Swing中Laber添加下划线
下划线的颜色可以单独定义
import java.awt.*;import javax.swing.*;import javax.swing.border.LineBorder;public class JLabelUnderLinePerfect extends JLabel {private Color underLineColor;public JLabelUnderLinePerfect() {this("");}public JLabelUnderLinePerfect(String text) {super(text);}public Color getUnderLineColor() {return underLineColor;}public void setUnderLineColor(Color pUnderLineColor) {underLineColor = pUnderLineColor;}public void paint(Graphics g) {super.paint(g);Rectangle r = g.getClipBounds();int xoffset = 0, yoffset = 0, pointX = 0, pointY = 0, point2X = 0, point2Y = 0;// 根据border的设置 计算出下划线的起止Pointif (null != this.getBorder()&& null != this.getBorder().getBorderInsets(this)) {Insets inserts = this.getBorder().getBorderInsets(this);xoffset = inserts.left;yoffset = inserts.bottom;}pointX = xoffset;pointY = point2Y = r.height - yoffset- getFontMetrics(getFont()).getDescent();point2X = pointX + getFontMetrics(getFont()).stringWidth(getText());if (null != underLineColor) {g.setColor(underLineColor);}g.drawLine(pointX, pointY, point2X, point2Y);}public static void main(String[] args) {JFrame f = new JFrame("JLabe with Under Line");f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);f.setSize(new Dimension(300, 200));f.setLayout(new FlowLayout());JLabelUnderLinePerfect label1 = new JLabelUnderLinePerfect("Label下划线");f.add(label1);JLabelUnderLinePerfect label2 = new JLabelUnderLinePerfect("Label下划线");label2.setUnderLineColor(Color.BLUE);f.add(label2);JLabelUnderLinePerfect label3 = new JLabelUnderLinePerfect("Label(Border)下划线");label3.setBorder(BorderFactory.createCompoundBorder(new LineBorder(Color.RED), BorderFactory.createEmptyBorder(8, 18, 28, 38)));label3.setUnderLineColor(Color.BLUE);f.add(label3);// f.pack();f.setVisible(true);}}?