<dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.3</version>
</dependency>

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 必须和用户JSP 的pageEncoding属性一致，以便正确解析表单的内容 -->
        <property name="defaultEncoding" value="UTF-8"></property>
        <!-- 文件最大大小(字节) 1024*1024*50=50M-->
        <property name="maxUploadSize" value="52428800"></property>
        <!--resolveLazily属性启用是为了推迟文件解析，以便捕获文件大小异常-->
        <property name="resolveLazily" value="true"/>
</bean>

<form action="/book/upload" method="post" enctype="multipart/form-data">
    请选择文件:<input type="file" name="xxx"/>
    <input type="submit" value="ok">

</form>

    /**
     * springmvc文件上传
     * @param xxx
     * @return red
     */
    @RequestMapping("/upload")
    public String upload(HttpServletRequest req,MultipartFile xxx){
        String fileName=xxx.getOriginalFilename();
        String contentype=xxx.getContentType();
        try {
            FileUtils.copyInputStreamToFile(xxx.getInputStream(),new File("E:/T226/SSM/src/main/webapp/static/images/"+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return  "redirect:/book/list";
    }