Springmvc实现文件上传

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc.xsd
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd">
  <!--包扫描-->
  <context:component-scan base-package="cn.itcast"></context:component-scan>
  <!--配置multipartResolver,注意:id名称固定为multipartResolver-->
  <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

  </bean>

  <mvc:annotation-driven ></mvc:annotation-driven>
  
  <!--让静态资源不经过过滤器-->
  <mvc:resources mapping="/js/**" location="/js/"></mvc:resources>

  <!--视图解析器给controller中返回的逻辑视图名加上前缀和后缀-->
  <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/pages/"></property>
    <property name="suffix" value=".jsp"></property>
  </bean>
</beans>

<form action="/test/file" method="post" enctype="multipart/form-data">
    上传的文件:<input type="file" name="upload"><br/>
    密钥:<input type="text" name="password"><br/>
    <input type="submit" value="提交">
 </form>

@Controller
@RequestMapping("/test")
public class FileUploadController {
  @RequestMapping("/file")
  public String testFileUpload(HttpServletRequest request, MultipartFile upload) throws IOException { 
     //upload是表单中文件name属性值,必须保持一致
    System.out.println("testFileUpload...");
    String realPath = request.getSession().getServletContext().getRealPath("/uploads");
    File file = new File(realPath);
    if(!file.exists()){
      file.mkdirs();//创建文件夹
    }
    String filename = upload.getOriginalFilename(); //获取文件名
    String name = upload.getName();//获取表单中的name属性值 即upload

    String uuid = UUID.randomUUID().toString().replaceAll("-", "");//生成uuid避免文件名重复导致冲突覆盖
    filename=uuid+"_"+filename;
    upload.transferTo(new File(file,filename));
    return "forward:success.jsp";
}