1、 MultipartFile转BufferedImage

public static BufferedImage getBufferedImage(MultipartFile file){BufferedImage image= ImageIO.read(file.getInputStream());
}

2、 BufferedImage转MultipartFile

public static MultipartFile fileCase(BufferedImage image) {//得到BufferedImage对象MultipartFile multipartFile = null;try {//创建一个ByteArrayOutputStreamByteArrayOutputStream os = new ByteArrayOutputStream();//把BufferedImage写入ByteArrayOutputStreamImageIO.write(image, "png", os);//ByteArrayOutputStream转成InputStreamInputStream input = new ByteArrayInputStream(os.toByteArray());//InputStream转成MultipartFilemultipartFile = new MockMultipartFile("file", "file.png", "text/plain", input);} catch (IOException e) {e.printStackTrace();}return multipartFile;}