方法代码：

        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        InputStream flagInputStream = loader.getResourceAsStream("static/imagesLogo/imageaaa.png");
        BufferedImage read;
        read = ImageIO.read(flagInputStream);
        System.out.println("测试读取图片" + read);


        InputStream resourceAsStream = LectureMessageServiceImpl.class.getClassLoader().getResourceAsStream("static/imagesLogo/imageaaa.png");
        BufferedImage read2;
        read2 = ImageIO.read(resourceAsStream);
        System.out.println("测试读取图片" + read2);