1.如果确定前后端代码都写的没问题,但是接口参数multipartFile仍然取不到为空,检查配置,是否已经注入了@Bean("multipartResolver")这个bean
代码如下(代码为kotlin的,需自己转换成Java):
@Bean("multipartResolver")
fun multipartResolver(): MultipartResolver {
val resolver = CommonsMultipartResolver()
resolver.setDefaultEncoding("UTF-8")
resolver.setResolveLazily(true)//resolveLazily属性启用是为了推迟文件解析,以在在UploadAction中捕获文件大小异常
resolver.setMaxInMemorySize(40960)
resolver.setMaxUploadSize((50 * 1024 * 1024).toLong())//上传文件大小 50M 50*1024*1024
return resolver
}
2.注入了这个bean之后,启动项目,报了classNotFoundError:DiskFileItemFactory,是因为缺了commons-io和commons-fileupload两个jar包,在pom.xml中加上即可
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>1.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>