这里通过前端传的 path 获取图片文件实际路径并予以显示，主要还是 setContentType 设置为图片格式，让浏览器感知这是一张图片。

    @RequestMapping(value = "/showImg")
    public void show(String path, HttpServletRequest request, HttpServletResponse response)  {response.setContentType("image/jpeg/jpg/png/gif/bmp/tiff/svg");
        try {path = request.getSession().getServletContext().getRealPath("/uploads/") + path;
            path = new String(path.getBytes(), "UTF-8");
            File file = new File(path);
            if (file.exists()) {InputStream in = new FileInputStream(path);
                ServletOutputStream os = response.getOutputStream();
                byte[] b = new byte[1024];
                while (in.read(b) != -1) {os.write(b);
                }
                in.close();
                os.flush();
                os.close();}
        } catch (IOException e) {e.printStackTrace();
        }
    }