我有一个SQL数据库，我正在开发一个允许我添加/删除/修改记录的程序。我已经设法添加了我正在编辑/删除它们的记录。
我想在表格中显示现有记录，因此我使用的是jTable。我在网上找到了一些代码并对其进行了修改以拉出记录并在jtable中显示它们但我不知道如何编写右键并显示弹出菜单。
在该弹出菜单中，我想显示删除记录和修改记录等选项。
这是我使用make jTable并显示数据的代码：
private void menuDeleteAuthorActionPerformed(java.awt.event.ActionEvent evt) {
TableFromDatabase deleteAuthor = new TableFromDatabase();
deleteAuthor.pack();
deleteAuthor.setVisible(true);
Vector columnNames = new Vector();
Vector data = new Vector();
try
{
Connection connection = DriverManager.getConnection( url, user, password );
// Read data from a table
String sql = "SELECT * FROM Authors";
Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery( sql );
ResultSetMetaData md = rs.getMetaData();
int columns = md.getColumnCount();
// Get column names
for (int i = 1; i <= columns; i++)
{
columnNames.addElement( md.getColumnName(i) );
}
// Get row data
while (rs.next())
{
Vector row = new Vector(columns);
for (int i = 1; i <= columns; i++)
{
row.addElement( rs.getObject(i) );
}
data.addElement( row );
}
rs.close();
stmt.close();
connection.close();
}
catch(Exception e)
{
System.out.println( e );
}
// Create table with database data
JTable table = new JTable(data, columnNames)
{
public Class getColumnClass(int column)
{
for (int row = 0; row < getRowCount(); row++)
{
Object o = getValueAt(row, column);
if (o != null)
{
return o.getClass();
}
}
return Object.class;
}
};
JScrollPane scrollPane = new JScrollPane( table );
getContentPane().add( scrollPane );
JPanel buttonPanel = new JPanel();
getContentPane().add( buttonPanel, BorderLayout.SOUTH );
}
我是Java的新手，所以请善意回复。提前感谢大家的帮助！
答案 0 :(得分：35)
这是一个如何做到这一点的例子。实现此目的的最简单方法是直接在JTable上设置JPopupMenu。
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Arrays;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
public class TestTableRightClick {
protected void initUI() {
final JFrame frame = new JFrame(TestTableRightClick.class.getSimpleName());
Vector<String> columns = new Vector<String>(Arrays.asList("Name", "Age"));
Vector<Vector<String>> data = new Vector<Vector<String>>();
for (int i = 0; i < 50; i++) {
Vector<String> row = new Vector<String>();
for (int j = 0; j < columns.size(); j++) {
row.add("Cell " + (i + 1) + "," + (j + 1));
}
data.add(row);
}
final JTable table = new JTable(data, columns);
final JPopupMenu popupMenu = new JPopupMenu();
JMenuItem deleteItem = new JMenuItem("Delete");
deleteItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(frame, "Right-click performed on table and choose DELETE");
}
});
popupMenu.add(deleteItem);
table.setComponentPopupMenu(popupMenu);
frame.add(new JScrollPane(table), BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new TestTableRightClick().initUI();
}
});
}
}
如果您想自动选择右键单击的行，请添加以下代码段：
popupMenu.addPopupMenuListener(new PopupMenuListener() {
@Override
public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
int rowAtPoint = table.rowAtPoint(SwingUtilities.convertPoint(popupMenu, new Point(0, 0), table));
if (rowAtPoint > -1) {
table.setRowSelectionInterval(rowAtPoint, rowAtPoint);
}
}
});
}
@Override
public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
// TODO Auto-generated method stub
}
@Override
public void popupMenuCanceled(PopupMenuEvent e) {
// TODO Auto-generated method stub
}
});
答案 1 :(得分：15)
JTable的一个问题是右键单击不会改变行选择。因此，如果您有一个适用于特定行的Action，则需要在右键单击该行之前先单击该行以显示弹出菜单。
如果您希望在右键单击的位置选择行，则可以使用以下代码：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TableRightClick extends JFrame implements ActionListener
{
JPopupMenu popup;
public TableRightClick()
{
popup = new JPopupMenu();
popup.add( new JMenuItem("Do Something1") );
popup.add( new JMenuItem("Do Something2") );
popup.add( new JMenuItem("Do Something3") );
JMenuItem menuItem = new JMenuItem("ActionPerformed");
menuItem.addActionListener( this );
popup.add( menuItem );
JTable table = new JTable(50, 5);
table.addMouseListener( new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
System.out.println("pressed");
}
public void mouseReleased(MouseEvent e)
{
if (e.isPopupTrigger())
{
JTable source = (JTable)e.getSource();
int row = source.rowAtPoint( e.getPoint() );
int column = source.columnAtPoint( e.getPoint() );
if (! source.isRowSelected(row))
source.changeSelection(row, column, false, false);
popup.show(e.getComponent(), e.getX(), e.getY());
}
}
});
table.setPreferredScrollableViewportSize(table.getPreferredSize());
getContentPane().add( new JScrollPane(table) );
}
public void actionPerformed(ActionEvent e)
{
Component c = (Component)e.getSource();
JPopupMenu popup = (JPopupMenu)c.getParent();
JTable table = (JTable)popup.getInvoker();
System.out.println(table.getSelectedRow() + " : " + table.getSelectedColumn());
}
public static void main(String[] args)
{
TableRightClick frame = new TableRightClick();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setLocationRelativeTo( null );
frame.setVisible( true );
}
}
答案 2 :(得分：0)
另一个问题是上下文菜单是动态的，您的解决方案不涉及根据点击的行更改菜单
popupMenu.addPopupMenuListener(new PopupMenuListener()
{
@Override
public void popupMenuWillBecomeVisible(PopupMenuEvent e) // juste pour selectionner la row quant on right click, putain de swing de merde
{
int rowAtPoint = table.rowAtPoint(SwingUtilities.convertPoint(popupMenu, new Point(0, 0), table));
generateTablePopupMenu(rowAtPoint); <<<<<<<<<<<< here
SwingUtilities.invokeLater(new Runnable()
...