SSH使用Spring中MultipartHttpServletRequest实现文件上传

HttpServletRequest request = ServletActionContext.getRequest();
String UserStr = HttpServletRequestUtil.getString(request,"Userstr");
System.out.println("UserStr:"+UserStr);
MultipartHttpServletRequest multipartRequest = null;
MultipartFile profileImg = null;
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
System.out.println("multipartResolver.isMultipart(request):"+multipartResolver.isMultipart(request));
if (multipartResolver.isMultipart(request)) {
multipartRequest = multipartResolver.resolveMultipart(request);
profileImg = (MultipartFile) multipartRequest.getFile("fileupload");
}

HttpServletRequest request = ServletActionContext.getRequest();
String UserStr = HttpServletRequestUtil.getString(request,"Userstr");
System.out.println("UserStr:"+UserStr);
MultipartHttpServletRequest multipartRequest = null;
MultipartFile profileImg = null;
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
System.out.println("multipartResolver.isMultipart(request):"+multipartResolver.
问题：
multipartRequest.getFile("fileupload")为null
有时form表单中的Userstr也为null

实现文件上传，需要3个条件，form表单中要post请求， enctype="multipart/form-data"，input中type="file"

你的可以上传1M以下的，这个应该不对吧 默认是能上传2M以下的，而且你也可以修改这个默认文件的大小

捏可以加上自己的对空处理的逻辑，代码并不存在绝对安全性，

文件上传from表单必须在from里面设置enctype="multipart/form-data“，楼主看下你是不是少写了

以前做过这个，可以参考我记录的：https://www.suancaiyu.xyz/read/2463.html

如果验证过楼上几位的情况还存在问题，楼主检查前端input标签name属性值与后端取文件的参数名是否一致