java开发之spring webflow实现上传单个文件及多个文件功能实例

时间:2022-09-08 09:29:41

本文实例讲述了java开发之spring webflow实现上传单个文件及多个文件功能。分享给大家供大家参考,具体如下:

上传单个文件

准备

1. 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

2. 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:

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<!-- 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:

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<!-- 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:

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@Component
public 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:

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<?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:

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<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

上传多个文件

上传单个文件可在前面上传单个文件基础上稍作修改就可以实现了。

实现

首先,实体类要修改,使用List来存储多个文件:

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

上传表单也要修改:

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<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 path="images" type="file" multiple="multiple"/>
<input type="submit" value="提交">
</form:form>

增加一个multiple="multiple"属性即可。

希望本文所述对大家java程序设计有所帮助。

原文链接:http://blog.csdn.net/ruangong1203/article/details/51170385