如何在Swing中创建带边框阴影的JButton

Question

如何在Swing中使用内部阴影创建一个像这样的JButton？

我想新建JButton边境的不同Color，像顶部和左边框的颜色应该是黑色，右边和底部边框的颜色应该是白色。

但是，所有在一起，我想要像上面的图像的顶部和左侧的深灰色的内部阴影。

Answer 1

首先，我认为你可以用一个简单的BevelBorder来实现这一点，但不幸的是你不能设置边界的厚度舒适...所以我不得不基本上做一个定制的Border。如果您不喜欢paintBorder方法中按钮的样式，但您必须知道如何使用Graphics，则可以对其进行更多定制。这是我得到的：

import java.awt.Color; 
import java.awt.Component; 
import java.awt.Dimension; 
import java.awt.FlowLayout; 
import java.awt.Graphics; 
import java.awt.Insets; 

import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.border.Border; 

/** 
* 
*/ 
public class MyBorder implements Border { 

    private int thickness_ = 4; 
    private Color white = Color.WHITE; 
    private Color gray = Color.GRAY; 
    private Color black = Color.BLACK; 

    public static void main(String[] args) { 

     JFrame frm = new JFrame("Border Test"); 
     frm.setLayout(new FlowLayout()); 
     JButton btn = new JButton("Button"); 

     MyBorder border = new MyBorder(); 

     btn.setBorder(border); 
     btn.setFocusPainted(false); 
     btn.setPreferredSize(new Dimension(60,30)); 
     btn.setBackground(Color.LIGHT_GRAY); 

     frm.add(btn); 
     frm.setSize(200,200); 
     frm.setVisible(true); 

    } 

    public void paintBorder(Component c, Graphics g, int x, int y, int width, 
      int height) { 
     Color oldColor = g.getColor(); 
     int i; 

     for (i = 0; i < thickness_; i++) { 
      g.setColor(white); 
      g.drawRect(x + i, y + i, width - i - i - 1, height - i - i - 1); //White Rectangle 
     } 
     for (i = 0; i < thickness_/2; i++) { 
      g.setColor(black); 
      g.drawLine(x + i, y + i, (width - x) - (i * 2), y + i); //Top Outer Edge 
      g.drawLine(x + i, y + i, x + i, (height - y) - (i * 2)); //Left Outer Edge 
     } 
     for (i = thickness_/2; i < thickness_; i++) { 
      g.setColor(gray); 
      g.drawLine(x + i, y + i, (width - x) - (i * 2), y + i); //Top Inner Edge 
      g.drawLine(x + i, y + i, x + i, (height - y) - (i * 2)); //Left Inner Edge 

     } 
     g.setColor(oldColor); 
    } 

    public int getThickness() { 
     return thickness_; 
    } 

    public void setThickness(int i) { 
     thickness_ = i; 
    } 

    public boolean isBorderOpaque() { 
     return true; 
    } 

    public Insets getBorderInsets(Component c) { 
     return new Insets(thickness_, thickness_, thickness_, thickness_); 
    } 

}