步骤一： 到官网上下载uploadify的JS文件.
Uploadify在线演示：在线Demo
Uploadify配置参数及接口文档：http://www.uploadify.com/documentation
Uploadify插件下载地址：http://www.uploadify.com/download
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步骤二：下载好uploadify压缩包文件后，解压文件包。在文件夹中找到以下五个文件，并添加到项目的对应路径中：
jquery.uploadify.v2.1.0.js
swfobject.js
uploadify.swf
uploadify.css
cancel.png
步骤三：加入struts2的jar包、struts.xml ，在web.xml中加入struts2的FilterDispatcher过滤器。
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1、jsp代码：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<link href="css/default.css" rel="stylesheet" type="text/css" />
<link href="css/uploadify.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
<script type="text/javascript" src="js/swfobject.js"></script>
<script type="text/javascript" src="js/jquery.uploadify.v2.1.0.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#uploadify").uploadify({
'uploader' : 'uploadify.swf', //是组件自带的flash，用于打开选取本地文件的按钮
'script' : 'uploadAction!uploadFile.action',//处理上传的路径，这里使用Struts2是XXX.action
'cancelImg' : 'image/cancel.png',//取消上传文件的按钮图片，就是个叉叉
'folder' : 'uploads',//上传文件的目录
'fileDataName' : 'uploadify',//和input的name属性值保持一致就好，Struts2就能处理了
'queueID' : 'fileQueue',
'auto' : false,//是否选取文件后自动上传
'multi' : true,//是否支持多文件上传
'simUploadLimit' : 2,//每次最大上传文件数
'buttonText' : 'BROWSE',//按钮上的文字
'displayData' : 'speed',//有speed和percentage两种，一个显示速度，一个显示完成百分比
'fileDesc' : '支持格式:jpg/gif/jpeg/png/bmp.', //如果配置了以下的'fileExt'属性，那么这个属性是必须的
'fileExt' : '*.jpg;*.gif;*.jpeg;*.png;*.bmp',//允许的格式
'onComplete' : function (event, queueID, fileObj, response, data){
$("#result").html(response);//显示上传成功结果
setInterval("showResult()",2000);//两秒后删除显示的上传成功结果
}
});
});
function showResult(){//删除显示的上传成功结果
$("#result").html("");
}
function uploadFile(){//上传文件
jQuery('#uploadify').uploadifyUpload();
}
function clearFile(){(){//清空所有上传队列
jQuery('#uploadify').uploadifyClearQueue();
}
</script>
</head>
<body>
<div id="fileQueue"></div>
<input type="file" name="uploadify" id="uploadify" />
<p>
<a href="javascript:uploadFile()">开始上传</a>
<a href="javascript:clearFile()">取消所有上传</a>
</p>
<div id="result"></div><!--显示结果-->
</body>
</html>
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2、web.xml
<filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
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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>
<package name="struts2" extends="struts-default">
<action name="uploadAction" class="com.lijigou.action.UploadAction" method="uploadFile">
</action>
</package>
</struts>
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4、action代码
package com.lijigou.action;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class UploadAction extends ActionSupport {
private File uploadify;
private String uploadifyFileName;
@SuppressWarnings("deprecation")
public String uploadFile() throws Exception {
String extName = "";//扩展名
String newFileName= "";//新文件名
String nowTime = new SimpleDateFormat("yyyymmddHHmmss").format(new Date());//当前时间
String savePath = ServletActionContext.getRequest().getRealPath("");
savePath = savePath +"/uploads/";
HttpServletResponse response = ServletActionContext.getResponse();
response.setCharacterEncoding("utf-8");
//获取扩展名
if(uploadifyFileName.lastIndexOf(".")>=0){
extName = uploadifyFileName.substring(uploadifyFileName.lastIndexOf("."));
}
newFileName = nowTime+extName;
uploadify.renameTo(new File(savePath+newFileName));
response.getWriter().print(uploadifyFileName+"上传成功");
return null; //这里不需要页面转向，所以返回空就可以了
}
public File getUploadify() {
return uploadify;
}
public void setUploadify(File uploadify) {
this.uploadify = uploadify;
}
public String getUploadifyFileName() {
return uploadifyFileName;
}
public void setUploadifyFileName(String uploadifyFileName) {
this.uploadifyFileName = uploadifyFileName;
}
}
以上代码都通过测试，没有问题的。