前台form 表单：设置method=post,enctype=multipart/form-data。
struts2在原有的上传解析器继承上做了进一步封装，更进一步简化了文件上传。
action需要使用3个属性来封装该文件域的信息：
（1）类型为file的*属性封装了该文件域对应的文件内容；
（2）类型为string的***filename属性封装了该文件域对应的文件的文件类型；
（3）类型为string的***contenttype属性封装了该文件域对应的文件的类型。
具体实现：
新建web项目
添加struts2相关包
myeclipse可直接下载，右击项目，如下。
前台
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<%@ page language="java" import="java.util.*" pageencoding="utf-8"%>
<%
string path = request.getcontextpath();
string basepath = request.getscheme()+"://"+request.getservername()+":"+request.getserverport()+path+"/";
%>
<html>
<body>
<form action="upload.action" method="post" enctype="multipart/form-data">
<input type="file" name="upload" multiple="multiple"/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
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配置web.xml
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<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>uploadfile</display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.strutsprepareandexecutefilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
</web-app>
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配置struts.xml
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<?xml version="1.0" encoding="utf-8" ?>
<!doctype struts public "-//apache software foundation//dtd struts configuration 2.1//en" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<constant name="struts.enable.dynamicmethodinvocation" value="false"/>
<constant name="struts.devmode" value="true"/>
<constant name="struts.multipart.savedir" value="/tmp"/>
<constant name="struts.custom.i18n.resources" value="app"></constant>
<package name="default" namespace="/" extends="struts-default">
<action name="upload" class="com.yf.action.uploadaction">
<result>/index.jsp</result>
<interceptor-ref name="defaultstack"></interceptor-ref>
</action>
</package>
</struts>
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后台代码
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public class uploadaction extends actionsupport{
private list<file> upload;
private list<string> uploadcontenttype;
private list<string> uploadfilename;
public list<file> getupload() {
return upload;
}
public void setupload(list<file> upload) {
this.upload = upload;
}
public list<string> getuploadcontenttype() {
return uploadcontenttype;
}
public void setuploadcontenttype(list<string> uploadcontenttype) {
this.uploadcontenttype = uploadcontenttype;
}
public list<string> getuploadfilename() {
return uploadfilename;
}
public void setuploadfilename(list<string> uploadfilename) {
this.uploadfilename = uploadfilename;
}
@override
public string execute() throws exception {
//文件保存路径
string path = servletactioncontext.getservletcontext().getrealpath("/images");
file file = new file(path);
//不存在则创建
if(!file.exists()){
file.mkdir();
}
//循环将文件上传到指定路径
for(int i = 0; i< upload.size(); i++){
fileutils.copyfile(upload.get(i), new file(file,uploadfilename.get(i)));
}
return success;
}
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结果如下
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://blog.csdn.net/giving_bestself/article/details/77513177