PNG图片透明背景变黑

packagecom.example.demo;
importjava.awt.Graphics2D;
importjava.awt.Image;
importjava.awt.Transparency;
importjava.awt.image.BufferedImage;
importjava.io.File;
importjavax.imageio.ImageIO;
publicclassDemo {
publicstaticvoidmain(String[] args) throwsException {
StringsrcImg="D:\\1.png";//输入图片文件StringdesImg2="D:\\2.png";//输出图片文件--背景由透明变成黑色StringdesImg3="D:\\3.png";//输出图片文件--背景透明不变transparent(srcImg, desImg2, false);
transparent(srcImg, desImg3, true);
    }
privatestaticvoidtransparent(StringsrcImg, StringdesImg, booleantransparent) throwsException {
Imageimg=ImageIO.read(newFile(srcImg));
BufferedImagebufImg=newBufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_RGB);
Graphics2Dg=bufImg.createGraphics();
//是否透明if(transparent) {  
bufImg=g.getDeviceConfiguration().createCompatibleImage(img.getWidth(null), img.getHeight(null), Transparency.TRANSLUCENT);
g=bufImg.createGraphics();
  }
g.drawImage(img, 0, 0, null);
ImageIO.write(bufImg, "png", newFile(desImg));
    }
}