须要的包文件：
commons-fileupload-1.2.1.jar commons-io-1.3.2.jar commons-logging-1.1.jar freemarker-2.3.13.jar ognl-2.6.11.jar struts2-core-2.1.6.jar xwork-2.1.2.jar
Struts2Test.java源码：
package com.test;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class Struts2Test extends ActionSupport{
private String picFileName;
private File pic;
public File getPic() {
return pic;
}
public void setPic(File pic) {
this.pic = pic;
}
public String getPicFileName() {
return picFileName;
}
public void setPicFileName(String picFileName) {
this.picFileName = picFileName;
}
public String upload() throws IOException {
//输出的文件路径以及文件名称java.io.File.File(String parent, String child)
File upPic=new File(ServletActionContext.getServletContext().getRealPath("upload"),picFileName);
FileInputStream in=null;
FileOutputStream out=null;
//得到父类路径，假设不存在则创建
upPic.getParentFile().mkdirs();
in=new FileInputStream(pic); //读入文件
out=new FileOutputStream(upPic); //输出文件
int len=0; //数据长度
byte[] byt=new byte[1024]; //每次读入的数据包大小
while((len=in.read(byt))!=-1){ //假设有数据读入则输出
out.write(byt, 0, len);
}
in.close(); //关闭读入流
out.close(); //关闭输出流
return SUCCESS;
}
}struts.xml源码：
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <constant name="struts.devMode" value="true" /> <package name="default" extends="struts-default" namespace="/"> <action name="hello" class="com.test.Struts2Test" > <result name="success">/success.jsp</result> </action> </package> </struts>
web.xml源码：
<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <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>/*</url-pattern> </filter-mapping> </web-app>
index.jsp源码：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<s:form action="hello!upload" enctype="multipart/form-data" method="post">
<!-- enctype="multipart/form-data" 此处是一个非常easy忽略的盲点 -->
<s:file name="pic" label="上传" />
<s:submit value="提交"/>
</s:form>
</body>
</html>success.jsp源码：
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html>
<head>
<base href="<%=basePath%>">
<title>SUCCESS</title>
</head>
<body>
SUCCESS! <br>
</body>
</html>