原文链接如下：
http://stackoverflow.com/questions/7672768/plupload-dynamically-change-url
个人项目代码：
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<c:set var="sysPath" value="${pageContext.request.contextPath}"/>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>上传文件</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link href="${sysPath}/themes/default/style/DateService.css" target="_blank" rel="external nofollow" rel="stylesheet" type="text/css" />
<link href="${sysPath}/js/jquery-ui-1.8.12.custom/css/redmond/jquery-ui-1.8.12.custom.css" target="_blank" rel="external nofollow" rel="stylesheet" type="text/css">
<link rel="stylesheet" type="text/css" href="${sysPath}/js/jnotify/jquery/jNotify.jquery.css" target="_blank" rel="external nofollow" >
<style type="text/css">@import url(${sysPath}/js/plupload/js/jquery.plupload.queue/css/jquery.plupload.queue.css);</style>
<script src="${sysPath}/js/common.js"></script>
<script src="${sysPath}/js/jquery-1.6.min.js"></script>
<script type="text/javascript" src="${sysPath}/js/plupload/js/plupload.full.js"></script>
<script type="text/javascript" src="${sysPath}/js/plupload/js/jquery.plupload.queue/jquery.plupload.queue.js"></script>
<script type="text/javascript" src="${sysPath}/js/plupload/js/i18n/zh_CN.js"></script>
<script type="text/javascript" src="${sysPath}/js/png.js"></script>
<script type="text/javascript" src="${sysPath}/js/divBtn.js"></script>
<script type="text/javascript" src="${sysPath}/js/tableCss.js"></script>
<script type="text/javascript">
//上传插件初始化
// Convert divs to queue widgets when the DOM is ready
$(function() {
var filters = [],upload_size ;
$.ajax({
url:"${sysPath}/page/externalshare/listFileAudit.action",
async:false,
type:"post",
success:function(data){
if(data.datasList.length>0){
var datas = data.datasList;
upload_size = data.upload_size;
for(var i=0;i<datas.length;i++){
filters[i]= {title:setOptionTxt(datas[i].filetype),extensions:datas[i].extension};
}
}
}
});
$("#uploader").pluploadQueue({
// General settings
runtimes : 'gears,flash,silverlight,browserplus,html5,html4',
//url : '${sysPath}/page/externalshare/FileUpload.action?userId='+$("#userId").val(),
url : '${sysPath}/page/externalshare/FileUpload.action',
max_file_size : upload_size+'mb',
unique_names : true,
chunk_size: '2mb',
// Specify what files to browse for
filters : filters,
flash_swf_url : '${sysPath}/js/plupload/js/plupload.flash.swf',
// Silverlight settings
silverlight_xap_url : '${sysPath}/js/plupload/js/plupload.silverlight.xap'
});
//新增动态改变url地址start
var uploader = $('#uploader').pluploadQueue();
uploader.bind('BeforeUpload', function(uploader, filters) {
uploader.settings.url = uploader.settings.url+'?userId='+$("#userId").val();
}
);
//新增动态改变url地址end
$('form').submit(function(e) {
if (uploader.files.length > 0) {
// When all files are uploaded submit form
uploader.bind('StateChanged', function() {
if (uploader.files.length === (uploader.total.uploaded + uploader.total.failed)) {
$('form')[0].submit();
}
});
uploader.start();
} else {
alert('请先上传数据文件.');
}
return false;
});
});
function setOptionTxt(option){
var txt = "";
switch(option)
{
case 'image':
txt = '图片';
break;
case 'video':
txt = '视频';
break;
case 'music':
txt = '音乐';
break;
case 'zip':
txt = '压缩文件';
break;
case 'document':
txt = '文档';
break;
default:
txt = '';
}
return txt;
}
</script>
</head>
<body>
<div id="msgBox" title="错误告警" style="display: none;">
<table>
<tr>
<td rowspan="2" scope="row" style="width:80px">
<img id="alertMsg" src="${sysPath}/themes/default/images/important.gif">
</td>
<td align="left">
<div id="msgShow" style="font-size:15px;text-align:left；margin-top:20px"></div>
</td>
</tr>
<tr>
<td align="left">
<div id="showMore" style="float:left;width:54px;height:21px;line-height:21px;text-align:center;margin-top:20px;background:url(${sysPath}/themes/default/images/right_title_bnt.gif) no-repeat left top;display: inline;" οnclick="showMsgMore()">查看详情</div>
</td>
</tr>
<tr>
<td colspan="2" scope="row">
<div id="msgMoreShow" style="display: none;float:left;text-align:left；margin-top:20px"></div>
</td>
</tr>
</table>
</div>
<div class="right">
<div class="right_title">
<span>
<div οnclick="add();" class="divBtn">
<a href="${sysPath}/page/externalshare/toUploadEShare.action" target="_blank" rel="external nofollow" >继续上传</a>
</div>
文件共享 > 文件上传
</span>
</div>
<div class="right_edit" style="height:90%; overflow-y:auto;">
<form id="formId" action="${sysPath}/page/externalshare/Submit.action" method="post">
<table>
<tr bgcolor="#FFFFFF">
<td class="title_column" style="text-align: left;">
<font color="#CD6600">*业务类型：</font>
<select name="businessType">
<option value="1">业务类型1</option>
<option value="2">业务类型2</option>
<option value="3">业务类型3</option>
</select>
</td>
<td class="title_column" style="text-align: left;">
<font color="#CD6600">*指定用户：</font>
<select name="userId" id="userId">
<c:forEach items='${userInfoList}' var ='list'>
<option value="${list.id}">${list.name}</option>
</c:forEach>
</select>
</td>
</tr>
<tr>
<td align="left">
<div style="text-align:left;float:left;">
<div style="width: 750px; margin: 0px auto">
<div id="uploader">
<p>您的浏览器未安装 Flash, Silverlight, Gears, BrowserPlus 或者支持 HTML5 .</p>
</div>
<!--
<input type="submit" value="完成"/>
-->
</div>
</div>
</td>
</tr>
</table>
</form>
</div>
</div>
</form>
</body>
</html>
在代码中新增的部分是完成需要的代码。如果没有添加的话，那么将不能动态的获得userId。至于一些js和整体的demo，我有时间了会传完整版的上来。这里只是项目中的一个页面。
http://www.plupload.com/examples/events 另外附带api
![实现计算器功能[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)