Swing选项卡（JTabbedPane）自定义选项卡样式

Demo34_JTabbedPane.java:

package swing;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
/**
 * 选项卡面板  JTabbedPane
 */
public class Demo34_JTabbedPane extends JPanel{
	public static void main(String[] args) {
		JFrame frame=new JFrame("我的电脑 - 属性");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new Demo34_JTabbedPane(),BorderLayout.CENTER);
        SwingUtils.setCenter(frame);//设置窗体大小600*800并居中
        frame.setVisible(true);
	}
	public Demo34_JTabbedPane() {
		super(new GridLayout(1,1));
	    JTabbedPane tabbedPane=new JTabbedPane();
	    tabbedPane.setTabPlacement(JTabbedPane.TOP);
	    tabbedPane .setUI(new Demo34_JTabbedPane_01());
	    JComponent panel1=makeTextPanel("计算机名");
	    tabbedPane.addTab("计算机名",null, panel1,"Does nothing");
	    JComponent panel2=makeTextPanel("硬件");
	    tabbedPane.addTab("硬件",null,panel2,"Does twice as much nothing");
	    JComponent panel3=makeTextPanel("高级");
	    tabbedPane.addTab("高级",null,panel3,"Still does nothing");
	    JComponent panel4=makeTextPanel("系统保护");
	    panel4.setPreferredSize(new Dimension(410,50));
	    tabbedPane.addTab("系统保护",null,panel4,"Does nothing at all");
	    add(tabbedPane);
	}
	protected JComponent makeTextPanel(String text){
	    JPanel panel=new JPanel(false);
	    JLabel filler=new JLabel(text);
	    filler.setFont(new Font("宋体", 1, 50));
	    filler.setHorizontalAlignment(JLabel.CENTER);
	    panel.setLayout(new GridLayout(1,1));
	    panel.add(filler);
	    return panel;
	}
	protected static ImageIcon createImageIcon(String path){
	    java.net.URL imgURL=Demo34_JTabbedPane.class.getResource(path);
	    if(imgURL!=null){
	        return new ImageIcon(imgURL);
	    }
	    else{
	        System.err.println("Couldn't find file: "+path);
	        return null;
	    }
	}
}

Demo34_JTabbedPane_UI.java:

package swing;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.LayoutManager;
import javax.swing.JComponent;
import javax.swing.UIManager;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicTabbedPaneUI;

public class Demo34_JTabbedPane_UI extends BasicTabbedPaneUI
{
	private Color defaultColor = new Color(192, 192, 192);

	private Color selectedColor = new Color(155, 159, 232);

	public static ComponentUI createUI(JComponent c)
	{

		return new Demo34_JTabbedPane_UI();
	}

	protected void paintTabBackground(Graphics g, int tabPlacement,
			int tabIndex, int x, int y, int w, int h, boolean isSelected)
	{
		g.setColor(!isSelected || selectedColor == null ? defaultColor
				: selectedColor);

		switch (tabPlacement)
		{
		case LEFT:
			g.fillRect(x + 1, y + 1, w - 1, h - 3);
			break;
		case RIGHT:
			g.fillRect(x, y + 1, w - 2, h - 3);
			break;
		case BOTTOM:
			g.fillRect(x + 1, y, w - 3, h - 1);
			break;
		case TOP:

		default:
			g.fillRect(x + 1, y + 1, w - 3, h - 1);

		}

	}

	protected LayoutManager createLayoutManager()
	{


		return new TabbedPaneLayout();

	}// 设置Layout

	public class TabbedPaneLayout extends BasicTabbedPaneUI.TabbedPaneLayout
	{

		protected void calculateTabRects(int tabPlacement, int tabCount)
		{
			super.calculateTabRects(tabPlacement, tabCount);

			setRec(10);
			// 设置间距
			tabInsets.bottom = 10;//设置选项卡高度
		}

		public void setRec(int rec)
		{
			for (int i = 0; i < rects.length; i++)
			{
				rects[i].x = rects[i].x + rec * i;
			}
		}
	}

	public void setDefaultColor(Color defaultColor)
	{
		this.defaultColor = defaultColor;
	}

	public void setSelectedColor(Color selectedColor)
	{
		this.selectedColor = selectedColor;
	}

	protected void paintContentBorder(Graphics g, int tabPlacement,
			int selectedIndex)
	{
		int width = tabPane.getWidth();
		int height = tabPane.getHeight();
		Insets insets = tabPane.getInsets();
		Insets tabAreaInsets = getTabAreaInsets(tabPlacement);

		int x = insets.left;
		int y = insets.top;
		int w = width - insets.right - insets.left;
		int h = height - insets.top - insets.bottom;

		switch (tabPlacement)
		{
		case LEFT:
			x += calculateTabAreaWidth(tabPlacement, runCount, maxTabWidth);

			w -= (x - insets.left);
			break;
		case RIGHT:
			w -= calculateTabAreaWidth(tabPlacement, runCount, maxTabWidth);

			w += tabAreaInsets.left;

			break;
		case BOTTOM:
			h -= calculateTabAreaHeight(tabPlacement, runCount, maxTabHeight);

			h += tabAreaInsets.top;

			break;
		case TOP:



		default:
			y += calculateTabAreaHeight(tabPlacement, runCount, maxTabHeight);

			y -= tabAreaInsets.bottom;

			h -= (y - insets.top);
		}

		// Fill region behind content area
		Color color = UIManager.getColor("TabbedPane.contentAreaColor");
		if (color != null)
		{
			g.setColor(color);
		}
		else if (selectedColor == null)
		{
			g.setColor(tabPane.getBackground());
		}
		else
		{
			g.setColor(selectedColor);
		}
		g.fillRect(x, y, w, h);
		g.setColor(selectedColor);
		Graphics2D g2d = (Graphics2D) g;
		g2d.setStroke(new BasicStroke(10.0f));

		g.drawLine(x+6, y+5,w, y+5);
		g2d.setStroke(new BasicStroke(1.0f));

	}

}

效果如下：