如何在Java中绘制点并保存输出图像？

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

public class DrawPoint {
    public static void main(String[] args) {
        int width = 500; // 图像宽度
        int height = 500; // 图像高度

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics graphics = image.getGraphics();

        // 设置背景颜色
        graphics.setColor(Color.WHITE);
        graphics.fillRect(0, 0, width, height);

        // 设置点的颜色
        graphics.setColor(Color.RED);

        // 绘制点
        int x = 250; // 点的横坐标
        int y = 250; // 点的纵坐标
        int pointSize = 5; // 点的大小
        graphics.fillOval(x - pointSize / 2, y - pointSize / 2, pointSize, pointSize);

        // 保存输出图像
        String outputImagePath = "output.png";
        try {
            ImageIO.write(image, "png", new File(outputImagePath));
            System.out.println("图像保存成功！");
        } catch (IOException e) {
            System.out.println("图像保存失败：" + e.getMessage());
        }

        // 释放资源
        graphics.dispose();
    }
}