在上章节Struts2 文件上传示例, 用户允许选择一个文件并上传到服务器。在本教程中，您将学习如何允许用户将多个文件上传到服务器。
这里创建一个Web工程：strut2uploadfiles，来演示在多个复选框如何设置的默认值，整个项目的结构如下图所示：
1. 动作类
在Action类，可以使用列表或数组以存储上传的文件。
FileUploadAction.java
package com.xuhuhu.common.action;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import com.opensymphony.xwork2.ActionSupport;
public class MultipleFileUploadAction extends ActionSupport{
private List<File> fileUpload = new ArrayList<File>();
private List<String> fileUploadContentType = new ArrayList<String>();
private List<String> fileUploadFileName = new ArrayList<String>();
public List<File> getFileUpload() {
return fileUpload;
}
public void setFileUpload(List<File> fileUpload) {
this.fileUpload = fileUpload;
}
public List<String> getFileUploadContentType() {
return fileUploadContentType;
}
public void setFileUploadContentType(List<String> fileUploadContentType) {
this.fileUploadContentType = fileUploadContentType;
}
public List<String> getFileUploadFileName() {
return fileUploadFileName;
}
public void setFileUploadFileName(List<String> fileUploadFileName) {
this.fileUploadFileName = fileUploadFileName;
}
public String upload() throws Exception{
for (File file: fileUpload) {
System.out.println("File :" + file);
}
for (String fileName: fileUploadFileName) {
System.out.println("Filename : " + fileName);
}
for (String fileContentType: fileUploadContentType) {
System.out.println("File type : " + fileContentType);
}
return SUCCESS;
}
public String display() {
return NONE;
}
}
2. 结果页面
使用<s:file>标签来渲染多文件上传组件，并设置表单 enctype类型为“multipart/form-data”.
fileupload.jsp
<%@ taglib prefix="s" uri="/struts-tags" %> <html> <head> <s:head /> </head> <body> <h1>Struts2上传多个文件示例</h1> <s:form action="resultAction" namespace="/" method="POST" enctype="multipart/form-data"> <s:file label="File 1" name="fileUpload" size="40" /> <s:file label="File 2" name="fileUpload" size="40" /> <s:file label="FIle 2" name="fileUpload" size="40" /> <s:submit value="submit" name="submit" /> </s:form> </body> </html>
result.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<body>
<h1>Struts2上传多个文件示例</h1>
<div><div class="ads-in-post hide_if_width_less_800">
<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
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data-ad-client="ca-pub-2836379775501347"
data-ad-slot="3642936086"
data-ad-region="zaixianregion"></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>
</div></div><h2>
File Name : <s:property value="fileUploadFileName"/>
</h2>
<h2>
Content Type : <s:property value="fileUploadContentType"/>
</h2>
<h2>
File : <s:property value="fileUpload"/>
</h2>
</body>
</html>
3. struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.devMode" value="true" />
<package name="default" namespace="/" extends="struts-default">
<action name="multipleFileUploadAction"
class="com.xuhuhu.common.action.MultipleFileUploadAction"
method="display">
<result name="none">pages/multiplefileupload.jsp</result>
</action>
<action name="resultAction"
class="com.xuhuhu.common.action.MultipleFileUploadAction"
method="upload">
<result name="success">pages/result.jsp</result>
</action>
</package>
</struts>
4. 示例
http://localhost:8080/struts2uploafiles/multipleFileUploadAction.action
参考
- Struts2文件上传示例
- Struts2文件上传文档
- http://struts.apache.org/2.0.14/docs/file-upload.html
- http://struts.apache.org/2.0.14/docs/how-do-we-upload-files.html
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Struts2文件上传例子
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Struts2 <s:doubleselect>示例