SpringMVC处理multipart请求的示例代码

    @Bean(name = "multipartResolver")
    public StandardServletMultipartResolver getStandardServletMultipartResolver(){
        return new StandardServletMultipartResolver();
    }

 <servlet>
  <servlet-name>dispatcherServlet</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
  <multipart-config>
    <!--上传到/tmp/upload 目录-->
   <location>/tmp/upload</location>
    <!--文件大小为2M-->
   <max-file-size>2097152</max-file-size>
    <!--整个请求不超过4M-->
   <max-request-size>4194304</max-request-size>
    <!--所有文件都要写入磁盘-->
   <file-size-threshold>0</file-size-threshold>
  </multipart-config>
 </servlet>
 <servlet-mapping>
  <servlet-name>dispatcherServlet</servlet-name>
  <url-pattern>/</url-pattern>
 </servlet-mapping>

  @Override
  protected void customizeRegistration(ServletRegistration.Dynamic registration) {
    //上传到/tmp/upload 目录，文件大小为2M，整个请求不超过4M，而且所有文件都要写入磁盘
    registration.setMultipartConfig(new MultipartConfigElement("E:\\upload_ftp",2097152,4194304,0));
  }

  <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!--设置上传目录/tmp/upload;最大的文件容量设置为2M;最大的内存大小设置为0，表示所有文件都会写入磁盘中;无法设定multipart请求整体的最大容量-->
    <property name="uploadTempDir" value="/tmp/upload"/>
    <property name="maxUploadSize" value="2097152"/>
    <property name="maxInMemorySize" value="0"/>
  </bean>

   <form action="/picture" method="post" enctype="multipart/form-data">
     <input type="file" name="picture">
     <input type="submit">
   </form>

  @RequestMapping(value = "/picture",method = RequestMethod.POST)
  public String getHome(@RequestPart("picture") MultipartFile picture) throws IOException {
    String name = picture.getName();
    byte[] bytes = picture.getBytes();
    picture.transferTo(new File("/"+picture.getOriginalFilename())); 
    //这里保存到文件系统的时候要用相对路径，比如这里配置的是 /。以配置的上传目录为基准。即文件路径 E:/upload_ftp/ 是保存的目录
    return "home";
  }

  @RequestMapping(value = "/picture",method = RequestMethod.POST)
  public String getHome(@RequestPart("picture") Part picture) throws IOException {
    picture.write("/"+picture.getSubmittedFileName());
    return "home";
  }