如何将图像放在选项卡中，使其看起来像一个图标

Question

我正在尝试将图像添加到选项卡，使其看起来像一个图标。我想在选项卡上放置一个png图像（检查图像）
是否可以在java中执行此操作？

Answer 1

JTabbedPane允许您提供一个组件作为选项卡“渲染器”（各种）。

请查看JTabbedPane#setTabComponentAt了解更多详情，并查看this example了解详情。

更新了示例

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestTabbedPaneIcon {

    public static void main(String[] args) {
        new TestTabbedPaneIcon();
    }

    public TestTabbedPaneIcon() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JTabbedPane tp = new JTabbedPane();
                tp.addTab("Dates", new JPanel());
                tp.addTab("Deliveries", new JPanel());
                tp.addTab("Exports", new JPanel());

                tp.setTabComponentAt(0, getLabel("Dates", "/Icon03.png"));
                tp.setTabComponentAt(1, getLabel("Deliveries", "/Icon01.png"));
                tp.setTabComponentAt(2, getLabel("Exports", "/Icon02.png"));

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(tp);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    protected JLabel getLabel(String title, String icon) {
        JLabel label = new JLabel(title);
        try {
            label.setIcon(new ImageIcon(ImageIO.read(getClass().getResource(icon))));
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        return label;
    }
}

Answer 2

JTabbedPane有api为标签设置图标，无论是在添加标签内容时还是稍后：

// when adding
tabbedPane.addTab(String, Icon, Component);
// after having added
tabbedPane.setIconAt(int, Icon);