https://blog.csdn.net/x324235r325/article/details/78518042
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver" p:defaultEncoding="UTF-8">
<property name="maxUploadSize"><value>524288000</value></property>
<property name="maxInMemorySize"><value>4096</value></property>
</bean>