SpringMvc (注解)中的上传文件

第一步：导入commons-fileupload-1.3.1.jar 和commons-io-2.2.jar 架包

第二步：在applicationContext.xml中 配置

<bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”/>

第三步：在页面 <form>标签添加属性enctype=”multipart/form-data” 这个是上传文件必须的

具体一个简单方法如下

1.web.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app version="3.0"
     xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
     http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
   <display-name></display-name>
   <welcome-file-list>
     <welcome-file>index.jsp</welcome-file>
   </welcome-file-list>

     <!-- 配置pringmvc前端控制器 -->
     <servlet>
           <servlet-name>dispatcherServlet</servlet-name>
           <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
       <!-- 设置springmvc的配置文件 -->
           <init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>/WEB-INF/shopping-servlet.xml</param-value>
           </init-param>
           <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
           <servlet-name>dispatcherServlet</servlet-name>
           <url-pattern>/</url-pattern>
    </servlet-mapping>
 </web-app>

2.shopping-servlet.xml

 <?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:p="http://www.springframework.org/schema/p"
     xmlns:context="http://www.springframework.org/schema/context"
     xsi:schemaLocation="
         http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd">

     <!-- 让spring容器自动探知bean   Controller    Service    Respoise   Componet -->
     <!--
     <bean class="org.springframework.web.portlet.mvc.annotation.DefaultAnnotationHandlerMapping"></bean>
      -->

     <context:component-scan base-package="com.bdqnsjz.shopping.controller"></context:component-scan>

     <bean id="multipartResolver"
           class="org.springframework.web.multipart.commons.CommonsMultipartResolver" p:maxUploadSize="34564356345456" p:maxUploadSizePerFile="3456435634545" p:defaultEncoding="utf-8">
           <!--
           <property name="defaultEncoding" value="utf-8"></property>
            -->
     </bean>

     <!-- 配置视图解析器 -->
     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
         <property name="prefix" value="/WEB-INF/pages/"></property>
         <property name="suffix" value=".jsp"></property>
     </bean>

 </beans>

3.controller

 @RequestMapping(value="/upload1", method=RequestMethod.POST)
     public String upload1(@RequestParam(value = "file", required = false) MultipartFile file,
             HttpServletRequest request){

         String fileName = file.getOriginalFilename();
         System.out.println(fileName);

         //获取扩展名
         String extension = fileName.substring(fileName.lastIndexOf("."));

         //新的文件名    234-135234532l34kjlkj.jpg
         String savedFileName = java.util.UUID.randomUUID().toString() + extension;

         String folderPath = request.getRealPath("/WEB-INF/upload");

         File savedFile = new File(folderPath, savedFileName);

         //保存文件
         try {
             file.transferTo(savedFile);
         } catch (IOException e) {
             e.printStackTrace();
         }

         return "upload1";
     }