spirng后台接受前端传入的图片

记忆力不好了，老容易忘记，笔记note一下

    @RequestMapping(value = "/upload", method = RequestMethod.POST)
    @ResponseBody
    public String upLoadImg(MultipartFile file, HttpServletRequest request) throws IOException {
        String path = request.getSession().getServletContext().getRealPath("upload");
        String fileName = file.getOriginalFilename();// 获取到上传文件的名字
        // file.getSize();获取到上传文件的大小
        File dir = new File(path, fileName);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        // MultipartFile自带的解析方法
        file.transferTo(dir);
        String directory = dir.getCanonicalPath();
        System.out.println("directory:" + directory);
        return "/upload" + "/" + fileName;
    }