9、文件上传

需要再看： https://www.bilibili.com/video/BV1aE41167Tu?p=29&spm_id_from=pageDriver&vd_source=5898104e0f6f9e5d5c0a3b934a97507d
Java Web 文件上传：https://www.bilibili.com/video/BV12J411M7Sj?p=38&vd_source=5898104e0f6f9e5d5c0a3b934a97507d

1.文件上传配置

<!--文件上传配置-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!--        请求的编码格式必须和jsp中的pageEncoding属性一致，以便正确读取表单内容-->
        <property name="defaultEncoding" value="utf-8"/>
        <property name="maxUploadSize" value="10485760"/>
        <property name="maxInMemorySize" value="40960"/>

• 文件依赖

<!--        文件上传-->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
        </dependency>
    </dependencies>