如何在 JTable 上添加复选框? [英] How can i add checkbox on my JTable?

问题描述

这是一个拖放 Java Swing

This is a Drag and Drop Java Swing

这是我的代码

prod.removeColumn(prod.getColumnModel().getColumn(0));

    String sql = "select prod_id,prod_description,prod_wh_name,prod_fr_name from product order by prod_description asc";
    PreparedStatement pst = con.prepareStatement(sql);
    ResultSet rs = pst.executeQuery();
    while(rs.next())
    {
        int columns = rs.getMetaData().getColumnCount();
        Object[] row = new Object[columns];
        for(int i = 1 ; i <=columns;i++)
        {
            row[i - 1] = rs.getObject(i);
        }
        ((DefaultTableModel) prod.getModel()).insertRow(rs.getRow() -1,row);
    }

我想在 jtable(Prod Description) 中每个数据的左侧添加一个复选框，有什么解决方案吗?并且可以选择多个?以及如何获取所选项目的数据?提前致谢！

I want to add a checkbox on the left side of every data in jtable(Prod Description), Any solution for that? and can select more than one? and how can i get the data of the selected item? Thanks in advance!

推荐答案

一种方法是创建一个包装器"TableModel.

One way is to create a "wrapper" TableModel.

在此示例中，包含复选标记的列将添加到任何现有 TableModel 中的列的左侧:

In this example a column containing check marks will be added to the left of the columns in any existing TableModel:

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;

public class CheckBoxWrapperTableModel extends AbstractTableModel
{
    private ArrayList<Boolean> checkBoxes = new ArrayList<>();

    private DefaultTableModel model;
    private String columnName;

    public CheckBoxWrapperTableModel(DefaultTableModel model, String columnName)
    {
        this.model = model;
        this.columnName = columnName;

        for (int i = 0; i < model.getRowCount(); i++)
            checkBoxes.add( Boolean.FALSE );
    }

    @Override
    public String getColumnName(int column)
    {
        return (column > 0) ? model.getColumnName(column - 1) : columnName;
    }

    @Override
    public int getRowCount()
    {
        return model.getRowCount();
    }

    @Override
    public int getColumnCount()
    {
        return model.getColumnCount() + 1;
    }

    @Override
    public Object getValueAt(int row, int column)
    {
        if (column > 0)
            return model.getValueAt(row, column - 1);
        else
        {
            Object value = checkBoxes.get(row);
            return (value == null) ? Boolean.FALSE : value;
        }
    }

    @Override
    public boolean isCellEditable(int row, int column)
    {
        if (column > 0)
            return model.isCellEditable(row, column - 1);
        else
            return true;
    }

    @Override
    public void setValueAt(Object value, int row, int column)
    {
        if (column > 0)
            model.setValueAt(value, row, column - 1);
        else
        {
            checkBoxes.set(row, (Boolean)value);
        }

        fireTableCellUpdated(row, column);
    }

    @Override
    public Class getColumnClass(int column)
    {
        return (column > 0) ? model.getColumnClass(column - 1) : Boolean.class;
    }

    public void removeRow(int row)
    {
        checkBoxes.remove(row);
        fireTableRowsDeleted(row, row);
        model.removeRow(row);
    }

    private static void createAndShowGUI()
    {
        //  Create the table with check marks in the first column

        DefaultTableModel model = new DefaultTableModel(5, 1);

        for (int i = 0; i < model.getRowCount(); i++)
        {
            model.setValueAt("" + i, i, 0);
        }

        CheckBoxWrapperTableModel wrapperModel = new CheckBoxWrapperTableModel(model, "Select");
        JTable table = new JTable(wrapperModel);

        //  Add button to delete selected rows

        JButton button = new JButton( "Delete Selected Rows" );
        button.addActionListener( new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
                for (int i = table.getRowCount() - 1; i >= 0; i--)
                {
                    Boolean selected = (Boolean)table.getValueAt(i, 0);
                    System.out.println(selected + " : " + i);

                    if (selected)
                    {
                        wrapperModel.removeRow(i);
                    }

                }
            }
        });

        JFrame frame = new JFrame("SSCCE");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( new JScrollPane( table ) );
        frame.add( button, BorderLayout.PAGE_END );
        frame.pack();
        frame.setLocationByPlatform( true );
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater( () -> createAndShowGUI() );
/*
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });
*/
    }
}

这允许您添加复选框，即使您在创建原始 TableModel 时无权访问它以添加您自己的复选框列.

This allows you to add the check box even if you don't have access to the original TableModel when it is created to add your own column of check boxes.

这篇关于如何在 JTable 上添加复选框?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！