在Netbeans中，我使用GUI Builder将JTable插入到我的应用程序中。
到目前为止，我只有一个类(CustomerDB)，它是:package CustomerDB;
import [...];
public class CustomerDB extends javax.swing.JFrame {
CellEditorListener ChangeNotification = new CellEditorListener() {
public void editingCanceled(ChangeEvent e) {
System.out.println("The user canceled editing.");
}
public void editingStopped(ChangeEvent e) {
System.out.println("The user stopped editing successfully.");
}
};
public CustomerDB() {
customerTable = new javax.swing.JTable();
customerTable.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
},
new String [] {
"ID", "Name", "Address", "Phone"
}
) {
Class[] types = new Class [] {
java.lang.String.class, java.lang.String.class, java.lang.String.class, java.lang.String.class
};
public Class getColumnClass(int columnIndex) {
return types [columnIndex];
}
});
customerTable.getDefaultEditor(String.class).addCellEditorListener(ChangeNotification);
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new CustomerDB().setVisible(true);
}
});
}
// Variables declaration - do not modify
[...]
private javax.swing.JTable customerTable;
[...]
// End of variables declaration
}
每当用户更改表中的数据时，我希望获得该单元格的旧值(可选)和新值。
为了获得这些数据，我尝试实现一个事件侦听器:
CellEditorListener ChangeNotification = new CellEditorListener() {
public void editingCanceled(ChangeEvent e) {
System.out.println("The user canceled editing.");
}
public void editingStopped(ChangeEvent e) {
System.out.println("The user stopped editing successfully.");
}
};
然后我将这个CellEditorListener分配给表(它的单元格编辑器):
customerTable.getDefaultEditor(String.class).addCellEditorListener(ChangeNotification);
目前为止还可以。但它还不能让我检测到这个细胞的新旧值。我还需要做什么?
提前非常感谢!
但是它还不能让我检测到这个单元格的旧值和新值。我还需要做什么?
使用TableModelListener侦听更改更容易，但它仍然存在无法访问旧值的问题。
查看Table Cell Listener，找到一个既能访问"旧值"又能访问"新值"的解决方案。
或TableModelLister与ListSelectionListener，首先返回如果TableCell改变，第二从选定调用，然后只是比较行&使用ListSelectionListener从TableModelLister中获取列索引
import java.awt.*;
import java.util.Random;
import java.util.Vector;
import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;
public class Forum implements ListSelectionListener {
private JFrame frame = new JFrame("Frame");
private JPanel fatherCenter = new JPanel();
private JScrollPane tableScroll = new JScrollPane();
private myTableModel tableModel;
private JTable dialogTable;
private ListSelectionModel lsDialog;
private void addComponentsToPane(Container pane) {
tableModel = new myTableModel();
dialogTable = new JTable(tableModel) {
private static final long serialVersionUID = 1L;
@Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
Component comp = super.prepareRenderer(renderer, row, column);
JComponent jc = (JComponent) comp;//for Custom JComponent
if (!isRowSelected(row)) {
int modelRow = convertRowIndexToModel(row);
boolean type = (Boolean) getModel().getValueAt(modelRow, 2);
boolean type1 = (Boolean) getModel().getValueAt(modelRow, 3);
boolean type2 = (Boolean) getModel().isCellEditable(row, column);
comp.setForeground(Color.black);
if ((type) && (!type1)) {
comp.setBackground(Color.yellow);
} else if ((!type) && (type1)) {
comp.setBackground(Color.orange);
} else if ((!type) || (!type1)) {
comp.setBackground(Color.red);
//} else if ((!type2)) {
//comp.setForeground(Color.red);
//comp.setBackground(Color.magenta);
} else {
comp.setBackground(row % 2 == 0 ? getBackground() : getBackground().darker());
}
dialogTable.convertRowIndexToView(0);
} else {
comp.setForeground(Color.blue);
comp.setBackground(Color.lightGray);
}
if (!isCellEditable(row, column)) {
comp.setForeground(Color.red);
comp.setBackground(Color.magenta);
}
return comp;
}
};
tableScroll = new JScrollPane(dialogTable, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
tableScroll.setBorder(null);
dialogTable.getTableHeader().setReorderingAllowed(false);
dialogTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
lsDialog = dialogTable.getSelectionModel();
dialogTable.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
dialogTable.setRowHeight(20);
dialogTable.setRowMargin(2);
ListSelectionModel rowSelMod = dialogTable.getSelectionModel();
//ListSelectionModel colSelMod = dialogTable.getColumnModel().getSelectionModel();
rowSelMod.addListSelectionListener(this);
//colSelMod.addListSelectionListener(this);
fatherCenter = new JPanel();
fatherCenter.setLayout(new BorderLayout(10, 10));
fatherCenter.add(tableScroll, BorderLayout.CENTER);
pane.add(fatherCenter);
}
private void addData() {
Runnable doRun1 = new Runnable() {
@Override
public void run() {
tableModel.resetTable();
Vector<String> tbl = new Vector<String>();
Vector<Object> tbl1 = new Vector<Object>();
Random rnd = new Random();
tbl.add("Integer");
tbl.add("Double");
tbl.add("Boolean");
tbl.add("Boolean");
tbl.add("String");
tableModel.setColumnNames(tbl);
for (int row = 0; row < 30; row++) {
tbl1 = null;
tbl1 = new Vector<Object>();
tbl1.addElement(row + 1);
tbl1.addElement(rnd.nextInt(25) + 3.14);
tbl1.addElement((row % 3 == 0) ? false : true);
tbl1.addElement((row % 5 == 0) ? false : true);
if (row % 7 == 0) {
tbl1.add(("Canc"));
} else if (row % 6 == 0) {
tbl1.add(("Del"));
} else {
tbl1.add(("New"));
}
tableModel.addRow(tbl1);
}
addTableListener();
}
};
SwingUtilities.invokeLater(doRun1);
}
private void addTableListener() {
tableModel.addTableModelListener(new TableModelListener() {
@Override
public void tableChanged(TableModelEvent tme) {
if (tme.getType() == TableModelEvent.UPDATE) {
System.out.println("");
System.out.println("Cell " + tme.getFirstRow() + ", "
+ tme.getColumn() + " changed. The new value: "
+ tableModel.getValueAt(tme.getFirstRow(),
tme.getColumn()));
}
}
});
}
public void valueChanged(ListSelectionEvent le) {
int row = dialogTable.getSelectedRow();
int col = dialogTable.getSelectedColumn();
String str = "Selected Row(s): ";
int[] rows = dialogTable.getSelectedRows();
for (int i = 0; i < rows.length; i++) {
str += rows[i] + " ";
}
str += "Selected Column(s): ";
int[] cols = dialogTable.getSelectedColumns();
for (int i = 0; i < cols.length; i++) {
str += cols[i] + " ";
}
str += "Selected Cell: " + dialogTable.getSelectedRow() + ", " + dialogTable.getSelectedColumn();
System.out.println(str);
Object value = dialogTable.getValueAt(row, col);
System.out.println(String.valueOf(value));
}
private void createAndShowGUI() {
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout(10, 10));
addComponentsToPane(frame.getContentPane());
addData();
frame.setLocation(150, 150);
frame.setPreferredSize(new Dimension(400, 647));
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
Forum osFrame = new Forum();
}
public Forum() {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowGUI();
}
});
}
private class myTableModel extends AbstractTableModel {
private static final long serialVersionUID = 1L;
private Vector<Vector<Object>> data;
private Vector<String> colNames;
private boolean[] _columnsVisible = {true, true, true, true, true};
myTableModel() {
this.colNames = new Vector<String>();
this.data = new Vector<Vector<Object>>();
}
myTableModel(Vector<String> colnames) {
this.colNames = colnames;
this.data = new Vector<Vector<Object>>();
}
public void resetTable() {
this.colNames.removeAllElements();
this.data.removeAllElements();
}
public void setColumnNames(Vector<String> colNames) {
this.colNames = colNames;
this.fireTableStructureChanged();
}
public void addRow(Vector<Object> data) {
this.data.add(data);
this.fireTableDataChanged();
this.fireTableStructureChanged();
}
public void removeRowAt(int row) {
this.data.removeElementAt(row);
this.fireTableDataChanged();
}
@Override
public int getColumnCount() {
return this.colNames.size();
}
@Override
public Class<?> getColumnClass(int colNum) {
switch (colNum) {
case 0:
return Integer.class;
case 1:
return Double.class;
case 2:
return Boolean.class;
case 3:
return Boolean.class;
default:
return String.class;
}
}
@Override
public boolean isCellEditable(int row, int colNum) {
switch (colNum) {
case 2:
return false;
default:
return true;
}
}
@Override
public String getColumnName(int colNum) {
return this.colNames.get(colNum);
}
@Override
public int getRowCount() {
return this.data.size();
}
@Override
public Object getValueAt(int row, int col) {
Vector<Object> value = this.data.get(row);
return value.get(col);
}
@Override
public void setValueAt(Object newVal, int row, int col) {
Vector<Object> aRow = data.elementAt(row);
aRow.remove(col);
aRow.insertElementAt(newVal, col);
fireTableCellUpdated(row, col);
}
public void setColumnVisible(int index, boolean visible) {
this._columnsVisible[index] = visible;
this.fireTableStructureChanged();
}
}
}
mKorbel说对了。如果您创建自己的单元格编辑器，扩展defaultcellleditor:
customerTable.setDefaultEditor(String.class, new DefaultCellEditor(new JTextField()){
@Override
public Component getTableCellEditorComponent(JTable table,
Object value, boolean isSelected, int row, int column) {
// code on line below is redundant but would be needed if need to see
// other property of the value object than toString()
String valueStr = (value == null) ? "null" : value.toString();
System.out.printf("[%d, %d]: %s%n", row, column, valueStr);
return super.getTableCellEditorComponent(table, value, isSelected, row, column);
}
@Override
public Object getCellEditorValue() {
System.out.printf("cell editor value: %s%n", super.getCellEditorValue());
return super.getCellEditorValue();
}
});