项目是springboot+shiro，前期做过上传功能，直接用发现报错：

MultipartHttpServletRequest params = (MultipartHttpServletRequest) request;

控制台报错信息：

java.lang.ClassCastException: org.apache.shiro.web.servlet.ShiroHttpServletRequest cannot be cast to org.springframework.web.multipart.MultipartHttpServletRequest

断点调试发现问题：

解决办法：

ShiroHttpServletRequest shiroRequest = (ShiroHttpServletRequest) request;
CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver();
MultipartHttpServletRequest multipartRequest = commonsMultipartResolver.resolveMultipart((HttpServletRequest) shiroRequest.getRequest());

可以正常获取参数：

String pageParam = multipartRequest.getParameter("pageParam");  // 页面的参数..
MultipartFile file = multipartRequest.getFile("filePath"); // 上传的文件id..

写到最后，新增按照原来的写法没问题，编辑保存却需要使用ShiroHttpServletRequest转换一次，前台人员说请求的写法都是一样的很是奇怪。