JTable中右击弹出菜单 [英] jTable right-click popup menu

问题描述

我有一个SQL数据库和我工作的一个程序，将允许我添加/删除/修改记录。我已经设法增加我的编辑工作记录/删除它们。

I have a SQL database and I am working on a program that will allow me to add/delete/modify records. I already managed to add records I am working on editing/deleting them.

我想，所以我使用的JTable在表中显示现有的记录。我发现了一些code在线和修改它拉记录和JTable中显示出来，但我不知道如何code中的单击鼠标右键，并显示一个弹出菜单。

I want to display the existing records in a table so I am using jTable. I found some code online and modified it to pull the records and display them in a jtable but i dont know how to code the rightclick and display a popup menu.

在弹出菜单中我想显示的选项，如删除记录，修改记录。

In that popup menu I want to display options such as delete record and modify record.

这是code，我使用make JTable中并显示数据：

This is the code I am using the make the jTable and display the data:

 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 );
}

我是新来的Java所以请善待你的反应。谢谢大家提前任何帮助！

I am new to Java so please be kind in your responses. Thank you all in advance for any assistance!

推荐答案

下面是如何做到这一点的例子。实现这一目标最简单的方法，就是设置一个的JP​​opupMenu 在JTable中直接。

Here is an example on how to do that. The easiest way to achieve this, is to set a JPopupMenu on the JTable directly.

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();
            }
        });
    }
}

如果你要自动选择其中右击被做了行，添加以下代码片段：

In case you want to automatically select the row where the right-click was made, add the following snippet:

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

            }
        });

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