Java 在jtable中刷新一行的背景色
我正在尝试设置Swing Jtable的行的颜色。我用这个类来扩展Jtable，就像网上建议的那样。
public class ColorTable extends JTable { private static final long serialVersionUID = 1L;
private Map rowColor = new HashMap();
private Map columnColor = new HashMap();
private Color cellColor;
private Color defaultColor;
public ColorTable( TableModel model ) {
super( model );
}
public void setRowColor( int row, Color c) {
rowColor.put( new Integer( row ), c );
}
public void setColumnColor( int column, Color c ) {
columnColor.put( new Integer( column ), c );
}
public void setCellColor( Color c ) {
cellColor = c;
}
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
public Component prepareRenderer( TableCellRenderer renderer, int row, int column ) {
Component c = super.prepareRenderer( renderer, row, column );
if ( defaultColor == null )
defaultColor = c.getBackground();
// Color order is as follows:
// rowSelection, checkBox toggle for row color, column color, cell color
if ( ! isRowSelected( row ) ) {
Color color = (Color) rowColor.get( new Integer( row ) );
if ( color == null || Boolean.FALSE.equals( getModel().getValueAt( row, 0 ) ) )
color = (Color) columnColor.get( new Integer( column ) );
if ( color == null ) {
// cell color only if cell has special value, for example purposes,
// if the cell value begins with a 2
Object value = getValueAt( row, column );
if ( value != null && value.toString().startsWith( "2" ) )
color = cellColor;
}
if ( color != null )
c.setBackground( color );
else
c.setBackground( defaultColor );
}
return c;
}
public void resetColor(Color color) {
for(int i=0;i<this.getRowCount();i++)
this.setRowColor(i, color);
}
}
我只是添加了方法resetColor（Color color）来初始化所有具有相同颜色的行。
它在第一次使用时就可以正常工作，但是当我想更改颜色时会遇到问题。例如，如果我在按钮动作侦听器中执行以下代码，则仅在第一次迭代时就为表正确上色，而之后再也不会更改背景。
deployTable.resetColor(Color.green);// set red background to the
for (Integer x : indexes) {
System.out.println("index "+x+" red!");
deployTable.setRowColor(x, Color.red);
}
deployTable.revalidate();
有谁知道这可能是什么？
谢谢，Ste
回答：
例如，
import java.awt.*;import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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 JButton blueButton;
private ListSelectionModel lsDialog;
private Color clr;
private Color clr1;
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);
comp.setForeground(Color.black);
if ((type) && (!type1)) {
comp.setBackground(clr1);
} else if ((!type) && (type1)) {
comp.setBackground(Color.orange);
} else if ((!type) || (!type1)) {
comp.setBackground(Color.red);
} else {
comp.setBackground(row % 2 == 0 ? getBackground() : getBackground().darker());
}
dialogTable.convertRowIndexToView(0);
} else {
comp.setForeground(Color.blue);
}
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);
blueButton = new JButton(" Blue BackGround ");
blueButton.setPreferredSize(new Dimension(100, 30));
blueButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (clr == Color.white) {
clr = Color.orange;
clr1 = Color.yellow;
} else {
clr = Color.white;
clr1 = Color.black;
}
System.out.println(clr);
dialogTable.setBackground(clr);
dialogTable.repaint();
}
});
fatherCenter = new JPanel();
fatherCenter.setLayout(new BorderLayout(10, 10));
fatherCenter.add(tableScroll, BorderLayout.CENTER);
fatherCenter.add(blueButton, BorderLayout.SOUTH);
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();
this.fireTableRowsInserted(data.size() - 1, data.size() - 1);
}
public void removeRowAt(int row) {
this.data.removeElementAt(row);
//this.fireTableDataChanged();
this.fireTableRowsDeleted(row - 1, data.size() - 1);
}
@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();
}
}
}
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