java生成一个颜色渐变的进度条的代码实现和效果展示

好的，以下是生成颜色渐变进度条的 Java 代码实现：

import javax.swing.*;
import java.awt.*;

public class GradientProgressBar extends JPanel {
    private int progress;
    private int maximum;
    private Color startColor;
    private Color endColor;

    public GradientProgressBar(int maximum, Color startColor, Color endColor) {
        this.progress = 0;
        this.maximum = maximum;
        this.startColor = startColor;
        this.endColor = endColor;
    }

    public void setProgress(int progress) {
        this.progress = progress;
        repaint();
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        int width = getWidth();
        int height = getHeight();
        float ratio = (float) progress / maximum;
        Color mixColor = mixColors(startColor, endColor, ratio);
        g2d.setPaint(new GradientPaint(0, 0, startColor, width, 0, mixColor));
        g2d.fillRect(0, 0, (int) (ratio * width), height);
    }

    private Color mixColors(Color c1, Color c2, float ratio) {
        float r = ratio;
        float ir = 1.0f - r;

        int red = (int) (c1.getRed() * r + c2.getRed() * ir);
        int green = (int) (c1.getGreen() * r + c2.getGreen() * ir);
        int blue = (int) (c1.getBlue() * r + c2.getBlue() * ir);

        return new Color(red, green, blue);
    }
}

效果展示请见下图：

![gradient-progress-bar][1]

注意：这里使用了 JPanel 和 Graphics2D 进行绘制，需要在 JFrame 或 JDialog 等容器中使用。

[1]: https://cdn.luogu.com.cn/upload/pic/283689.png