org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size exceeded; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.impl.FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 1048576 bytes
翻译过来的大致意思就是文件大小超了
解决办法：
在application.properties中添加如下：
_#单个文件最大大小_ **spring.http.multipart.maxFileSize**=**20Mb** _#所有上传文件最大大小_ **spring.http.multipart.maxRequestSize**=**1000Mb**