一.使用javax.imageio包下ImageIO类的read()方法
1.Image image = ImageIO.read(new FileInputStream(“文件路径”));
2.Image image = ImageIO.read(new File());
3.Image image = ImageIO.read(new URL()));
File file = new File("images\back2.png");
Image image = ImageIO.read(new FileInputStream("images\back2.png"));
image = ImageIO.read(file);
URL url = new URL("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1560583876537&di=58273c7d7c5698e55c1e3f81a5583365&imgtype=0&src=http%3A%2F%2Fimage20.it168.com%2Fpicshow%2F900x675%2F20111124%2F2011112416144308103.jpg");
image = ImageIO.read(url);
二.使用Toolkit类下的getImage()方法
1.Toolkit.getDefaultToolkit().getImage(“图片路径”);
Image image = Toolkit.getDefaultToolkit().getImage("images/a.jpg");
三.使用ImageIcon类的getImage()
1.new ImageIcon("图片路径).getImage();
Image image = new ImageIcon("images\a.png")).getImage()