如果要创建CustomButtonUI，则必须查看
- 最深的BasicXxxUI。
从JButton覆盖颜色列表
请注意，没有paintComponent()。是错误的，只需使用paint()方法，
如果可能的话，下面仅是一个简单示例（对于metal JButton）。请注意，仅对于metal LaF，我是如此懒惰，并且没有关于覆盖paintText，paintIcon，paintFocus，paintBorder的东西（对于所有功能，您必须检查BasicButtonUI的可用方法），而我放到ButtonModel上的东西只是为了我的享受。
import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.AbstractBorder;import javax.swing.border.Border;import javax.swing.event.ChangeEvent;import javax.swing.event.ChangeListener;import javax.swing.plaf.ComponentUI;import javax.swing.plaf.metal.metalButtonUI;public class textareaInButton { private Jframe frame = new Jframe("sssssssss"); private JButton tip1Null = new JButton(" test button "); public textareaInButton() { Border line, raisedbevel, loweredbevel, title, empty; line = BorderFactory.createLineBorder(Color.black); raisedbevel = BorderFactory.createRaisedBevelBorder(); loweredbevel = BorderFactory.createLoweredBevelBorder(); title = BorderFactory.createTitledBorder(""); empty = BorderFactory.createEmptyBorder(1, 1, 1, 1); final Border compound; Color crl = (Color.blue); compound = BorderFactory.createCompoundBorder(empty, new OldRoundedBorderLine(crl)); Color crl1 = (Color.red); final Border compound1; compound1 = BorderFactory.createCompoundBorder(empty, new OldRoundedBorderLine(crl1)); Color crl2 = (Color.black); final Border compound2; compound2 = BorderFactory.createCompoundBorder(empty, new OldRoundedBorderLine(crl2)); tip1Null.setFont(new Font("Serif", Font.BOLD, 14)); tip1Null.setForeground(Color.darkGray); tip1Null.setPreferredSize(new Dimension(50, 30)); tip1Null.addActionListener(new java.awt.event.ActionListener() { @Override public void actionPerformed(ActionEvent e) { } }); tip1Null.setBorderPainted(true); tip1Null.setFocusPainted(false); tip1Null.setBorder(compound); tip1Null.setHorizontalTextPosition(SwingConstants.CENTER); tip1Null.setVerticalTextPosition(SwingConstants.BOTTOM); tip1Null.setUI(new ModifButtonUI()); tip1Null.getModel().addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) { ButtonModel model = (ButtonModel) e.getSource(); if (model.isRollover()) { tip1Null.setBorder(compound1); } else { tip1Null.setBorder(compound); } if (model.isPressed()) { tip1Null.setBorder(compound2); } } }); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); frame.add(tip1Null, BorderLayout.CENTER); frame.setLocation(150, 150); frame.setPreferredSize(new Dimension(310, 75)); frame.setLocationRelativeTo(null); frame.pack(); frame.setVisible(true); } public static void main(String args[]) { EventQueue.invokeLater(new Runnable() { @Override public void run() { textareaInButton taib = new textareaInButton(); } }); }}class OldRoundedBorderLine extends AbstractBorder { private final static int MARGIN = 5; private static final long serialVersionUID = 1L; private Color color; OldRoundedBorderLine(Color clr) { color = clr; } public void setColor(Color clr) { color = clr; } @Override public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) { ((Graphics2D) g).setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g.setColor(color); g.drawRoundRect(x, y, width, height, MARGIN, MARGIN); } @Override public Insets getBorderInsets(Component c) { return new Insets(MARGIN, MARGIN, MARGIN, MARGIN); } @Override public Insets getBorderInsets(Component c, Insets insets) { insets.left = MARGIN; insets.top = MARGIN; insets.right = MARGIN; insets.bottom = MARGIN; return insets; }}class ModifButtonUI extends metalButtonUI { private static final ModifButtonUI buttonUI = new ModifButtonUI(); ModifButtonUI() { } public static ComponentUI createUI(JComponent c) { return new ModifButtonUI(); } @Override public void paint(Graphics g, JComponent c) { final Color color1 = new Color(230, 255, 255, 0); final Color color2 = new Color(255, 230, 255, 64); final Color alphaColor = new Color(200, 200, 230, 64); final Color color3 = new Color( alphaColor.getRed(), alphaColor.getGreen(), alphaColor.getBlue(), 0); final Color color4 = new Color( alphaColor.getRed(), alphaColor.getGreen(), alphaColor.getBlue(), 64); super.paint(g, c); Graphics2D g2D = (Graphics2D) g; GradientPaint gradient1 = new GradientPaint( 0.0F, (float) c.getHeight() / (float) 2, color1, 0.0F, 0.0F, color2); Rectangle rec1 = new Rectangle(0, 0, c.getWidth(), c.getHeight() / 2); g2D.setPaint(gradient1); g2D.fill(rec1); GradientPaint gradient2 = new GradientPaint( 0.0F, (float) c.getHeight() / (float) 2, color3, 0.0F, c.getHeight(), color4); Rectangle rec2 = new Rectangle(0, c.getHeight() / 2, c.getWidth(), c.getHeight()); g2D.setPaint(gradient2); g2D.fill(rec2); } @Override public void paintButtonPressed(Graphics g, AbstractButton b) { paintText(g, b, b.getBounds(), b.getText()); g.setColor(Color.red.brighter()); g.fillRect(0, 0, b.getSize().width, b.getSize().height); } public void paintBorder(Graphics g) { } @Override protected void paintFocus(Graphics g, AbstractButton b, Rectangle viewRect, Rectangle textRect, Rectangle iconRect) { }}
