SSM上传文件空指针问题

报错信息如下

java.lang.NullPointerException: Cannot invoke "org.springframework.web.multipart.MultipartFile.isEmpty()" because "file" is null 

请问一下为什么我的显示是file is null 应该怎么修改呀？

在controller中的文件参数的变量名改成filename试一下，你的页面传过来的变量名和controller接口的变量名不一致

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