Struts2上传多个文件例子

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2023-03-14

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.yiibai.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>
<!-- 728x90 - After2ndH4 -->
<ins class="adsbygoogle hide_if_width_less_800" 
     
     data-ad-client="ca-pub-2836379775501347"
     data-ad-slot="3642936086"
	 data-ad-region="yiibairegion"></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.yiibai.common.action.MultipleFileUploadAction" 
            method="display">
		<result name="none">pages/multiplefileupload.jsp</result>
	</action>
		
	<action name="resultAction" 
	     class="com.yiibai.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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