如何在JTable列中设置图标？

Question

我能够设置列的标题,但无法在JTable的第一列的所有行中设置图标.

public class iconRenderer extends DefaultTableCellRenderer{
    public Component getTableCellRendererComponent(JTable table,Object obj,boolean isSelected,boolean hasFocus,int row,int column){
        imageicon i=(imageicon)obj;
        if(obj==i)
            setIcon(i.imageIcon);
        setBorder(UIManager.getBorder("TableHeader.cellBorder"));
        setHorizontalAlignment(JLabel.CENTER);
        return this;
    }
}

public class imageicon{
    ImageIcon imageIcon;
    imageicon(ImageIcon icon){
        imageIcon=icon;
    }
}  

---

我的BuildTable()方法中的行和下面的行.

    public void SetIcon(JTable table, int col_index, ImageIcon icon){
      table.getTableHeader().getColumnModel().getColumn(col_index).setHeaderRenderer(new iconRenderer());
      table.getColumnModel().getColumn(col_index).setHeaderValue(new imageicon(icon));
}

---

我们如何为第一列的所有行设置它？我已尝试使用for循环,但还没有得到行迭代来设置图标.或者还有其他方法吗？

Answer 1

无需创建自定义渲染.JTable已经支持Icon渲染器.你只需告诉表使用这个渲染器.这是通过覆盖表模型的getColumnClass(...)方法完成的:

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

public class TableIcon extends JPanel
{
    public TableIcon()
    {
        Icon aboutIcon = new ImageIcon("about16.gif");
        Icon addIcon = new ImageIcon("add16.gif");
        Icon copyIcon = new ImageIcon("copy16.gif");

        String[] columnNames = {"Picture", "Description"};
        Object[][] data =
        {
            {aboutIcon, "About"},
            {addIcon, "Add"},
            {copyIcon, "Copy"},
        };

        DefaultTableModel model = new DefaultTableModel(data, columnNames)
        {
            //  Returning the Class of each column will allow different
            //  renderers to be used based on Class
            public Class getColumnClass(int column)
            {
                return getValueAt(0, column).getClass();
            }
        };
        JTable table = new JTable( model );
        table.setPreferredScrollableViewportSize(table.getPreferredSize());

        JScrollPane scrollPane = new JScrollPane( table );
        add( scrollPane );
    }

    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("Table Icon");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new TableIcon());
        frame.setLocationByPlatform( true );
        frame.pack();
        frame.setVisible( true );
    }

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

}