Java实现移动的遮照效果，先实现椭圆形的遮罩，实例化媒体加载器，最后在创建缓冲区中的图像形成遮罩效果，而且它是会移动的。-Java implementation moving Zhezhao effects, oval mask first, instantiate the media loader Finally, create the image buffer to form a mask effect, and it will move.