Java程序Png图片保持透明度处理

核心代码

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

public class A {
    public static BufferedImage resize(int faceWidth, BufferedImage srcImg) throws IOException {
        int imgWidth = 0;
        if (faceWidth > 70 && faceWidth < 120) {
            imgWidth = faceWidth * 7 / 8;
        } else if (faceWidth > 60 && faceWidth < 70) {
            imgWidth = faceWidth * 11 / 10;
        } else if (faceWidth < 60) {
            imgWidth = faceWidth * 6 / 5;
        } else {
            imgWidth = faceWidth * 4 / 5;
        }
        int imgHeight = imgWidth * srcImg.getHeight() / srcImg.getWidth();
        BufferedImage resizedImg = new BufferedImage(imgWidth, imgHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D resizedG = resizedImg.createGraphics();
        resizedImg = resizedG.getDeviceConfiguration().createCompatibleImage(imgWidth, imgHeight, Transparency.TRANSLUCENT);
        resizedG.dispose();
        resizedG = resizedImg.createGraphics();
        Image from = srcImg.getScaledInstance(imgWidth, imgHeight, srcImg.SCALE_AREA_AVERAGING);
        resizedG.drawImage(from, 0, 0, null);
        resizedG.dispose();
        return resizedImg;
    }

    public static void main(String[] args) {
        try {
            //读入图片
            BufferedImage image = (BufferedImage) ImageIO.read(new File("C:\\Users\\Administrator\\Desktop\\zjb.png"));
            //处理图片
            BufferedImage resize = resize(1769, image);
            //输出图片
            File outputfile = new File("C:\\Users\\Administrator\\Desktop\\zjb_deal.png");
            ImageIO.write(resize, "png", outputfile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}