选择时显示JTable行的信息 [英] Display the information of a JTable row when selected

问题描述

选择后如何显示JTable行的信息?

How do I display the information of a JTable row when selected?

我将简要解释我要做什么，然后发布我创建的SSCCE，以防万一我的解释令人困惑.

I'll briefly explain what I am trying to do and then post the SSCCE that I created in case any of my explanation is confusing.

我希望能够单击表中的任何行并在面板上显示该信息.我不确定要完成这项工作需要利用什么.

I'm wanting to be able to click any row in a table and display that information on a panel. I'm not sure what I need to make use of to get the job done.

我想我需要使用:

I'm thinking I'll need to use:

• table.getSelectedRow()
• MouseListener()
• ListSelectionListener()

• table.getSelectedRow()
• MouseListener()
• ListSelectionListener()

我以前没有使用过Listeners，所以我只在阅读有关研究完成该工作所需的内容的文章或文档时才知道.

I haven't used Listeners before, so I only know of those from reading articles/documentation while researching what I need to do to complete the job.

关于如何在我的JPanel上显示信息，我也有些困惑.面板是在主类中创建的，而表是在其自己的类中创建的.

I'm also slightly confused as to how to display the info on my JPanel. The panel is created in the main class where as the table is created in its own class.

我非常感谢您的帮助和建议.

示例来源:

I appreciate any help and advice.

Example source :

import javax.swing.JFrame;
import javax.swing.JSplitPane;
import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;

public class SwingTesting {

    private final JFrame frame;
    private final TablePane tablePane;
    private final JSplitPane splitPane;
    private final JPanel infoPanel;

    public SwingTesting() {
        tablePane = new TablePane();
        infoPanel = new JPanel();
        frame = new JFrame();

        splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, tablePane, infoPanel);

        frame.add(splitPane);
        frame.pack();
        frame.setVisible(true);
    }


    class TablePane extends JPanel {

        private final JTable table;
        private final TableModel tableModel;
        private final ListSelectionModel listSelectionModel;

    public TablePane() {
        table = new JTable();
        tableModel = createTableModel();
        table.setModel(tableModel);
        table.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
        table.add(table.getTableHeader(), BorderLayout.PAGE_START);
        table.setFillsViewportHeight(true); 

        listSelectionModel = table.getSelectionModel();
        table.setSelectionModel(listSelectionModel);
        listSelectionModel.addListSelectionListener(new SharedListSelectionHandler());
        table.setSelectionModel(listSelectionModel);

        this.setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.anchor = GridBagConstraints.NORTHWEST;
    gbc.fill = GridBagConstraints.BOTH;
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbc.gridheight = 1;
    gbc.gridwidth = 3;
    gbc.insets = new Insets(5, 5, 5, 5);
    gbc.ipadx = 2;
    gbc.ipady = 2;
    gbc.weightx = 1;
    gbc.weighty = 1;
        this.add(new JScrollPane(table), gbc);
    }

    private TableModel createTableModel() {
        DefaultTableModel model = new DefaultTableModel(
            new Object[] {"Car", "Color", "Year"}, 0 
        ){
            @Override 
            public boolean isCellEditable(int row, int column) {
                return false;
            }
        };

        addTableData(model);
        return model;
    }

    private void addTableData(DefaultTableModel model) {
        model.addRow(new Object[] {"Nissan", "Black", "2007"});
        model.addRow(new Object[] {"Toyota", "Blue", "2012"});
        model.addRow(new Object[] {"Chevrolet", "Red", "2009"});
        model.addRow(new Object[] {"Scion", "Silver", "2005"});
        model.addRow(new Object[] {"Cadilac", "Grey", "2001"});
    }


    class SharedListSelectionHandler implements ListSelectionListener {

        @Override
        public void valueChanged(ListSelectionEvent e) {
            ListSelectionModel lsm = (ListSelectionModel) e.getSource();
            String contents = "";

            if(lsm.isSelectionEmpty()) {
                System.out.println("<none>");
            } else {
                int minIndex = lsm.getMinSelectionIndex();
                int maxIndex = lsm.getMaxSelectionIndex();
                for(int i = minIndex; i <= maxIndex; i++) {
                    if(lsm.isSelectedIndex(i)) {
                        for(int j = 0; j < table.getColumnCount(); j++) {
                            contents += table.getValueAt(i, j) + " ";
                        }
                    }
                }
                System.out.println(contents);
            }
        }

    }
}

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new SwingTesting();
            }
        });
    }
}

这并不像我想要的那样执行.它打印出两倍的信息.

This doesn't quite perform like I want it. It prints out double the information.

因此，它打印出Chevrolet Red 2009 Chevrolet Red 2009而不是Chevrolet Red 2009.最终，我想将文本放在JLabel中并将其放在面板上.请记住，包含JLabel的面板与表不在同一类中.

So instead of Chevrolet Red 2009 it prints out Chevrolet Red 2009 Chevrolet Red 2009. Ultimately I'm wanting to put the text in a JLabel and put it on the panel. Keeping in mind that the panel containing the JLabel is in a different class than the table.

推荐答案

table.getModel().addTableModelListener(tableModelListener);

请参见 TableModel.addTableModelListener(TableModelListener) 了解详情.

See TableModel.addTableModelListener(TableModelListener) for details.

基于SSCCE.

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

public class SwingTesting {

    private final JFrame frame;
    private final TablePane tablePane;
    private final JSplitPane splitPane;
    private final JPanel infoPanel;

    JTextField make = new JTextField(9);;
    JTextField color = new JTextField(7);;
    JTextField year = new JTextField(4);

    public SwingTesting() {
        tablePane = new TablePane();
        infoPanel = new JPanel(new FlowLayout(5));

        infoPanel.add(new JLabel("Make"));
        infoPanel.add(make);
        infoPanel.add(new JLabel("Color"));
        infoPanel.add(color);
        infoPanel.add(new JLabel("Year"));
        infoPanel.add(year);

        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, tablePane, infoPanel);

        frame.add(splitPane);
        frame.pack();
        frame.setVisible(true);
    }

    class TablePane extends JPanel {

        private final JTable table;
        private final TableModel tableModel;
        private final ListSelectionModel listSelectionModel;

    private void setFields(int index) {
        make.setText(table.getValueAt(index, 0).toString());
        color.setText(table.getValueAt(index, 1).toString());
        year.setText(table.getValueAt(index, 2).toString());
    }

    private void clearFields() {
        make.setText("");
        color.setText("");
        year.setText("");
    }

    public TablePane() {
        table = new JTable();
        tableModel = createTableModel();
        table.setModel(tableModel);
        table.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
        table.add(table.getTableHeader(), BorderLayout.PAGE_START);
        table.setFillsViewportHeight(true);

        listSelectionModel = table.getSelectionModel();
        table.setSelectionModel(listSelectionModel);
        listSelectionModel.addListSelectionListener(new SharedListSelectionHandler());
        table.setSelectionModel(listSelectionModel);

        this.setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.anchor = GridBagConstraints.NORTHWEST;
    gbc.fill = GridBagConstraints.BOTH;
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbc.gridheight = 1;
    gbc.gridwidth = 3;
    gbc.insets = new Insets(5, 5, 5, 5);
    gbc.ipadx = 2;
    gbc.ipady = 2;
    gbc.weightx = 1;
    gbc.weighty = 1;
        this.add(new JScrollPane(table), gbc);
    }

    private TableModel createTableModel() {
        DefaultTableModel model = new DefaultTableModel(
            new Object[] {"Car", "Color", "Year"}, 0
        ){
            @Override
            public boolean isCellEditable(int row, int column) {
                return false;
            }
        };

        addTableData(model);
        return model;
    }

    private void addTableData(DefaultTableModel model) {
        model.addRow(new Object[] {"Nissan", "Black", "2007"});
        model.addRow(new Object[] {"Toyota", "Blue", "2012"});
        model.addRow(new Object[] {"Chevrolet", "Red", "2009"});
        model.addRow(new Object[] {"Scion", "Silver", "2005"});
        model.addRow(new Object[] {"Cadilac", "Grey", "2001"});
    }


    class SharedListSelectionHandler implements ListSelectionListener {

        @Override
        public void valueChanged(ListSelectionEvent e) {
            ListSelectionModel lsm = (ListSelectionModel) e.getSource();
            String contents = "";

            if(lsm.isSelectionEmpty()) {
                System.out.println("<none>");
            } else {
                int minIndex = lsm.getMinSelectionIndex();
                int maxIndex = lsm.getMaxSelectionIndex();
                if (minIndex==maxIndex) {
                    setFields(minIndex);
                } else {
                    clearFields();
                    for(int i = minIndex; i <= maxIndex; i++) {
                        if(lsm.isSelectedIndex(i)) {
                            for(int j = 0; j < table.getColumnCount(); j++) {
                                contents += table.getValueAt(i, j) + " ";
                            }
                        }
                    }
                    System.out.println(contents);
                }
            }
        }

    }
}

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new SwingTesting();
            }
        });
    }
}

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