spring webflow : 上传单个文件实例

来源：互联网发布：vod点播软件编辑：程序博客网时间：2024/06/12 20:10

准备

如果你项目中使用了spring security的话，参考上一篇文章，使用上篇的第二种方法，并去掉MultipartFilter（如果有配置的话），否则得不到文件
流程中的变量（如用var标签定义的变量），都需要实现Serializable接口。

实现过程

在pom.xml文件中加入下列依赖：

<!-- 支持文件上传 -->    <dependency>        <groupId>commons-fileupload</groupId>        <artifactId>commons-fileupload</artifactId>        <version>1.2.1</version>     </dependency>    <dependency>        <groupId>commons-io</groupId>        <artifactId>commons-io</artifactId>        <version>2.4</version>    </dependency>

在spring-servlet.xml(Spring MVC的配置文件)中加入文件上传解析器：

<!-- 文件上传解析器-->      <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">        <!-- one of the properties available; the maximum file size in bytes -->        <property name="maxUploadSize" value="10485760"/>    </bean>

实体类，记住要实现Serializable接口，属性类型是MultipartFile：

@Componentpublic class GoodsEntity implements Serializable{    private static final long serialVersionUID = 1L;    private MultipartFile images;     public MultipartFile getImages() {        return images;    }    public void setImages(MultipartFile images) {        this.images = images;    }}

流程定义代码，没什么特别的：

<?xml version="1.0" encoding="UTF-8"?><flow xmlns="http://www.springframework.org/schema/webflow"      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"      xsi:schemaLocation="http://www.springframework.org/schema/webflow                          http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd">         <var name="goods" class="com.huanle.model.entity.GoodsEntity"/>         <view-state id="viewfirst" view="/views/user/releasegoods/release_first.jsp" model="goods">           <transition on="submit" to="viewsecond"></transition>         </view-state>          <view-state id="viewsecond" view="/views/user/releasegoods/second.jsp" model="goods">           <transition on="submit" to="performReleaseGoodsAction"></transition>         </view-state>         <action-state id="performReleaseGoodsAction" >             <evaluate expression="goodsService.save(goods)"></evaluate>             <transition to="returntouserindex"></transition>         </action-state>         <end-state id="returntouserindex" view="/views/user/seller/index.jsp"></end-state>         <global-transitions>           <transition on="cancel" to="returntouserindex"></transition>         </global-transitions></flow>

上传表单代码，无需特别配置：

 <form:form action="${flowExecutionUrl}&_eventId=submit&${_csrf.parameterName}=${_csrf.token}" method="post" commandName="goods" enctype="multipart/form-data">                    <input type="hidden" name="_flowExecutionKey" value="${flowExecutionKey}"/>                  商品图片：<form:input id="images" path="images" type="file" multiple="multiple" />                 <input type="submit" >        </form:form>

就这样就可以了

参考文档

Handling File Uploads in webflow
Spring’s multipart (file upload) support in Spring MVC

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