SpringMVC + servlet3.0 文件上传的配置和实现代码

<!-- SpringMVC --> <servlet>  <servlet-name>myWeb</servlet-name>  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  <init-param>   <param-name>contextConfigLocation</param-name>   <param-value>classpath:springmvc/servlet.xml</param-value>  </init-param>  <load-on-startup>1</load-on-startup>  <multipart-config>   <!-- <location>/</location> -->   <max-file-size>5242880</max-file-size> <!--单个文件最大大小：5MB-->   <max-request-size>20971520</max-request-size> <!--所有文件最大大小：20MB-->   <file-size-threshold>0</file-size-threshold> <!-- 超过这个大小直接存硬盘，而不是内存 -->  </multipart-config> </servlet>  <servlet-mapping>  <servlet-name>myWeb</servlet-name>  <url-pattern>/</url-pattern> </servlet-mapping>