如何在插入删除或更新数据后刷新表模型。

这是我的 jTable

private JTable getJTable() {
String[] colName = { "Name", "Email", "Contact No. 1", "Contact No. 2",
"Group", "" };
if (jTable == null) {
jTable = new JTable() {
public boolean isCellEditable(int nRow, int nCol) {
return false;
}
};
}
DefaultTableModel contactTableModel = (DefaultTableModel) jTable
.getModel();
contactTableModel.setColumnIdentifiers(colName);
jTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
return jTable;
}

我将调用此方法从数据库中检索数据并将其放入表模型中

public void setUpTableData() {
DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel();
ArrayList<Contact> list = new ArrayList<Contact>();
if (!con.equals(""))
list = sql.getContactListsByGroup(con);
else
list = sql.getContactLists();
for (int i = 0; i < list.size(); i++) {
String[] data = new String[7];


data[0] = list.get(i).getName();
data[1] = list.get(i).getEmail();
data[2] = list.get(i).getPhone1();
data[3] = list.get(i).getPhone2();
data[4] = list.get(i).getGroup();
data[5] = list.get(i).getId();


tableModel.addRow(data);
}
jTable.setModel(tableModel);
}

目前，我使用这种方法在更新表数据之后刷新表。我先收拾桌子

DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel();
tableModel.setRowCount(0);

然后再次重新构造表模型，以便刷新 jTable。但是我在想有没有什么最佳实践或者更好的方法来做到这一点呢？

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小开
最佳答案

If you want to notify your JTable about changes of your data, use
tableModel.fireTableDataChanged()

From the documentation:

Notifies all listeners that all cell values in the table's rows may have changed. The number of rows may also have changed and the JTable should redraw the table from scratch. The structure of the table (as in the order of the columns) is assumed to be the same.

小开

I did it like this in my Jtable its autorefreshing after 300 ms;

DefaultTableModel tableModel = new DefaultTableModel(){
public boolean isCellEditable(int nRow, int nCol) {
return false;
}
};
JTable table = new JTable();


Timer t = new Timer(300, new ActionListener() {


@Override
public void actionPerformed(ActionEvent e) {
addColumns();
remakeData(set);
table.setModel(model);
}
});
t.start();


private void addColumns() {
model.setColumnCount(0);
model.addColumn("NAME");
model.addColumn("EMAIL");}


private void remakeData(CollectionType< Objects > name) {
model.setRowCount(0);
for (CollectionType Objects : name){
String n = Object.getName();
String e = Object.getEmail();
model.insertRow(model.getRowCount(),new Object[] { n,e });
}}

I doubt it will do good with large number of objects like over 500, only other way is to implement TableModelListener in your class, but i did not understand how to use it well. look at http://download.oracle.com/javase/tutorial/uiswing/components/table.html#modelchange

小开

Would it not be better to use java.util.Observable and java.util.Observer that will cause the table to update?

小开

The faster way for your case is:

    jTable.repaint(); // Repaint all the component (all Cells).

The optimized way when one or few cell change:

    ((AbstractTableModel) jTable.getModel()).fireTableCellUpdated(x, 0); // Repaint one cell.
小开

try this

public void setUpTableData() {
DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel();


/**
* additional code.
**/
tableModel.setRowCount(0);
/**/
ArrayList<Contact> list = new ArrayList<Contact>();
if (!con.equals(""))
list = sql.getContactListsByGroup(con);
else
list = sql.getContactLists();
for (int i = 0; i < list.size(); i++) {
String[] data = new String[7];


data[0] = list.get(i).getName();
data[1] = list.get(i).getEmail();
data[2] = list.get(i).getPhone1();
data[3] = list.get(i).getPhone2();
data[4] = list.get(i).getGroup();
data[5] = list.get(i).getId();


tableModel.addRow(data);
}
jTable.setModel(tableModel);
/**
* additional code.
**/
tableModel.fireTableDataChanged();
/**/
}

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