Java 使用Graphics2D刻画雷达蛛网图并生成为图片，包含pom文件以及成功示例图

好的，以下是一个可以绘制雷达蛛网图并生成为图片的 Java 示例代码：

import java.awt.Graphics2D;
import java.awt.Color;
import java.awt.BasicStroke;
import java.awt.Font;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.File;

public class RadarChart {
    private int width;
    private int height;

    private double[] values;
    private String[] labels;
    private int sides;

    public RadarChart(int width, int height, double[] values, String[] labels, int sides) {
        this.width = width;
        this.height = height;
        this.values = values;
        this.labels = labels;
        this.sides = sides;
    }

    public void draw(String fileName) {
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = image.createGraphics();
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        g2d.setBackground(Color.WHITE);
        g2d.clearRect(0, 0, width, height);

        int cx = width / 2;
        int cy = height / 2;
        int r = Math.min(cx, cy) - 50;

        g2d.setStroke(new BasicStroke(2f));
        g2d.setColor(Color.BLACK);

        // 绘制雷达蛛网图
        for (int i = 1; i <= sides; i++) {
            int x = cx + (int) (r * Math.sin(i * 2 * Math.PI / sides));
            int y = cy + (int) (r * Math.cos(i * 2 * Math.PI / sides));
            g2d.drawLine(cx, cy, x, y);
        }

        g2d.setStroke(new BasicStroke(1f));

        // 绘制数据节点和连线
        g2d.setColor(Color.BLUE);
        for (int i = 0; i < sides; i++) {
            double value = values[i];
            int x1 = cx + (int) (r * Math.sin(i * 2 * Math.PI / sides));
            int y1 = cy + (int) (r * Math.cos(i * 2 * Math.PI / sides));
            int x2 = cx + (int) (r * value * Math.sin(i * 2 * Math.PI / sides));
            int y2 = cy + (int) (r * value * Math.cos(i * 2 * Math.PI / sides));
            g2d.drawLine(x1, y1, x2, y2);
            g2d.fillOval(x2 - 3, y2 - 3, 6, 6);
        }

        // 绘制标签
        g2d.setColor(Color.BLACK);
        Font font = new Font("Arial", Font.BOLD, 14);
        g2d.setFont(font);
        for (int i = 0; i < sides; i++) {
            String label = labels[i];
            int x = cx + (int) ((r + 20) * Math.sin(i * 2 * Math.PI / sides));
            int y = cy + (int) ((r + 20) * Math.cos(i * 2 * Math.PI / sides));
            int w = g2d.getFontMetrics().stringWidth(label);
            int h = g2d.getFontMetrics().getHeight();
            g2d.drawString(label, x - w / 2, y + h / 2);
        }

        try {
            // 将绘制的雷达蛛网图导出为图片
            ImageIO.write(image, "png", new File(fileName));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        double[] values = {0.6, 0.8, 0.7, 0.9, 0.5, 0.3};
        String[] labels = {"A", "B", "C", "D", "E", "F"};
        RadarChart chart = new RadarChart(500, 500, values, labels, 6);
        chart.draw("radar.png");
    }
}

在上面的示例代码中，我们使用 Graphics2D 类来绘制雷达蛛网图，然后使用 ImageIO 类将绘制的图形导出为 PNG 图片。还需要在项目的 pom.xml 文件中添加以下依赖项：

<dependencies>
    <dependency>
        <groupId>com.sun.media</groupId>
        <artifactId>jai-codec</artifactId>
        <version>1.1.3</version>
    </dependency>
    <dependency>
        <groupId>org.apache.xmlgraphics</groupId>
        <artifactId>batik-svggen</artifactId>
        <version>1.14</version>
    </dependency>
</dependencies>

希望这个示例可以帮助你！