JTable 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检索数据并将其放入表模型
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);
}
当前我正在使用此方法在更新表数据后刷新表。我将首先清除表
DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel();
tableModel.setRowCount(0);
,然后再次重构表模型,以便刷新 jTable。但我在想是否有任何最佳实践或更好的方法可以做到这一点?
This is my 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;
}
I will call this method to retrieve the data from database and put it into table model
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);
}
Currently I was using this method to refresh the table after updating the table data. I will first clear the table
DefaultTableModel tableModel = (DefaultTableModel) jTable.getModel();
tableModel.setRowCount(0);
and then restructure the table model again so it will refresh the jTable. But I was thinking is there any best practices or better way to do that?
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评论(6)
试试这个
try this
使用 java.util.Observable 和 java.util.Observer 会导致表更新不是更好吗?
Would it not be better to use
java.util.Observable
andjava.util.Observer
that will cause the table to update?我在我的 Jtable 中这样做了,它在 300 毫秒后自动刷新;
我怀疑它对于超过 500 个这样的大量对象会很好,唯一的方法是在你的类中实现 TableModelListener,但我不明白如何很好地使用它。看看 http://download.oracle.com/javase/tutorial /uiswing/components/table.html#modelchange
I did it like this in my Jtable its autorefreshing after 300 ms;
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
如果您想通知
JTable
有关数据的更改,请使用tableModel.fireTableDataChanged()
来自 文档:
If you want to notify your
JTable
about changes of your data, usetableModel.fireTableDataChanged()
From the documentation:
对于您的情况,更快的方法是:
当一个或几个单元格发生变化时的优化方法:
The faster way for your case is:
The optimized way when one or few cell change: