java 生成透明背景图片

        //开始绘图         graphics2d.setBackground(Color.WHITE);         graphics2d.clearRect(0, 0, width, height);                         graphics2d.setPaint(new Color(backgroundcolorR, backgroundcolorG, backgroundcolorB,backgroundcolorA));      //设置背景颜色        graphics2d.fillRect(0, 0, width, height);  //填充颜色        //设置透明  start          bufferedImage = graphics2d.getDeviceConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT);          graphics2d=bufferedImage.createGraphics();          //设置透明  end