Java swing 一些控件样式的美化

1 按钮

JButton btn= new JButton();
//设置按钮默认图标
btn.setIcon();
// 设置按钮按下图标
btn.setPressedIcon();	
//设置按钮点击图标	
btn.setRolloverIcon();	
// 设置按钮无边框	
btn.setBorderPainted(false);
//设置按钮背景透明
startbtn.setContentAreaFilled(false);

2 输入框

//设置输入框透明 
		textfield.setOpaque(false);
// 设置输入框边框无
		textfield.setBorder(new EmptyBorder(0,0,0,0));

3 修改滚动条样式
重写BasicScrollBarUI

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JScrollBar;
import javax.swing.plaf.basic.BasicScrollBarUI;

/**
 * 自定义滚动条UI
 * 
 * @author zsg
 */
public class DemoScrollBarUI extends BasicScrollBarUI {

	@Override
	protected void configureScrollBarColors() {
		// 把手
		// thumbColor = Color.GRAY;
		// thumbHighlightColor = Color.BLUE;
		// thumbDarkShadowColor = Color.BLACK;
		// thumbLightShadowColor = Color.YELLOW;

		// 滑道
		trackColor = Color.black;
		setThumbBounds(0, 0, 3, 10);
		// trackHighlightColor = Color.GREEN;
	}

	/**
	 * 设置滚动条的宽度
	 */
	@Override
	public Dimension getPreferredSize(JComponent c) {
		// TODO Auto-generated method stub
		c.setPreferredSize(new Dimension(5, 0));
		return super.getPreferredSize(c);
	}

	// 重绘滑块的滑动区域背景
	public void paintTrack(Graphics g, JComponent c, Rectangle trackBounds) {
		Graphics2D g2 = (Graphics2D) g;
		GradientPaint gp = null;
		//判断滚动条是垂直的 还是水平的
		if (this.scrollbar.getOrientation() == JScrollBar.VERTICAL) {
			//设置画笔
			gp = new GradientPaint(0, 0, new Color(80, 80, 80),
					trackBounds.width, 0, new Color(80, 80, 80));
		}
		if (this.scrollbar.getOrientation() == JScrollBar.HORIZONTAL) {
			gp = new GradientPaint(0, 0, new Color(80, 80, 80),
					trackBounds.height, 0, new Color(80, 80, 80));
		}

		g2.setPaint(gp);
		//填充Track
		g2.fillRect(trackBounds.x, trackBounds.y, trackBounds.width,
				trackBounds.height);
		//绘制Track的边框
/*		 g2.setColor(new Color(175, 155, 95));
		 g2.drawRect(trackBounds.x, trackBounds.y, trackBounds.width - 1,
				trackBounds.height - 1);
				*/
		if (trackHighlight == BasicScrollBarUI.DECREASE_HIGHLIGHT)
			this.paintDecreaseHighlight(g);
		if (trackHighlight == BasicScrollBarUI.INCREASE_HIGHLIGHT)
			this.paintIncreaseHighlight(g);
	}

	@Override
	protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) {
		// 把绘制区的x，y点坐标定义为坐标系的原点
		// 这句一定一定要加上啊，不然拖动就失效了
		g.translate(thumbBounds.x, thumbBounds.y);
		// 设置把手颜色
		g.setColor(new Color(46, 46, 46));
		// 画一个圆角矩形
		// 这里面前四个参数就不多讲了，坐标和宽高
		// 后两个参数需要注意一下，是用来控制角落的圆角弧度
		// g.drawRoundRect(0, 0, 5, thumbBounds.height - 1, 5, 5);
		// 消除锯齿
		Graphics2D g2 = (Graphics2D) g;
		RenderingHints rh = new RenderingHints(RenderingHints.KEY_ANTIALIASING,
				RenderingHints.VALUE_ANTIALIAS_ON);
		g2.addRenderingHints(rh);
		// 半透明
		g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,
				0.5f));
		// 设置填充颜色，这里设置了渐变，由下往上
		// g2.setPaint(new GradientPaint(c.getWidth() / 2, 1, Color.GRAY,
		// c.getWidth() / 2, c.getHeight(), Color.GRAY));
		// 填充圆角矩形
		g2.fillRoundRect(0, 0, 5, thumbBounds.height - 1, 5, 5);
	}

	/**
	 * 创建滚动条上方的按钮
	 */
	@Override
	protected JButton createIncreaseButton(int orientation) {
		JButton button = new JButton();
		button.setBorderPainted(false);
		button.setContentAreaFilled(false);
		button.setBorder(null);
		return button;
	}

	/**
	 * 创建滚动条下方的按钮
	 */
	@Override
	protected JButton createDecreaseButton(int orientation) {
		JButton button = new JButton();
		button.setBorderPainted(false);
		button.setContentAreaFilled(false);
		button.setFocusable(false);
		button.setBorder(null);
		return button;
	}

	

}

JScrollPane scrollPane = new JScrollPane(chatText);
		//设置滚动条样式
		scrollPane .getVerticalScrollBar().setUI(new DemoScrollBarUI());
		scrollPane .setBounds(40, 330, 475, 110);
		// 将 JScrollPane背景设置透明
		scrollPane .setOpaque(false);
		scrollPane .getViewport().setOpaque(false);
                  //设置无边框
		scrollPane .setBorder(new EmptyBorder(0, 0, 0, 0));