本文主要是介绍swfupload + commons-fileupload实现文件批量上传，带百分比进度条，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
swfupload是一个操纵flash上传文件的javascript库，提供客户端实现，官网：http://code.google.com/p/swfupload/
fileupload是文件上传的服务器端实现，官网：http://commons.apache.org/fileupload/
本文的环境是在eclipse中配置好本机上的tomcat7上实现。具体细节参见源代码。
有几处加以说明：
1> 这里的实现是在点击"upload"选择文件以后自动上传，如果想自己控制上传，可以将handlers.js中的this.startUpload注释掉，同时在index.jsp中初始化SWFupload的custom_settings中加一个类似于cancelButtonId的startButton按钮，然后在下面html里增加一个相对应的startButton,并且οnclick="upload.startUpload();" 这样可以通过点击这个按钮来实现文件上传。
2> 原有的上传进度条是没有百分比的，其设置在handlers.js中的uploadProgress函数中，修改Line 130为progress.setStatus("Uploading...("+percent+" %)");
3> swfupload在firefox等有些浏览器中无法带上session,因此如果页面需要带有session信息，那么只能手动指定，可以在index.jsp中先得到sessionID: <% String sessionID = session.getId(); System.out.println("session is:" + sessionID); %> ，然后在js中调用：
upload_url: "<%=request.getContextPath()%>/upload.jsp;jsessionid=" + '<%=sessionID%>',
4> 参数传递：如果index.jsp在提交页面的时候希望传递一些参数，比如sbmtForm=myForm，那么可以：
post_params: { "sbmtForm": 'myForm' },
use_query_string : true,
源码：http://download.csdn.net/detail/sundongsdu/4642497
两个主要文件列此：
index.jsp
<%@ page contentType="text/html;charset=utf-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>SWFUpload Demos - External Interface Demo</title>
<% String sessionID = session.getId(); System.out.println("session is:" + sessionID); %>
<link href="swfupload/default.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="swfupload/swfupload.js"></script>
<script type="text/javascript" src="swfupload/fileprogress.js"></script>
<script type="text/javascript" src="swfupload/handlers.js"></script>
<script type="text/javascript">var upload;window.onload = function() {var settings = {flash_url : "<%=request.getContextPath()%>/swfupload/swfupload.swf",upload_url: "<%=request.getContextPath()%>/upload.jsp;jsessionid=" + '<%=sessionID%>', post_params: { "sbmtForm": 'myForm' }, use_query_string : true,file_size_limit : "100 MB",file_types : "*.*",file_types_description : "All Files",file_upload_limit : 10,file_queue_limit : 0,custom_settings : {progressTarget : "fsUploadProgress",cancelButtonId : "btnCancel",
// startButton:"startButton",percentage:"percentage"},debug: false,// Button Settingsbutton_image_url : "<%=request.getContextPath()%>/swfupload/XPButtonUploadText_61x22.png", // Relative to the SWF filebutton_placeholder_id : "spanButtonPlaceHolder",button_width: 61,button_height: 22,// The event handler functions are defined in handlers.jsfile_dialog_start_handler : fileDialogStart,file_queued_handler : fileQueued,file_queue_error_handler : fileQueueError,file_dialog_complete_handler : fileDialogComplete,upload_start_handler : uploadStart,upload_progress_handler : uploadProgress,upload_error_handler : uploadError,upload_success_handler : uploadSuccess,upload_complete_handler : uploadComplete};upload = new SWFUpload(settings);};
</script>
</head>
<body><div id="content"><form id="form1" method="post" enctype="multipart/form-data"><div class="fieldset flash" id="fsUploadProgress"><span class="legend">Upload Queue</span></div><div style="padding-left: 5px;"><span id="spanButtonPlaceHolder"></span><input id="btnCancel" type="button" value="Cancel" οnclick="cancelQueue(upload);" disabled="disabled" style="margin-left: 2px; height: 22px; font-size: 8pt;"/></div> </form>
</div>
</body>
</html>
upload.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<%@ page import="org.apache.commons.fileupload.servlet.*" %>
<%@ page import="org.apache.commons.fileupload.*" %>
<%@ page import="org.apache.commons.fileupload.disk.*" %>
<%@ page import="org.apache.commons.io.*" %>
<%@ page import="java.util.*" %>
<%@ page import="java.io.*" %>
<%if (ServletFileUpload.isMultipartContent(request)){try {DiskFileItemFactory factory = new DiskFileItemFactory();factory.setSizeThreshold(1024*400); File tmpFile = new File(this.getServletContext().getRealPath("/") + "WEB-INF/tmpfile");if (!tmpFile.exists())FileUtils.forceMkdir(tmpFile);factory.setRepository(tmpFile);ServletFileUpload u = new ServletFileUpload(factory);u.setHeaderEncoding("utf-8");u.setSizeMax(1024*1024*400);String uploadPath = this.getServletContext().getRealPath("/") + "WEB-INF/uploadfile";File f = new File(uploadPath);if (!f.exists())FileUtils.forceMkdir(f);List list = u.parseRequest(request);Iterator it = list.iterator();FileItem item = null;while (it.hasNext()) {item = (FileItem) it.next();if (!item.isFormField()) {String filename = uploadPath + "/" + item.getName();item.write(new File(filename));}} }catch (Exception e){e.printStackTrace();}}
%>
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