение, которое должно быть записано или прочитано. Вы можете узнать больше о каких-либо исключений, поднятым в процессах кодирования и декодирования путем регистрации ExceptionListener следующим образом:
...

Пример

import java.awt.*; 
import java.awt.event.*; 
import java.beans.*; 
import java.io.*; 
import java.util.Vector; 
import javax.swing.*; 
import javax.swing.table.*; 

public class DefaultTableModelPersistenceDelegateTest { 
    private final JTextArea textArea = new JTextArea(); 

    private final String[] columnNames = {"A", "B"}; 
    private final Object[][] data = { 
    {"aaa", "ccccccc"}, {"bbb", "\u2600\u2601\u2602\u2603"} 
    }; 
    private DefaultTableModel model = new DefaultTableModel(data, columnNames); 
    private final JTable table = new JTable(model); 

    public JComponent makeUI() { 
    JSplitPane sp = new JSplitPane(JSplitPane.VERTICAL_SPLIT); 
    sp.setResizeWeight(.5); 
    sp.setTopComponent(new JScrollPane(table)); 
    sp.setBottomComponent(new JScrollPane(textArea)); 

    JPanel p = new JPanel(); 
    p.add(new JButton(new AbstractAction("XMLEncoder") { 
     @Override public void actionPerformed(ActionEvent e) { 
     try { 
      File file = File.createTempFile("output", ".xml"); 
      try (OutputStream os = new BufferedOutputStream(new FileOutputStream(file))) { 
      XMLEncoder xe = new XMLEncoder(os); 
      xe.setPersistenceDelegate(
       DefaultTableModel.class, new DefaultTableModelPersistenceDelegate()); 
//   xe.setExceptionListener(new ExceptionListener() { 
//    @Override public void exceptionThrown(Exception exception) { 
//     //XXX: exception.printStackTrace(); 
//    } 
//   }); 
//   xe.writeObject(table); 
      xe.writeObject(model); 
      //xe.flush(); 
      xe.close(); 
      } 
      try (Reader r = new BufferedReader(
       new InputStreamReader(new FileInputStream(file), "UTF-8"))) { 
      textArea.read(r, "temp"); 
      } 
     } catch (IOException ex) { 
      ex.printStackTrace(); 
     } 
     } 
    })); 
    p.add(new JButton(new AbstractAction("XMLDecoder") { 
     @Override public void actionPerformed(ActionEvent e) { 
     try (InputStream is = new BufferedInputStream(
      new ByteArrayInputStream(textArea.getText().getBytes("UTF-8")))) { 
      XMLDecoder xd = new XMLDecoder(is); 
      model = (DefaultTableModel) xd.readObject(); 
      table.setModel(model); 
     } catch (IOException ex) { 
      ex.printStackTrace(); 
     } 
     } 
    })); 
    p.add(new JButton(new AbstractAction("clear") { 
     @Override public void actionPerformed(ActionEvent e) { 
     model = new DefaultTableModel(); 
     table.setModel(model); 
     } 
    })); 

    JPanel pnl = new JPanel(new BorderLayout()); 
    pnl.add(sp); 
    pnl.add(p, BorderLayout.SOUTH); 
    return pnl; 
    } 
    public static void main(String[] args) { 
    EventQueue.invokeLater(new Runnable() { 
     @Override public void run() { 
     createAndShowGUI(); 
     } 
    }); 
    } 
    public static void createAndShowGUI() { 
    JFrame f = new JFrame(); 
    f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
    f.getContentPane().add(new DefaultTableModelPersistenceDelegateTest().makeUI()); 
    f.setSize(320, 240); 
    f.setLocationRelativeTo(null); 
    f.setVisible(true); 
    } 
} 
//http://web.archive.org/web/20090806075316/http://java.sun.com/products/jfc/tsc/articles/persistence4/ 
//http://www.oracle.com/technetwork/java/persistence4-140124.html 
class DefaultTableModelPersistenceDelegate extends DefaultPersistenceDelegate { 
    @Override protected void initialize(
     Class<?> type, Object oldInstance, Object newInstance, Encoder encoder) { 
    super.initialize(type, oldInstance, newInstance, encoder); 
    DefaultTableModel m = (DefaultTableModel) oldInstance; 
//   Vector v = m.getDataVector(); 
//   for (int i = 0; i < m.getRowCount(); i++) { 
//    encoder.writeStatement(
//    new Statement(oldInstance, "addRow", new Object[] { (Vector) v.get(i) })); 
//   } 
    for (int row = 0; row < m.getRowCount(); row++) { 
     for (int col = 0; col < m.getColumnCount(); col++) { 
     Object[] o = new Object[] {m.getValueAt(row, col), row, col}; 
     encoder.writeStatement(new Statement(oldInstance, "setValueAt", o)); 
     } 
    } 
    } 
} 

Answer 2

Этот ответ основан на примере атерая. Это немного более полной, потому что он также будет сохраняться имена столбцов:

import java.awt.*; 
import java.awt.event.*; 
import java.beans.*; 
import java.io.*; 
import java.util.Vector; 
import javax.swing.*; 
import javax.swing.table.*; 

public class DefaultTableModelPersistenceDelegateTest 
{ 
    private File file = new File("TableModel.xml"); 
    private final JTextArea textArea = new JTextArea(); 

    private final String[] columnNames = {"Column1", "Column2"}; 

    private final Object[][] data = 
    { 
     {"aaa", new Integer(1)}, 
     {"bbb\u2600", new Integer(2)} 
    }; 

    private DefaultTableModel model = new DefaultTableModel(data, columnNames); 
    private final JTable table = new JTable(model); 

    public JComponent makeUI() 
    { 
     model.setColumnCount(5); 
     JSplitPane sp = new JSplitPane(JSplitPane.VERTICAL_SPLIT); 
     sp.setResizeWeight(.3); 
     sp.setTopComponent(new JScrollPane(table)); 
     sp.setBottomComponent(new JScrollPane(textArea)); 

     JPanel p = new JPanel(); 
     p.add(new JButton(new AbstractAction("XMLEncoder") 
     { 
      @Override 
      public void actionPerformed(ActionEvent e) 
      { 
       try 
       { 
        OutputStream os = new BufferedOutputStream(new FileOutputStream(file)); 
        XMLEncoder xe = new XMLEncoder(os); 
        xe.setPersistenceDelegate(DefaultTableModel.class, new DefaultTableModelPersistenceDelegate2()); 
        xe.writeObject(model); 
        xe.close(); 

        Reader r = new BufferedReader(new InputStreamReader(new FileInputStream(file), "UTF-8")); 
        textArea.read(r, null); 
       } 
       catch (IOException ex) 
       { 
        ex.printStackTrace(); 
       } 
      } 
     })); 

     p.add(new JButton(new AbstractAction("XMLDecoder") 
     { 
      @Override 
      public void actionPerformed(ActionEvent e) 
      { 
       try 
       { 
        InputStream is = new BufferedInputStream(new FileInputStream(file)); 
        XMLDecoder xd = new XMLDecoder(is); 
        model = (DefaultTableModel)xd.readObject(); 
        table.setModel(model); 
       } 
       catch (IOException ex) 
       { 
        ex.printStackTrace(); 
       } 
      } 
     })); 

     p.add(new JButton(new AbstractAction("clear") 
     { 
      @Override 
      public void actionPerformed(ActionEvent e) 
      { 
       model = new DefaultTableModel(); 
       table.setModel(model); 
      } 
     })); 

     JPanel pnl = new JPanel(new BorderLayout()); 
     pnl.add(sp); 
     pnl.add(p, BorderLayout.SOUTH); 
     return pnl; 
    } 

    public static void main(String[] args) 
    { 
     EventQueue.invokeLater(new Runnable() 
     { 
      @Override public void run() 
      { 
       createAndShowGUI(); 
      } 
     }); 
    } 

    public static void createAndShowGUI() 
    { 
     JFrame f = new JFrame(); 
     f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
     f.getContentPane().add(new DefaultTableModelPersistenceDelegateTest().makeUI()); 
     f.setSize(420, 340); 
     f.setLocationRelativeTo(null); 
     f.setVisible(true); 
    } 
} 

//http://www.oracle.com/technetwork/java/persistence4-140124.html 

class DefaultTableModelPersistenceDelegate extends DefaultPersistenceDelegate 
{ 
    // Initially creates an empty DefaultTableModel. The columns are created 
    // and finally each row of data is added to the model. 

    @Override 
    protected void initialize(Class<?> type, Object oldInstance, Object newInstance, Encoder encoder) 
    { 
     DefaultTableModel model= (DefaultTableModel)oldInstance; 

     Vector<String> columnNames = new Vector<String>(model.getColumnCount()); 

     for (int i = 0; i < model.getColumnCount(); i++) 
     { 
      columnNames.add(model.getColumnName(i)); 
     } 

     Object[] columnNamesData = new Object[] { columnNames }; 
     encoder.writeStatement(new Statement(oldInstance, "setColumnIdentifiers", columnNamesData)); 

     Vector row = model.getDataVector(); 

     for (int i = 0; i < model.getRowCount(); i++) 
     { 
      Object[] rowData = new Object[] { row.get(i) }; 
      encoder.writeStatement(new Statement(oldInstance, "addRow", rowData)); 
     } 
    } 
}