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 >
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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 >
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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;
}
}
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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 >
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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 >
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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;
}
}
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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>
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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