104-Java代码png图片转ico

最新推荐文章于 2025-05-11 01:32:39 发布

菩提老师

最新推荐文章于 2025-05-11 01:32:39 发布

阅读量244

点赞数 1

分类专栏： Java从零到高薪就业文章标签： java python 开发语言

本文链接：https://blog.youkuaiyun.com/weixin_37326456/article/details/145821253

版权

Java从零到高薪就业专栏收录该内容

123 篇文章

订阅专栏

我们在做网页开发的时候，可能需要把png图片转换为网页的icon，那么Java代码是可以实现的：

package muniuzhe.util;


import net.ifok.image.image4j.codec.ico.ICOEncoder;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.Ellipse2D;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * @author：菩提老师
 * @学习地址：lzket.com PNG转ICON
 */
public class ImageUtil {

    public static void main(String[] args) throws IOException {
        BufferedImage bufferedImage = ImageIO.read(new File("C:\\Users\\Administrator\\Desktop\\applogo.png"));
        if (bufferedImage == null) {
            System.out.println("File not find");
        }
        List<BufferedImage> icons = new ArrayList<>();
//        icons.add(getScaledInstance(bufferedImage, 16, 16));
//        icons.add(getScaledInstance(bufferedImage, 32, 32));
        icons.add(getScaledInstance(bufferedImage, 64, 64));
//        icons.add(getScaledInstance(bufferedImage, 256, 256));
//        icons.add(getScaledInstance(bufferedImage, 64, 64));
//        icons.add(getScaledInstance(bufferedImage, 128, 128));
        ICOEncoder.write(icons, new File("C:\\Users\\Administrator\\Desktop\\favicon.ico"));
    }

    public static BufferedImage getScaledInstance(BufferedImage bufferedImage, int toWidth, int toHeight) {
        Image scaledInstance = bufferedImage.getScaledInstance(toWidth, toHeight, Image.SCALE_SMOOTH);
        BufferedImage newBufferedImage = new BufferedImage(toWidth,
                toHeight, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = newBufferedImage.createGraphics();
        g2d.setBackground(new Color(0,0,0,0));
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.fill(new RoundRectangle2D.Float(0, 0, 64, 64, 18,
                18));

        g2d.drawImage(scaledInstance, 0, 0,  null);
        g2d.dispose();
        return newBufferedImage;
    }
}