JTable 中的 JComboBox 中的图像在选择后仅显示路径名

Question

我想在 jTable 中有一个带有图像的 ComboBox。但是，虽然我可以在下拉菜单中看到图像，但一旦选择，我只会在表格中看到它们的路径名称作为字符串。谁能指出我正确的方向？

/* Modified from http://docs.oracle.com/javase/tutorial/uiswing/examples/components/index.html#TableRenderDemo */

/*
 * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
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package tablerenderdemo;

import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.ImageIcon;

public class TableRenderDemo extends JPanel {
    public TableRenderDemo() {
        super(new GridLayout(1,0));

        JTable table = new JTable(new MyTableModel());
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        table.setFillsViewportHeight(true);
        JScrollPane scrollPane = new JScrollPane(table);
        setUpSportColumn(table, table.getColumnModel().getColumn(1));
        add(scrollPane);
    }

    public void setUpSportColumn(JTable table, TableColumn symbolColumn) {
        JComboBox comboBox = new JComboBox();
        comboBox.addItem( new ImageIcon("symbols/circle.png") );
        comboBox.addItem( new ImageIcon("symbols/diamond.png") );
        symbolColumn.setCellEditor(new DefaultCellEditor(comboBox));

        DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
        renderer.setToolTipText("Click for combo box");
        symbolColumn.setCellRenderer(renderer);
    }

    class MyTableModel extends AbstractTableModel {
        private String[] columnNames = {"Last Name","Symbol","# of Years","Vegetarian"};
        private Object[][] data = {
        {"Smith",
         new ImageIcon("symbols/circle.png"), new Integer(5), new     Boolean(false)},
        {"Doe",
         new ImageIcon("symbols/circle.png"), new Integer(3), new Boolean(true)}
        };

        public int getColumnCount() {
            return columnNames.length;
        }
        public int getRowCount() {
            return data.length;
        }
        public String getColumnName(int col) {
            return columnNames[col];
        }
        public Object getValueAt(int row, int col) {
            return data[row][col];
        }
        public Class getColumnClass(int c) {
            return getValueAt(0, c).getClass();
        }
        public boolean isCellEditable(int row, int col) {
            if (col < 1) {
                return false;
            } else {
                return true;
            }
        }
        public void setValueAt(Object value, int row, int col) {
            data[row][col] = value;
            fireTableCellUpdated(row, col);
        }
    }

    private static void createAndShowGUI() {
        JFrame frame = new JFrame("TableRenderDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        TableRenderDemo newContentPane = new TableRenderDemo();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);

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

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

Answer 1

您已将表格的default renderer（知道如何呈现Icon）替换为DefaultTableCellRenderer 的实例，而DefaultTableCellRenderer 不知道。后者是一个JLabel，它使用图标的toString() 方法简单地调用setText()。去掉这几行看看效果。

DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setToolTipText("Click for combo box");
symbolColumn.setCellRenderer(renderer);