java如何从BufferImage生成图像

Question

我试图从BufferImage生成图像，但它不起作用。这是我的密码

这个代码不起作用，有人能帮我吗

try {

       BufferedImage bimage = (BufferedImage)(new ImageIcon("str")).getImage();

       BufferedImage image = new BufferedImage(500, 500, bimage.TYPE_BYTE_GRAY);
       File outputfile = new File("saved.png");
       ImageIO.write(image, "png", outputfile); 
       Image image_1  = ImageIO.read(new File("saved.png"));

       lp2_2.setIcon(new ImageIcon(image_1));

   } catch (IOException e) {}