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。我已经设法添加我正在编辑/删除它们的记录。
我想在表格中显示现有记录,所以我使用 jTable。我在网上找到了一些代码并对其进行了修改以提取记录并将它们显示在 jtable 中,但我不知道如何编写右键单击代码并显示弹出菜单。
在那个弹出菜单中,我想显示删除记录和修改记录等选项。
这是我用来制作 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 新手,所以请善待您的回复。提前感谢大家的任何帮助!
最佳答案
这是一个关于如何做到这一点的示例。实现这一点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所在的行,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
}
});
关于java - jTable右键弹出菜单,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16743427/