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";
    }