我正在处理的程序有问题。简单解释一下，我有一个包含多列和多行的 JTable。当更改值时，特定列具有可编辑的字段，其他列值会根据输入的数据而更改。一切正常，但是当我向 JTable 添加过滤器选项时，对可编辑列所做的更改不会在应用过滤器后按预期更改其他列的值。我附上了几张图片来说明这个问题。
第一个图像显示未过滤的表正常工作。更改 Discount 列的值会将存储在 GPL 列中的相应价格减少输入折扣的百分比，并显示在 SP 列的相应行中。更改 Quantity 列的值会将相应的 SP 列价格乘以输入的数量，并显示在 Total 列的相应行中。
第二张图片显示过滤后的表格未按预期工作。更改 Discount 或 Quantity 列中的值不会更改预期的列。
我在下面添加了包含 2 个类的 SSCCE 代码。第一个是表本身，第二个是表的侦听器。
编辑我已经根据 camickr 的回答更改了课程的代码，现在可以正常工作了。
TableCellChange 类
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.KeyboardFocusManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.math.BigDecimal;
import java.math.MathContext;
import java.text.DecimalFormat;
import java.util.Locale;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.DefaultCellEditor;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.RowFilter;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;
public final class TableCellChange extends JPanel {
private static JFrame frameTableCellChange;
private JPanel panelTable, panelButtons;
private JButton buttonResetDiscounts, buttonResetQuantities, buttonExit;
private JTextField textFilterBox, quantityField, discountField;
private JLabel labelFilter;
private DefaultTableModel tableModel;
private JTable table;
private TableRowSorter<DefaultTableModel> sorter;
private TableColumn columnDiscount, columnTotal, columnQuantity;
private TableCellListener tableCellListener;
private String checkForNull;
private DecimalFormat decimalFormatUS;
private Locale localeUSFormat;
private BigDecimal valueDiscount, valueGPL, resultDiscount, resultSP, resultTotal,
backupDiscount = new BigDecimal("0");
private int selectedColumnIndex, selectedRowIndex, valueQuantity, backupQuantity = 1;
public TableCellChange() {
super();
panelTable = new JPanel();
panelButtons = new JPanel();
setLayout(new BorderLayout());
createTable();
createButtons();
add(panelTable, BorderLayout.NORTH);
add(panelButtons, BorderLayout.CENTER);
// Always focus on the JTextField when opening the window
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
textFilterBox.requestFocusInWindow();
}
});
} // -> TableCellChange()
// Create the buttons for the query result window
public void createButtons() {
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints gridcons = new GridBagConstraints();
gridcons.fill = GridBagConstraints.HORIZONTAL;
panelButtons.setLayout(gridbag);
labelFilter = new JLabel("Quick search:");
gridcons.insets = new Insets(5,0,0,0);
gridcons.gridx = 0;
gridcons.gridy = 0;
gridcons.gridwidth = 2;
gridbag.setConstraints(labelFilter, gridcons);
labelFilter.setHorizontalAlignment(JLabel.CENTER);
panelButtons.add(labelFilter);
// Create text field for filtering
textFilterBox = new JTextField();
gridcons.insets = new Insets(5,0,0,0);
gridcons.gridx = 0;
gridcons.gridy = 1;
gridcons.gridwidth = 2;
gridbag.setConstraints(textFilterBox, gridcons);
textFilterBox.getDocument().addDocumentListener(
new DocumentListener() {
@Override
public void changedUpdate(DocumentEvent e) {
tableFilter();
}
@Override
public void insertUpdate(DocumentEvent e) {
tableFilter();
}
@Override
public void removeUpdate(DocumentEvent e) {
tableFilter();
}
}); // -> DocumentListener()
panelButtons.add(textFilterBox);
// Create the button to reset the discount column to 0%
buttonResetDiscounts = new JButton("Reset all discounts");
buttonResetDiscounts.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e)
{
BigDecimal valueGPL, valueTotal;
int valueQuantity;
for (int i = 0; i < table.getModel().getRowCount(); i++) {
valueGPL = new BigDecimal( table.getModel().
getValueAt(i, 2).toString().replaceAll("[$,]", "") );
table.getModel().setValueAt("0%", i, 3);
table.getModel().setValueAt(DecimalFormat
.getCurrencyInstance(localeUSFormat).format(valueGPL), i, 4);
valueQuantity = Integer.parseInt( table.getModel().
getValueAt(i, 5).toString() );
valueTotal = valueGPL.multiply(new BigDecimal(valueQuantity),
new MathContext(BigDecimal.ROUND_HALF_EVEN));
table.getModel().setValueAt(DecimalFormat
.getCurrencyInstance(localeUSFormat).format(valueTotal), i, 6);
}
}
});
gridcons.insets = new Insets(10,0,0,0);
gridcons.gridx = 0;
gridcons.gridy = 3;
gridcons.gridwidth = 1;
gridbag.setConstraints(buttonResetDiscounts, gridcons);
panelButtons.add(buttonResetDiscounts);
// Create button to reset the quantity column to 1
buttonResetQuantities = new JButton("Reset all quantities");
buttonResetQuantities.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e)
{
BigDecimal valueSP;
for (int i = 0; i < table.getModel().getRowCount(); i++) {
valueSP = new BigDecimal( table.getModel().
getValueAt(i, 4).toString().replaceAll("[$,]", "") );
table.getModel().setValueAt("1", i, 5);
table.getModel().setValueAt(DecimalFormat.
getCurrencyInstance(localeUSFormat).format(valueSP), i, 6);
}
}
});
gridcons.insets = new Insets(10,0,0,0);
gridcons.gridx = 1;
gridcons.gridy = 3;
gridcons.gridwidth = 1;
gridbag.setConstraints(buttonResetQuantities, gridcons);
panelButtons.add(buttonResetQuantities);
// Create button for closing the window and releasing resources
buttonExit = new JButton("Exit");
buttonExit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
});
gridcons.insets = new Insets(5,0,0,0);
gridcons.gridx = 0;
gridcons.gridy = 5;
gridcons.gridwidth = 2;
gridbag.setConstraints(buttonExit, gridcons);
panelButtons.add(buttonExit);
} // -> createButtons()
// Filters the JTable based on user input
private void tableFilter() {
RowFilter<DefaultTableModel, Object> tableRowFilter;// = null;
// If current expression doesn't parse, don't update
try {
tableRowFilter = RowFilter.regexFilter("(?i)" + textFilterBox.
getText(), 0, 1, 2);
} catch (java.util.regex.PatternSyntaxException e) {
return;
}
sorter.setRowFilter(tableRowFilter);
} // -> tableFilter
// Method that creates the JTable
public void createTable() {
// Create listener for selecting all text when a text field gains focus
KeyboardFocusManager.getCurrentKeyboardFocusManager()
.addPropertyChangeListener("permanentFocusOwner", new PropertyChangeListener() {
@Override
public void propertyChange(final PropertyChangeEvent e) {
if (e.getNewValue() instanceof JTextField) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JTextField textField = (JTextField)e.getNewValue();
textField.selectAll();
}
});
}
}
});
String[] columnNames = {"Model", "Description", "GPL", "Discount", "SP",
"Quantity", "Total"};
Object[][] data = {
{"MR16", "desc1", "$649.00", "0%", "$649.00", new Integer(1), "$649.00"},
{"MR24", "desc2", "$1,199.00", "0%", "$1,199.00", new Integer(1), "1,199.00"},
{"MR62", "desc3", "$699.00", "0%", "$699.00", new Integer(1), "$699.00"},
{"MR66", "desc4", "$1,299.00", "0%", "$1,299.00", new Integer(1), "$1,299.00"},
{"MX80", "desc5", "$1,995.00", "0%", "$1,995.00", new Integer(1), "$1,995.00"},
{"MX90", "desc6", "$3,995.00", "0%", "$3,995.00", new Integer(1), "$3,995.00"},
{"MX400", "desc7", "$15,995.00", "0%", "$15,995.00", new Integer(1), "$15,995.00"},
{"MX600", "desc8", "$31,995.00", "0%", "$31,995.00", new Integer(1), "$31,995.00"},
{"MS22-HW", "desc9", "$1,999.00", "0%", "$1,999.00", new Integer(1), "$1,999.00"},
{"MS42-HW", "desc10", "$3,499.00", "0%", "$3,499.00", new Integer(1), "$3,499.00"},
};
// Create the TableModel and populate it
tableModel = new DefaultTableModel(data, columnNames) {
Class [] classes = {String.class, String.class, String.class,
String.class, String.class, int.class, String.class, Boolean.class};
@Override
public Class getColumnClass(int column) {
return classes[column];
}
};
// Create a JTable and populate it with the content of the TableModel
table = new JTable(tableModel) {
@Override
public boolean isCellEditable(int row, int column) {
if (column == 0 || column == 1 || column == 2 || column == 4 ||
column == 6) {
return false;
}
return true;
}
};
// This sorter is used for text filtering
sorter = new TableRowSorter<>(tableModel);
for (int column = 3; column < 6; column++) {
sorter.setSortable(column, false);
}
table.setRowSorter(sorter);
columnTotal= table.getColumnModel().getColumn(6);
columnTotal.setPreferredWidth(100);
// Filter user input in the quantity text field to only allow digits
discountField =new JTextField();
discountField.addKeyListener(new KeyAdapter() {
@Override
public void keyTyped(KeyEvent e)
{
if(!Character.isDigit(e.getKeyChar()) && e.getKeyChar() !=KeyEvent.VK_BACK_SPACE) {
discountField.setEditable(false);
discountField.setBackground(Color.WHITE);
} else {
discountField.setEditable(true);
}
}
});
// Set the text field to the cells of the quantity column
columnQuantity = table.getColumnModel().getColumn(5);
columnQuantity.setCellEditor(new DefaultCellEditor (discountField));
// Filter user input in the discount text field to only allow digits
quantityField =new JTextField();
quantityField.addKeyListener(new KeyAdapter() {
@Override
public void keyTyped(KeyEvent e)
{
if(!Character.isDigit(e.getKeyChar()) && e.getKeyChar() !=KeyEvent.VK_BACK_SPACE) {
quantityField.setEditable(false);
quantityField.setBackground(Color.WHITE);
//JOptionPane.showMessageDialog(null,"Only digit input is allowed!");
} else {
quantityField.setEditable(true);
}
}
});
// Set the text field to the cells of the quantity column
columnDiscount = table.getColumnModel().getColumn(3);
columnDiscount.setCellEditor(new DefaultCellEditor(discountField));
// Create an US number format
localeUSFormat = Locale.US;
decimalFormatUS = (DecimalFormat) DecimalFormat.getInstance(localeUSFormat);
decimalFormatUS.setMaximumFractionDigits(2);
// Create abstract action which listens for changes made in the JTable
Action actionTableListener = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
TableCellListener tcl = (TableCellListener)e.getSource();
// Get the current row and column index of the table
selectedRowIndex = tcl.getRow();
selectedColumnIndex = tcl.getColumn();
TableModel model = tcl.getTable().getModel();
// Have a string variable check for null cell value
checkForNull = model.getValueAt(selectedRowIndex,selectedColumnIndex).toString();
// Change the discounted and total price values
if (selectedColumnIndex == 3) {
// Check if the discount value is null and replace with
// last used value if true
if (checkForNull.equals("")) {
model.setValueAt(backupDiscount + "%",selectedRowIndex, selectedColumnIndex);
return;
}
// Get the discount value and replace the '%' with nothing
valueDiscount = new BigDecimal(( model
.getValueAt(selectedRowIndex,selectedColumnIndex)
.toString().replaceAll("[%]","") ));
//
model.setValueAt(valueDiscount + "%",selectedRowIndex, selectedColumnIndex);
// Check if the discount value is greater than 100
if ( (valueDiscount.compareTo(new BigDecimal(100)) == 1 ) ) {
model.setValueAt(backupDiscount + "%",selectedRowIndex, selectedColumnIndex);
JOptionPane.showMessageDialog(null,"Discount cannot be more than 100%.");
} else {
backupDiscount = valueDiscount;
valueDiscount = valueDiscount.divide(new BigDecimal(100)
, 2, BigDecimal.ROUND_HALF_EVEN);
// Calculate SP and Total values based on the discount input
valueGPL = new BigDecimal( ( model
.getValueAt(selectedRowIndex,selectedColumnIndex - 1)
.toString().replaceAll("[$,]","") ) );
// Get the quantity value
valueQuantity = Integer.parseInt( ( model
.getValueAt(selectedRowIndex,selectedColumnIndex + 2)
.toString() ) );
// Calculate the new discount value
resultDiscount = valueGPL.multiply(valueDiscount,
new MathContext(BigDecimal.ROUND_HALF_EVEN));
// Calculate the new SP value
resultSP = valueGPL.subtract(resultDiscount,
new MathContext(BigDecimal.ROUND_HALF_EVEN));
// Calculate the new result value
resultTotal = resultSP.multiply(new BigDecimal(valueQuantity),
new MathContext(BigDecimal.ROUND_HALF_EVEN));
// Display the new SP value
model.setValueAt(DecimalFormat.getCurrencyInstance(localeUSFormat)
.format(resultSP),selectedRowIndex, selectedColumnIndex + 1);
// Display the new Total value
model.setValueAt(DecimalFormat.getCurrencyInstance(localeUSFormat)
.format(resultTotal),selectedRowIndex, selectedColumnIndex + 3);
}
}
// Change the total price values based on the quantity column
if (selectedColumnIndex == 5) {
// Check if the quantity value is null and replace with
// last used value if true
if (checkForNull.equals("")) {
model.setValueAt(backupQuantity,selectedRowIndex, selectedColumnIndex);
return;
}
// Change total price value based on the quantity column
resultSP = new BigDecimal( ( model.
getValueAt(selectedRowIndex,
selectedColumnIndex - 1).toString().replaceAll("[$,]","") ) );
valueQuantity = Integer.parseInt( ( model.getValueAt(selectedRowIndex,
selectedColumnIndex).toString() ) );
// Check if the value quantity is over a certain limit
if (valueQuantity <= 0 || valueQuantity >= 999999) {
model.setValueAt(backupQuantity,selectedRowIndex, selectedColumnIndex);
JOptionPane.showMessageDialog(null,"Quantity value is too high or invalid!");
} else {
// If the value is under the limit: backup the new quantity
// value, calculate the new total value and display it
backupQuantity = valueQuantity;
resultTotal = resultSP.multiply(new BigDecimal(valueQuantity),
new MathContext(BigDecimal.ROUND_HALF_EVEN));
model.setValueAt(DecimalFormat.getCurrencyInstance(localeUSFormat)
.format(resultTotal), selectedRowIndex, selectedColumnIndex + 1);
}
}
}
}; // -> AbstractAction()
tableCellListener = new TableCellListener(table, actionTableListener);
table.setPreferredScrollableViewportSize(table.
getPreferredSize());
table.setRowHeight(22);
setVisibleRowCount(table,10);
table.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
table.setFillsViewportHeight(true);
table.getTableHeader().setReorderingAllowed(false);
table.getTableHeader().setResizingAllowed(false);
panelTable.add(new JScrollPane(table));
} // -> createTable()
// Method to display a fixed number of rows in the JTable viewport
public static void setVisibleRowCount(JTable table, int rows){
int height = 0;
for(int row=0; row<rows; row++) {
height += table.getRowHeight(row);
}
table.setPreferredScrollableViewportSize(new Dimension(
table.getPreferredScrollableViewportSize().width, height ));
}
// Create and display the contents of the frame
public static void showGUI() {
// Disable boldface controls
UIManager.put("swing.boldMetal", Boolean.FALSE);
// Create the frame
frameTableCellChange = new JFrame("Table frame");
frameTableCellChange.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frameTableCellChange.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent we) {
System.exit(0);
}
});
// Create and set up the content pane.
TableCellChange newContentPane = new TableCellChange();
newContentPane.setOpaque(true); //content panes must be opaque
frameTableCellChange.setContentPane(newContentPane);
// Arrange and display the window.
frameTableCellChange.pack(); //must be called first
frameTableCellChange.setLocationRelativeTo(null); //center window
frameTableCellChange.setResizable(false);
frameTableCellChange.setVisible(true);
} //-> showQueryResultGUI()
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.
UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException | InstantiationException |
IllegalAccessException |
javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(TableCellChange.class.getName()).
log(java.util.logging.Level.SEVERE, null, ex);
}
// Display the frame and it's contents
TableCellChange.showGUI();
}
});
} //-> main(String[] args)
} //-> TableCellChange class
编辑这个类是由 Rob Camick（又名 camickr）创建的，所有的功劳都归功于他创建了这段很棒的代码。为了遵守字符限制，仅从代码中删除了注释。
TableCellListener 类
import java.awt.event.ActionEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.Action;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
/*
* This class listens for changes made to the data in the table via the
* TableCellEditor. When editing is started, the value of the cell is saved
* When editing is stopped the new value is saved. When the old and new
* values are different, then the provided Action is invoked.
* The source of the Action is a TableCellListener instance.
*/
public class TableCellListener implements PropertyChangeListener, Runnable {
private JTable table;
private Action action;
private int row;
private int column;
private Object oldValue;
private Object newValue;
public TableCellListener(JTable table, Action action) {
this.table = table;
this.action = action;
this.table.addPropertyChangeListener(this);
}
private TableCellListener(JTable table, int row, int column, Object oldValue, Object newValue) {
this.table = table;
this.row = row;
this.column = column;
this.oldValue = oldValue;
this.newValue = newValue;
}
public int getColumn() {
return column;
}
public Object getNewValue() {
return newValue;
}
public Object getOldValue() {
return oldValue;
}
public int getRow() {
return row;
}
public JTable getTable() {
return table;
}
@Override
public void propertyChange(PropertyChangeEvent e) {
if ("tableCellEditor".equals(e.getPropertyName())) {
if (table.isEditing()) {
processEditingStarted();
} else {
processEditingStopped();
}
}
}
private void processEditingStarted() {
SwingUtilities.invokeLater(this);
}
@Override
public void run() {
row = table.convertRowIndexToView(table.getEditingRow());
row = table.getEditingRow();
column = table.convertColumnIndexToModel(table.getEditingColumn());
oldValue = table.getModel().getValueAt(row, column);
newValue = null;
}
private void processEditingStopped() {
newValue = table.getModel().getValueAt(row, column);
if (!newValue.equals(oldValue)) {
TableCellListener tcl = new TableCellListener(
getTable(), getRow(), getColumn(), getOldValue(), getNewValue());
ActionEvent event = new ActionEvent(
tcl,
ActionEvent.ACTION_PERFORMED,
"");
action.actionPerformed(event);
}
}
}
我知道在过滤表时，表视图的索引会发生变化，并且必须与底层模型的索引同步。为了使过滤表工作，如何做到这一点？