wrote:
>In my application, I perform serialization on my JTable's TableModel.
I ran your program as you posted it, and noted
the same effect you report, file size increasing
from an initial 8Kb, to 9.5, then 11.
Looking in the ser file, I noted a lot of cruft gets
serialised as well, so decided to try a run just
serializing the data.*
The size dropped to around 290-310 bytes (including
4 smallish values in the table data), but was still a little
'indefinite'.
Why not use XMLEncoder/Decoder instead?
The advantages are twofold.
- Serialization might well fail between class changes
(read as J2SE upgrades) - it is fragile.
- The XMLEncoder is optimized to store only what is
necessary, and will probably lead to a more predictable
file size.
* In any case, here is my variant that focuses on the
table data itself..
<sscce>
/*
* NewJFrame.java
*
* Created on April 8, 2007, 11:40 PM
*/
import java.io.*;
import javax.swing.table.*;
import java.util.Vector;
public class NewJFrame extends javax.swing.JFrame {
Vector columnIdents;
/** Creates new form NewJFrame */
public NewJFrame() {
initComponents();
loadTableModel();
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
// <editor-fold defaultstate="collapsed" desc=" Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
columnIdents = new Vector();
for (int ii=1; ii<5; ii++) {
columnIdents.addElement(
new String("Title " + (ii)));
}
Vector data = new Vector();
for (int ii=1; ii<5; ii++) {
data.add( new Vector(4) );
}
setDefaultCloseOperation(javax.swing.WindowConstan ts.DISPOSE_ON_CLOSE);
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosed(java.awt.event.WindowEvent evt) {
formWindowClosed(evt);
}
});
jTable1.setModel(new javax.swing.table.DefaultTableModel(
data, columnIdents
));
jScrollPane1.setViewportView(jTable1);
javax.swing.GroupLayout layout = new
javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1,
javax.swing.GroupLayout.PREFERRED_SIZE, 375,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(15, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1,
javax.swing.GroupLayout.PREFERRED_SIZE, 275,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(25, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void formWindowClosed(java.awt.event.WindowEvent evt)
{
// TODO add your handling code here:
saveTableModel();
System.out.println("table model saved");
}
private boolean saveTableModel() {
try {
FileOutputStream fos = new
FileOutputStream("table.ser", false);
ObjectOutputStream out = new ObjectOutputStream(fos);
out.writeObject(((DefaultTableModel)jTable1.
getModel()).getDataVector());
out.close();
}
catch(IOException exp) {
exp.printStackTrace();
return false;
}
return true;
}
private boolean loadTableModel() {
//TableModel tableModel = null;
Vector data = null;
try {
FileInputStream fos = new FileInputStream("table.ser");
ObjectInputStream in = new ObjectInputStream(fos);
//tableModel = (TableModel)in.readObject();
data = (Vector)in.readObject();
in.close();
}
catch(IOException exp) {
exp.printStackTrace();
return false;
}
catch(ClassNotFoundException exp) {
exp.printStackTrace();
return false;
}
//if(tableModel != null)
if(data != null) {
((DefaultTableModel)jTable1.getModel()).
setDataVector(data, columnIdents);
}
return true;
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTable jTable1;
// End of variables declaration
}
</sscce>
HTH
--
Andrew Thompson
http://www.athompson.info/andrew/
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http://www.javakb.com/Uwe/Forums.asp...neral/200704/1
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