MultipartFile 动态决定是否上传文件,解决不上传文件报错

controller

接收参数   用 HttpServletRequest 代替 @RequestParam()  接收参数

picFile 前台 传文件的参数名字  ,   这样 前段 传 null  就可以  不必须 存文件了

 MultipartFile picFile = null; ???????????boolean isMultipart = ServletFileUpload.isMultipartContent(request); ???????????if (isMultipart){ ???????????????MultipartHttpServletRequest multipartRequest = WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class); ???????????????picFile = multipartRequest.getFile("picFile"); ???????????}

https://blog.csdn.net/zhaofuwu/article/details/52694487

https://blog.csdn.net/m0_38004838/article/details/78286067

 springMVC的   https://blog.csdn.net/chenchunlin526/article/details/70945877

MultipartFile 动态决定是否上传文件,解决不上传文件报错

原文地址：https://www.cnblogs.com/angdh/p/10010147.html