spring 上传图片

 @RequestMapping(value = "/upload",method = RequestMethod.POST)
     public String upload(@RequestParam(value = "file", required = false) MultipartFile file){
         // 判断文件是否为空
         if (!file.isEmpty()) {
             // 文件保存路径
             String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/"+ file.getOriginalFilename();

             UUID uuid = UUID.randomUUID();

             String filename = uuid + file.getOriginalFilename();
             File targetFile = new File(filePath,filename);
             if (!targetFile.exists()) {

                 try {
                     targetFile.createNewFile();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
             // 转存文件
             try {
                 file.transferTo(targetFile);
             } catch (IOException e) {
                 e.printStackTrace();
             }

         }
         return "upload";
     }