JTable：检测单元数据的变化

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）：

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，我想获取旧值（可选）和该单元格的新值。

为了获得这些数据，我试图实现一个事件监听器：

  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); 

到目前为止这个工作。 但它还不能让我检测到这个细胞的旧值和新值。 还有什么我需要做的？

非常感谢你提前！

Answer 1

但它还不能让我检测到这个细胞的旧值和新值。 还有什么我需要做的？

使用TableModelListener监听更改更容易，但仍然存在无法访问旧值的问题。

查看表格单元侦听器以获取解决方案，该解决方案可让您访问“旧值”以及“新值”。

Answer 2

或具有ListSelectionListener的TableModelLister，如果TableCell发生更改，则返回第四个，从选定的调用返回第二个，然后仅使用ListSelectionListener比较TableModelLister中的行和列索引

 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 tbl = new Vector(); Vector 

Answer 3

mKorbel正在做点什么。 如果您创建自己的扩展DefaultCellEditor的单元格编辑器，该怎么办：

  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(); } });