java做的圆角矩形按钮

                                     

 

 

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Shape;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.geom.RoundRectangle2D;

import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JFrame;

public class MyButton extends JButton implements MouseListener {
 private Shape shape = null;

 private Color click = new Color(0, 0, 113);// 按下时的颜色

 private Color quit = new Color(237, 234, 228);// 离开时颜色

 public MyButton(String s) {
  super(s);
  addMouseListener(this);
  setContentAreaFilled(false);// 是否显示外围矩形区域 选否
 }

 public MyButton() {
  super();
  addMouseListener(this);
 }

 public MyButton(String text, Icon icon) {
  super(text, icon);
  addMouseListener(this);
 }

 public MyButton(Icon icon) {
  super(icon);
  addMouseListener(this);
 }

 public void setColor(Color c, Color q) {
  click = c;
  quit = q;
 }

 public void mouseClicked(MouseEvent e) {
  System.out.println("mouseClicked");
 }

 public void mousePressed(MouseEvent e) {
  System.out.println("mousePressed");
 }

 public void mouseReleased(MouseEvent e) {
  System.out.println("mouseReleased");
 }

 public void mouseExited(MouseEvent e) {
  System.out.println("mouseExited");
 }

 public void mouseEntered(MouseEvent e) {
  System.out.println("mouseEntered");
 }

 public void paintComponent(Graphics g) {
  //如果按下则为ＣＬＩＣＫ色 否则为 ＱＵＩＴ色
  if (getModel().isArmed()) {
   g.setColor(click);
  } else {
   g.setColor(quit);
  }
  //填充圆角矩形区域 也可以为其它的图形
  g
    .fillRoundRect(0, 0, getSize().width - 1, getSize().height - 1,
      20, 20);
  //必须放在最后 否则画不出来
  super.paintComponent(g);
 }

 public void paintBorder(Graphics g) {
  //画边界区域
  g.setColor(click);
  g
    .drawRoundRect(0, 0, getSize().width - 1, getSize().height - 1,
      20, 20);
 }

 public boolean contains(int x, int y) {
  //判断点（x,y）是否在按钮内
  if (shape == null || !(shape.getBounds().equals(getBounds()))) {
   shape = new RoundRectangle2D.Float(0, 0, getWidth(), getHeight(),
     20, 20);
  }
  return shape.contains(x, y);
 }

 public static void main(String[] argv) {
  JFrame f = new JFrame();
  f.setSize(400, 300);

  MyButton btn = new MyButton("button");

  f.getContentPane().add(btn, BorderLayout.NORTH);
  f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  f.setVisible(true);
 }
}